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EEVblog #776 - World's Smallest Digital Dosimeter
« on: August 05, 2015, 01:00:56 am »
A look at the Ultra Micron, the world's smallest digital ionising radiation dosimeter, and it's Open Source Hardware.
https://github.com/shodanx/ultramicron

 

Offline alimirjamali

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #1 on: August 05, 2015, 01:39:38 am »
I wish if Andrey sold this device.  :( He did an excellent job

The Windows software is available on his Github repository which is written in Delphi. Should be very easy to translate to English.

Thank you very much Dave for review and tear-down  :-+
 

Offline nitro2k01

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #2 on: August 05, 2015, 03:19:50 am »
What I want to know is how well it can tolerate higher radioation levels, in terms of not crashing and so on. Do rad hardened micros come in such small packages?
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Offline sergey

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #3 on: August 05, 2015, 04:41:25 am »
Very nice, Andrey! :)

Dave, uR/h is rather quite common in russia actually, so not a problem here at all :) And thanks for the teardown!
 

Offline Artlav

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #4 on: August 05, 2015, 05:33:46 am »
Tried to translate the software, but it won't compile for me. Needs some post-7 (and so braindead) version of Delphi.
So i only translated the screenshots:



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Offline dadler

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #5 on: August 05, 2015, 08:54:50 am »
I really want one of these!
 

Offline shodan@micron

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #6 on: August 05, 2015, 09:00:25 am »
it project also have monitoring web service!!!
maps
station graphs

Yes is of course Russian language, because this project not to advertise to other country until today. Some Ultra-Micron's register on it, and send data to web frequently.... some not...
If someone assembling dosimeter, i started adapt language.

If somebody have one dosimeter, build it, for yourself!

In YouTube comments people tell me about start mass production, but i do not like commerce. This is my hobby!

If you have question you can write it to my conctact page (Google translate is trash :) ) or ask on this forum but is slower.
« Last Edit: August 05, 2015, 09:18:38 am by shodan@micron »
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Offline LabSpokane

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #7 on: August 05, 2015, 09:15:03 am »
Wow!  I thought I had seen a small dosimeter until now.  It'll be interesting to see what shows up in the nuclear pavilions at the power trade shows with this new benchmark.
 

Offline shodan@micron

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #8 on: August 05, 2015, 09:26:28 am »
What I want to know is how well it can tolerate higher radioation levels, in terms of not crashing and so on.

I've tested it to 800 000 uR/h. (more 40 000 times of normal background radiation)
More radiation level cant use for me.

Theoretically it can success measured up to 1 000 000+ uR/h
« Last Edit: August 05, 2015, 09:36:10 am by shodan@micron »
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Offline Stonent

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #9 on: August 05, 2015, 09:28:26 am »
Datasheet for the SBM-10 http://www.gstube.com/data/2396/

More info about Soviet surplus tubes: https://sites.google.com/site/diygeigercounter/gm-tubes-supported

The SBM-10 is not particularly sensitive tube, but it is small.

If you remove the inside of the smoke detector from the housing, you can get a lot more activity from the Americium.

Another interesting thing to test is Potassium Chloride, sold as "Lite salt" or sodium free salt.  Potassium and Potassium chloride typically contain enough K-40 in it that it will increase your activity by several ticks per minute.  It's not dangerous, it's just that's the way Potassium exists in nature.

Another thing to keep in mind is dosage is highly dependent on the material being tested.  A geiger tube is only a counter. It has no ability to measure magnitude.   As far as it is concerned, one click of Potassium 40 is the same as one click of Plutonium.  So the meter has to be calibrated to the sample.   You could think of it as a device that counts cars passing by on the road. A Smart car is the same as a 18 wheeled diesel truck.  Typically counters are calibrated to CS-137 or in the case of the CDV-700 counter I have, calibrated to depleted uranium.

If you did want to measure magnitude of unknown samples, you'd need a scintillation counter.

So if you are measuring to anything other than it is calibrated to, make sure if you know what you're measuring, do some googling and see how you can covert counts to sieverts for your sample.

And remember, half-lives have to do with how much radiation is spewing out.  Short half-lives mean lots of radiation, long half-lives mean slow emissions.
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Offline jnissen

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #10 on: August 05, 2015, 10:04:33 am »
Dave, if your interested you may be able to interface the dossimeter into a world map. I am using the following service as it's free and the guys here support many different devices. Perhaps they can support your meter? Give them a try.

http://radmon.org/
 

Offline elektronaut

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #11 on: August 05, 2015, 11:55:49 am »
That's a really nice dosimeter.
Can this one be used in an environment where one is prone to be exposed to X-rays?
In other words in situations where the exposure is very short but somewhat intense.
 

Offline Someone

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #12 on: August 05, 2015, 12:04:47 pm »
Argh, never heard anyone pronounce it that way before. The manufacturers videos and professionals I have worked with always pronounced it "dose-im-eter" emphasis on its function of estimating dose.
That's a really nice dosimeter.
Can this one be used in an environment where one is prone to be exposed to X-rays?
In other words in situations where the exposure is very short but somewhat intense.
The detector used in this small unit is sensitive almost exclusively to gamma radiation, it would be a very poor choice as a general purpose dosimeter or for use with narrow energy emitters such as x-ray equipment. They are intended for consumers worried about nuclear hazards.
 

Offline Pentium100

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #13 on: August 05, 2015, 01:16:52 pm »
I noticed one mistake in the display. The dosimeter displays uR/h current level, but then the day dose is in uRh. Why? Roentgen is a measure of dose, you do not need to multiply it by hours. For example, joules - you can measure power in J/h, but won't measure the total energy in Jh.

I know this is pedantic, but for some reason I really notice this kind of mistake. For example, saying that a lightbulb uses 100W/h.
 

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #14 on: August 05, 2015, 01:50:56 pm »
Hi Folks,

MegaNubie question/request: Can someone point me in the right direction to cut-my-teeth on understanding GitHub?

I'm opening and looking at files and it's a bit of a train-wreck in my brain.

Cheers,
Mark
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Offline elektronaut

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #15 on: August 05, 2015, 02:00:23 pm »
Can someone point me in the right direction to cut-my-teeth on understanding GitHub?
I'm opening and looking at files and it's a bit of a train-wreck in my brain.

In the readme.md file this links shows up ftp://www.xn--80aighkbzclf7a.net/%D0%94%D0%BE%D0%B7%D0%B8%D0%BC%D0%B5%D1%82%D1%80%D1%8B_%D0%9C%D0%B8%D0%BA%D1%80%D0%BE%D0%BD/%D0%A3%D0%BB%D1%8C%D1%82%D1%80%D0%B0-%D0%BC%D0%B8%D0%BA%D1%80%D0%BE%D0%BD/ here you can download all files in a simple way
 

Offline 99tito99

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #16 on: August 05, 2015, 03:02:36 pm »
Can someone point me in the right direction to cut-my-teeth on understanding GitHub?
I'm opening and looking at files and it's a bit of a train-wreck in my brain.

In the readme.md file this links shows up ftp://www.xn--80aighkbzclf7a.net/%D0%94%D0%BE%D0%B7%D0%B8%D0%BC%D0%B5%D1%82%D1%80%D1%8B_%D0%9C%D0%B8%D0%BA%D1%80%D0%BE%D0%BD/%D0%A3%D0%BB%D1%8C%D1%82%D1%80%D0%B0-%D0%BC%D0%B8%D0%BA%D1%80%D0%BE%D0%BD/ here you can download all files in a simple way

Hi elektronaut:

Thanks, that focused me in and helps a lot.

Cheers,
Mark
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Offline shodan@micron

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #17 on: August 05, 2015, 03:31:53 pm »
but then the day dose is in uRh. Why?

Yes, you are right! This error i add then change firmware language. In original stuff it looks right.  Thanks, i fix it!
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Offline TiN

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #18 on: August 05, 2015, 10:19:51 pm »
Nice piece of russian engineering :)

And meanwhile, EEVBlog not supporting russian language posts!?

P.S. ??????? ??????, :) Nah, not supporting, changes posts/PMs to bunch of questions marks. ??? :)
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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #19 on: August 06, 2015, 12:34:43 am »
Hi

Since it's open source hardeware where can I find the pcb files ?
I could not find them in the github folder, did I overlook something ?
I would love to build one.

Cheers
Michael

EDIT
Please excuse, after removing the tomatoes from my eyes I found the pcb files and ordered them from osh park.
8$ for three pcbs, awesome!

« Last Edit: August 06, 2015, 12:40:06 am by Rubi »
 

Offline bitwelder

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #20 on: August 06, 2015, 03:07:54 am »
Hats off to Andrei for making this little beauty!  :-+

Besides, looking at the files in www.xn--80aighkbzclf7a.net I see that before Ultra-Micron there was a Micron project, running several versions, with older versions dating back to 2012.
So the device we saw in Dave's hands is likely the result of a long evolution process.

Thanks also for releasing it as open source.
 

Offline LabSpokane

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #21 on: August 06, 2015, 03:16:00 am »
Shodan,

I forgot to thank you.  Projects like this are what make it fun to visit here.  Nice work!!
 

Offline SEKCobra

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #22 on: August 06, 2015, 04:06:57 am »
Man, I'd love this as a kit, maybe a bit more rugged case (Like Honeywell CO Warners maybe?).
 

Offline shodan@micron

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #23 on: August 06, 2015, 06:03:18 am »
Please excuse, after removing the tomatoes from my eyes I found the pcb files and ordered them from osh park.
I recommend use Seeedstudio, because it have better "Annular Ring" PCB limitations.

bit more rugged case
This case(from Dave video), the best and small what i can found.
Key thing it is small.
As one option to order the plastic case molding in the factory, but it is very expensive.

I thanks to everyone!
I was interested to read the comments.
Glad that you liked the project.

No, i not sell "kit".
But if you can find more 60% components yourself, maybe i can help you.... i can send to you rare components by mail.

Sometimes i sell 1-3 pieces(fully assembled device), but it very expensive price. Therefore i recommend bying components and assembly it yourself, it more cheaper.
« Last Edit: August 06, 2015, 06:29:18 am by shodan@micron »
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Offline Stonent

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #24 on: August 06, 2015, 09:30:33 am »
Please excuse, after removing the tomatoes from my eyes I found the pcb files and ordered them from osh park.
I recommend use Seeedstudio, because it have better "Annular Ring" PCB limitations.

bit more rugged case
This case(from Dave video), the best and small what i can found.
Key thing it is small.
As one option to order the plastic case molding in the factory, but it is very expensive.

I thanks to everyone!
I was interested to read the comments.
Glad that you liked the project.

No, i not sell "kit".
But if you can find more 60% components yourself, maybe i can help you.... i can send to you rare components by mail.

Sometimes i sell 1-3 pieces(fully assembled device), but it very expensive price. Therefore i recommend bying components and assembly it yourself, it more cheaper.

Well one thing I like is if you have the full schematic, you can modify it as needed.
For instance building the HV section and then being able to sample the voltage would be what I would be most interested in.  As long as I can get pulses from that, I could use another MCU if I'm more comfortable with it.
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Offline dmg

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #25 on: August 06, 2015, 11:06:08 am »
Well, I'm building one or two of these I'm amazed of the PSU design, very nicely done. I've already ordered all the components. For your reference on things I've found difficult to get:

I'm 99% sure that these are the cases:
http://www.aliexpress.com/item/plastic-case-small-6-pcs-49-27-18mm-electronic-project-box-electronic-case-abs-swith-housing/32219511996.html
It has the exact inside dimensions and looks very similar on the outside.

This is the only source I've found for screens:
http://www.aliexpress.com/item/Original-LCD-screen-digitizer-display-Second-External-LCD-For-Nokia-2760-Mobile-Phone-Repair-replacement-Tools/1822978844.html

As for the vibration motors the ebay seller listed on the motor parameters ( ebay store 4hobbyde) seems not to be carrying them, but no worries, I'm 99% sure they are these:
http://www.ebay.com/itm/231218458556?_trksid=p2060353.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

SBM-10 tubes are readily available on ebay from lots of sellers, no problem there.


As for the rest of the electronic components all of them are readily available on digikey and mouser. Well, there are no matching tactile switches on mouser but those can be found on ebay for dirt cheap (the model listed on the BOM is from a russian store but it's standard. So is the orange LED, any 1206 orange led will do). It gets cheaper on mouser. Only things I've found are that:

- ATB322515-0110 transformers are out of stock everywhere until september 2015, but you can get ATB322524-0110 which seems to be fully compatible, just a bit taller (same series, same datasheet, higher current rating)

-ABM7-8.000MHZ-D2Y-T has a unique footprint and there are literally no other crystals on that size and frequency anywhere. They are out of stock until late october 2015 in mouser and digikey, thankfully they're in stock at farnell and I had to make an order there anyway. I've ordered extra in the case anyone needs. I was about to change the crystal for something in 5032 package which is more readily available but I had already ordered the PCB's. Elecrow seems to be happy so far with the gerbers. Looking at the design rules and browsing the PCB it seems that the tolerances are within the capabilities of all 6mil/6mil chinese manufacturers.
 
Total cost ordering in 1's is about 60€. If anyone is interested I can share a cart for digikey/mouser with everything you need in exact quantity (once you stockpile about 8 large boxes full of leftover SMD's you start seeing the value of ordering just two damn 0603 resitors even if that's more expensive than ordering 25 or 50 as you did when your room had more space)

I've ordered six cases and I have a milling machine that can do plastic. I only plan on building two of these and once I get the milling machine set up right I might machine all six cases so I might offer them here if anyone is interested. I plan on using a CD as a source for polycarbonate windows.

I'll tell you how it goes when It's built. Very nice project.

« Last Edit: August 06, 2015, 11:15:44 am by dmg »
 

Offline shodan@micron

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #26 on: August 06, 2015, 11:32:16 am »
Display - Last time i buy here, but it expensive.
Case - I use this, but you is very similar.
Transformer -  ATB322524-0110, yes, it will be work fine.
Crystal - yeah.. its very rare thing.... But i buy it on Farnell.

Ordered 6 case is good idea, because it need complicated milling like this and this. It make by the hands with Dremel and "file" in first prototype. Last versions fully doing on CNC machine.
« Last Edit: August 06, 2015, 11:47:35 am by shodan@micron »
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Offline dmg

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #27 on: August 06, 2015, 11:48:15 am »
Display - Last time i buy here, but it expencive.
Case - I use this, but you is very similar.
Transformer -  ATB322524-0110, yes, it will be work fine.
Crystal - yeah.. its very rare thing.... But i buy it on Farnell.

Thank you very much, I'm pretty sure that my case is exactly that one. I've seen the exact same model I ordered listed elsewhere with the same dimensions as yours (in my link the case is listed with a height of 18mm but I've see it listed as 14mm with the exact same part number. You know, chinese millimeters aren't always as everywhere else's millimeters).

 By the way, is there anything else I need to know before building the 4.06 version? I've seen that the design is mostly the same as 4.04 except for a 1.6ohm ferrite which is now a 22 ohm resistor and an extra mosfet at the HV power supply. Will it work with the current firmware? I've also read in your blog something about some resin that you applied to the positive terminal of the geiger tube but later you had to scrape off the PCB but I didn't understand very well. Could you explain? I have a friend who speaks russian and could help but she's on holiday.

EDIT: I have a CNC milling machine. The window for the screen and the holes for the buttons are easy to make but the USB micro hole will require a custom tool to support the case in a vertical position. I hope the plastic is ABS or something easy to machine. I'll make a 3D model of the enclosure when it arrives and hopefully I'll get it right before the 6th trial.
« Last Edit: August 06, 2015, 11:55:44 am by dmg »
 

Offline shodan@micron

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #28 on: August 06, 2015, 12:24:37 pm »
Oh... resin this is most complicated thing!
I will try to explain.

My design is based on the ultra-low leakage on HV side.
For this i tested many-many different components on different manufacture and select that diodes and capacitors witch have low leakage. It should be understood very clearly. It means replace component on HV with analogs are not allowed in most cases.

About resin... The decrease in current consumption I was so successful that mosisture level in atmosphere is now be critical to current consumption.
In high moisture level it be high current consumption and battery discharging is faster. I do not like it, although in most cases it is not critical.
So then i try epoxy coating HV area.
But is be big problem.... many epoxy whitch i use shows increase leakage, if compared it to clear HV area.

Dave version as you can see, not coated by epoxy, because it need to be very cleary the PCB layout for video.

This is no critical. Device balanced by current to compensate lekage by mosisture.
Find a high-quality resin is very difficult .... if you are not ready for experimentation, I recommend not use the epoxy resin!

UPDATE it also means, PCB need to be cleared very good with ultrasonic. And i recomend use very good flux(absolutely non conductive), like as Nordson EFD FluxPlus 6-411

I am so sorry, i speak English is very bad, but i hope you understand me.

About 4.04 -> 4.06 change, yes, is little different PCB layout and replace some component on pump side.
Firmware for version 4.02, can be installed on all 4.** generation PCB.

Remember, first you need load bootloader! (DFU.BIN) After that you need upload .DFU firmware via STM DfuSe tool via USB
« Last Edit: August 06, 2015, 12:39:10 pm by shodan@micron »
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Offline axel15

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #29 on: August 06, 2015, 06:15:42 pm »
Well, I tried to recompile English translated Win-software, but too many 3rd party version depended files required.

Axel.
 

Offline shodan@micron

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #30 on: August 06, 2015, 06:21:22 pm »
Just install Delphi JCL
« Last Edit: August 06, 2015, 06:24:08 pm by shodan@micron »
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Offline axel15

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #31 on: August 06, 2015, 09:29:30 pm »
Just install Delphi JCL

That was obvious. But besides Jedi there are some missing properties (modified std Classes?), missing VCL(s) (at least MyTray), version conflict between Jedi and zlib object files (or pngimage-source... can't say), modified or updated Indy... etc etc.
Anyway: too many conflicts between my D7 and dosi-win software.

If it were only changing some texts and recompile I would do that. Investigating and reverse engineering goes beyond my economical effort in this case...

Axel.
 

Offline dmg

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #32 on: August 06, 2015, 09:36:10 pm »
Oh... resin this is most complicated thing!
I will try to explain.

My design is based on the ultra-low leakage on HV side.
For this i tested many-many different components on different manufacture and select that diodes and capacitors witch have low leakage. It should be understood very clearly. It means replace component on HV with analogs are not allowed in most cases.

About resin... The decrease in current consumption I was so successful that mosisture level in atmosphere is now be critical to current consumption.
In high moisture level it be high current consumption and battery discharging is faster. I do not like it, although in most cases it is not critical.

[...]


I was kind of expecting this, thankfully all the components in the HV section are easily available in exact part number, so no problems there. That HV power supply design is a masterpiece. I also have an ultrasound cleaner, but is it OK to clean the board with the SBM-10 installed or do I have to clean it before installation? I'm concerned about vacuum seals potentially cracking due to vibration. I'm no expert on HV/humidity barrier coatings but there are people in my company who are, I'm gonna ask them to see what can be done.

Thanks again
 

Offline shodan@micron

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #33 on: August 06, 2015, 09:38:44 pm »
Its compiled by RAD studio XE6 with JCL, noting else!

You dont need make anything, in this week i added language selector to this software.
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Offline axel15

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #34 on: August 06, 2015, 09:42:52 pm »
Its compiled by RAD studio XE6 with JCL, noting else!

You dont need make anything, in this week i added language selector to this software.

That is very good - and the only thing I was going to do anyway.

Axel.
 

Offline shodan@micron

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #35 on: August 06, 2015, 09:51:35 pm »
dmg - you must clean PCB without buttons, display and SBM-10, all other components must be installed.
Sometime quarz crystals has died in ultrasound, do not use much power ultrasonic clear.

Ah! and... soldering SBM-10 to PCB "sensor contact" must be very qickly. I heatup PCB pad, touch solder to PCB until it touch SBM-10 contact, and move out soldering Iron quickly. Because sbm-10 central pin is sensitive to heat.

UPDATE You can see here, solder just little touch sensor. I not soldered it fully.
« Last Edit: August 06, 2015, 09:56:11 pm by shodan@micron »
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Offline Rubi

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #37 on: August 06, 2015, 09:58:10 pm »
Hi Shodan!

I recommend use Seeedstudio, because it have better "Annular Ring" PCB limitations.

First thank you very much for this great project!

Seeedstudio is also great, esp. when you want to build more than one unit, but I recently prefer oshpark because of the default golden coating , at seed this would cost an extra 20$.

On another great russian project i built recently I had to use dirty pcbs which were extremly cheap and also very good quality but it nearly took two months to get to me.
http://dirtypcbs.com/view.php?share=6586&accesskey=cad38a0e9484b06ec39b33055847b133

Cheers
Michael



 

Offline shodan@micron

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #38 on: August 07, 2015, 04:48:03 am »
I added English version of software to testing branch.
After 2-3 weeks it be released with new firmware. Now it testings....
« Last Edit: August 07, 2015, 05:02:29 am by shodan@micron »
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Offline VK3DRB

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #39 on: August 08, 2015, 06:59:13 pm »
What the country of Japan needs is a tool to detect radioactive trace elements in their food. Invent that and you will become very wealthy. In the meantime, many Japanese are buying foreign fish because they do not trust the stuff from local waters.
« Last Edit: August 08, 2015, 10:52:00 pm by VK3DRB »
 

Offline shodan@micron

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #40 on: August 08, 2015, 11:25:27 pm »
For food needs Alpha + Beta + Gamma sensitive detector.
SBM-10 not sensitive to Alpha and soft Beta. Only hard Beta + Gamma.
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Offline Skibane

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #41 on: August 09, 2015, 02:14:09 pm »
"World's Smallest"?

Not sure about that...



 

Offline shodan@micron

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #42 on: August 09, 2015, 02:16:54 pm »
SIZE: 7.6 x 5.4 x 1.7 cm (3.0 x 2.1 x 0.69 in.) (H x W x D)
WEIGHT: 144 g (5.1 oz), including batteries
:-DD


My device is 18.2 gramm  49*27*14mm.
Yes i know, it is really insane size, but is real.  :box:

Believe me, i don't see dosimeter smaller my.
I see many small devices, but it need PC or smartphone for displaying data. It increase size to smartphone dimension.
Also i see devices without displays(sound or led indications) which smaller, but it can't displayed dose, or do it very-very poor(unusable).

My friend MadOrc make dosimeter called "Nanit" link
It has very close to me, but is bigger and poor functionality. Also it more cheap component price.
We started development at same time, and share ideas between with each other. Because that, this is very similar devices.
« Last Edit: August 09, 2015, 03:36:12 pm by shodan@micron »
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Offline drago

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #43 on: August 09, 2015, 11:29:28 pm »
Awsome project!
I like the clean design especially the high voltage converter but also other features:
 • user interface
 • Nokia display
 • USB ESD protection
 • cute vibration motor
 • digital design

Thanks for sharing this as an open source.
 

Offline shodan@micron

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #44 on: August 10, 2015, 04:09:19 pm »
I added English translation to "Micron monitoring system" link
« Last Edit: August 10, 2015, 04:11:42 pm by shodan@micron »
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Offline Kleinstein

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #45 on: August 10, 2015, 06:27:28 pm »
Food testing is much more complicated. The radiation levels are much lower, so one needs quite heavy shielding.
Normaly they also use only gamma radiation, but a energy seperated cintilation detecor. The expensive part is the detector (special crystal and photomultiplier tube). The electronik can be small and cheap - though in small quatities it has a price. Even than it takes hours to get a usefull reading, unless  the radiation levels are way to high.
 

Offline shodan@micron

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #46 on: August 10, 2015, 08:42:04 pm »
Schematic for PMT can not be cheap, because it need high speed ADC with 16-24 bit accuracy + high speed RAM + high speed MCU (FPGA better) + 1-1.5 kV ultra low noise powersource. It also need 3-5 calibrated radiactive source.
It very complicated device at all.

Maybe if .... use pull pulse duration .... then it can be simple and cheap, but it can't be accuracy between energy levels.
... that device is trash....

More simple and cheap, if you use alpha-beta-gamma high sensitive sensor. It can't be very precisely, but it shows danger level contaminations.


I think this thread is not for discuss about PMT, let's not discuss them here, okay?
It is principally different devices.

As for the ultra-micron, it is designed to protect the user from dangerous gamma radiation, and is meant as a pendant for continuous wear.
In some cases, it can detect hard Beta radiations.

I never claimed that it is suitable for testing food!
But it can be detect gamma source without any problem. Also it can very good to detect Ra-226 (Beta source) (The most common, after Am-241 smoke detector) and many more. As many GM-tube based detectors.
« Last Edit: August 10, 2015, 09:19:36 pm by shodan@micron »
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Offline dmg

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #47 on: August 11, 2015, 12:11:28 am »
Hi again, I just received the main components order but I'll take about a month to get everything else from china. I can't find a datasheet for the screen, do you have one? Could you at least tell me the main dimensions (width, length and thickness) of the screen so I can model it in 3D for the case design?

I live in a part of Spain with relatively high levels of natural radiation. Right where I live it's about 15 uR/h just in gamma radiation according to available maps, but in the mountains nearby it can go up to 30 uR/h. I plan on taking this to mountain trips and monitor the radiation.

EDIT: also, do you have a source for the button plastic keys? I've seen in your blog that you used calculator keys in previous designs but now all your cases have the same black buttons. I can't find them on ebay.
« Last Edit: August 11, 2015, 12:27:16 am by dmg »
 

Offline shodan@micron

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #48 on: August 11, 2015, 12:34:52 am »
Screen has no datasheet. Border on it have protrusion and matrix not symmetrically.
Please wait while you receive it.

Background level is similar at random value, it can be calculated only in very long period.
See graph on this page.
Normal level is 7-20 uR/h. In this range it can be vary random.

As you can see on this map it can be different within the same city/area limits.

Yes on high altitude it be higher, also it can be higher beside in deposits of granite, uranium ore, high content of Ka-40 in ground.

EDIT: Yes i use calculator CT-106 (made in China), therse buttom is transparent plastic. I deleted legend with isopropyl alcohol.
It transparent to LED light. When i charge device keys glowing!
But i think you can't find same model of calculator. I buy it on local store. You need find similar.
« Last Edit: August 11, 2015, 12:54:52 am by shodan@micron »
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Offline dmg

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #49 on: August 11, 2015, 01:01:00 am »
Thanks, I'll get that exact calculator if possible.

Right where I live the soil is basically sand and river sediments but the mountains nearby are mostly made of granite and that's why radiation is higher than average. I hope this device can detect the extra radition.

Besides that, I think that the only potentially highly contaminated area in Spain is near a small southern town where a yankee plane accidentally dropped 4 atomic bombs in 1966 and the explosives in one of them detonated spreading plutonium over a large area. Thankfully it wasn't a nuclear explosion. They cleaned most of the stuff but as far as I know there are places that are still contaminated. I might visit that place one day.
 

Offline SNGLinks

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #50 on: August 11, 2015, 09:52:00 am »
Thanks, I'll get that exact calculator if possible.

Right where I live the soil is basically sand and river sediments but the mountains nearby are mostly made of granite and that's why radiation is higher than average. I hope this device can detect the extra radition.

Besides that, I think that the only potentially highly contaminated area in Spain is near a small southern town where a yankee plane accidentally dropped 4 atomic bombs in 1966 and the explosives in one of them detonated spreading plutonium over a large area. Thankfully it wasn't a nuclear explosion. They cleaned most of the stuff but as far as I know there are places that are still contaminated. I might visit that place one day.

That's near Vera Playa where I go on holiday every year!
 

Offline JackM

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #51 on: August 12, 2015, 08:00:37 am »
Total cost ordering in 1's is about 60€. If anyone is interested I can share a cart for digikey/mouser with everything you need in exact quantity (once you stockpile about 8 large boxes full of leftover SMD's you start seeing the value of ordering just two damn 0603 resitors even if that's more expensive than ordering 25 or 50 as you did when your room had more space)

I am interested in sharing a cart. I am located in Canada however, which might make things more difficult. Let me know!
 

Offline TheElectricChicken

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #52 on: August 12, 2015, 10:41:11 pm »
because it need complicated milling like this and this. It make by the hands with Dremel and "file" in first prototype. Last versions fully doing on CNC machine.

I want to help with this important project. I want to make for myself. I can print 3D, I can Draw 3D. I design for 3D printing. Can you post measurements ? I can draw and post STL file for 3D printing for free. I want to help.
 

Offline shodan@micron

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #53 on: August 13, 2015, 01:29:57 am »
TheElectricChicken - sorry i can't help you.
But dont worry, i product this case many-many hundred pieces and of course in molded high quality plastic.
If I reach an agreement with the milling manufacturer, i share that design.
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Offline JackM

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #54 on: August 13, 2015, 09:33:24 am »
shodan, I've got a question about the chosen values for the resistor network configuration on the buck converter.

Based on the schematic, you've chosen to go with the 4-resistor configuration detailed in the TPS62736 datasheet. It's basically two resistor voltage dividers for the VOUT_SET and the VIN_OK_SET pins that determine the output voltage and set the acceptable VIN threshold to control the VIN_OK output indicator logic pin.

In the TPS62736 datasheet it recommends that the sum of the two resistors in each divider be 13 Mohm. In your schematic you've got a 7.5 Mohm and a 5.1 Mohm resistor for the VIN_OK_SET divider. I was wondering why you chose the 7.5 Mohm instead of an 8 Mohm resistor? Is it because you wanted a slightly lower (2.989V) VIN_OK threshold? I would have figured you'd go for 3.1V as a threshold, but maybe there is something I'm missing here.

Also, for the resistor divider on the VOUT_SET pin, the sum of the two branches (R16 + R17||R20) is no where close to 13 Mohm, it's more like 5.5 Mohm. Why is this? Is it to achieve a very slightly higher input quiescent current?
 

Offline shodan@micron

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #55 on: August 13, 2015, 02:25:48 pm »
JackM, please read datasheet again, on this time read carefully!

13M is not "recommended" value, it is maximum possible value.
Quote
The sum of the resistors is recommended to be no greater than 13 M
It almost has no difference between "1M sum" and "13M sum" (see Figure 22), because that, difference between 5M and 13M is irrelevant.
Also should be noted, 5.5M mode is used only when current is large (illumination, USB, display is active). In this case converter current is irrelevant too.

VIN_OK_SET  - its calculated to 3 volts limits to protected Li-Pol battery. But device work stable only when voltage is higher 3.1-3.2V, this is also valid in my opinion.

Dear Jack, do not worry about current, many times I calculated him and measured with high-precision Agilent 34410A, it is incredibly small.
« Last Edit: August 13, 2015, 08:11:19 pm by shodan@micron »
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Offline dmg

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #56 on: August 14, 2015, 08:31:30 pm »
Hi, I have just received the two SBM-10 I ordered. I am concerned because they make a rattling noise when you move them, like they have something loose inside. Is this normal or did I get two broken geiger tubes?
 

Offline Rubi

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #57 on: August 14, 2015, 11:08:17 pm »
Hi

Mine also rattles, hopefully this is by design.

Cheers
Michael
 

Offline shodan@micron

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #58 on: August 15, 2015, 01:25:22 am »
I have that on sbm-20 sometimes. But on sbm-10 i dont found this symptoms.
Almost every time, sensor with that noise works normal.
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Offline dmg

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #59 on: August 16, 2015, 02:47:08 am »
The seller has told me that some SBM-10 were manufactured with fixed getters, while others have unfixed getters and thus they rattle. Is that a possible explanation?

They don't rattle the same way, one of the tubes sounds like if it had a completelly loose ball inside that can move in any direction while the other sounds like it has a ball attached to some flexible structure/spring. I'm not sure about what's the deal in here, I don't know how the internal structure/components of this tubes would look like. On the other hand considering how small they are I find them quite difficult to break...
 

Offline shodan@micron

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #60 on: August 16, 2015, 03:00:49 am »
Quote
fixed getters

Sorry i don't understand you :(

In any case, this conversation does not make sense. Sensor or good or bad. It is important in this situation.
I unfortunately do not know skills such telekinesis, you should check the sensor in the device.
If it depressurization, it do not work at all. (if sealing glass in sensor is broken)
« Last Edit: August 16, 2015, 03:18:15 am by shodan@micron »
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Offline dmg

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #61 on: August 16, 2015, 03:21:21 am »
I won't get all the parts until late august so I won't be able to test the tubes until then... and ebay buyer protection will have already expired by then, that's why I'm investigating if this rattling is important or not. Apparently rattling SBM-20's are sometimes sensitive to movement and that would be unacceptable for me:
https://mightyohm.com/forum/viewtopic.php?f=15&t=3388

This is exactly what the seller has told me about the fixed/unfixed getters:
Quote
Some manufacturers made tubes with fixed getter, but few manufacturers made is unfixed. it is absolutely normal.

In vacuum tubes (triodes, pentodes, etc) the getter is typically a ring of metal  that they heat after the tube is sealed (they call that flashing) so it sputters a coating of metal that adsorbs residual gases and helps to keep the vacuum. As far as I know geiger tubes aren't in a vacuum and don't require a getter. (https://ru.wikipedia.org/wiki/%D0%93%D0%B5%D1%82%D1%82%D0%B5%D1%80_%28%D0%B3%D0%B0%D0%B7%D0%BE%D0%BF%D0%BE%D0%B3%D0%BB%D0%BE%D1%82%D0%B8%D1%82%D0%B5%D0%BB%D1%8C%29)
 

Offline shodan@micron

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #62 on: August 16, 2015, 03:29:59 am »
This sensor make only one manufacturer.

As i say, my sbm-10 tube don't have noise. (I soldered more 40 sbm-10 tubes, and 20 tube i get in my store right now)
This tube sealed by glass and special compound.
No "Getter".

Sorry i can't help to you in this. All i know already said.

Now i ask my friends about it. Maybe him know.
Yes, one my friend have one with noise, him tells it work good.
« Last Edit: August 16, 2015, 04:15:12 am by shodan@micron »
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Offline dmg

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #63 on: August 25, 2015, 08:46:05 pm »
Today I've received the PCB's and cases and everything fits well. The only components I'm still missing are the screens (on their way but quite delayed because of some "chinese military manouvers"), the vibration motors and some diodes that were out of stock and got sent yesterday so they'll arrive tomorrow. I would have assembled the PCB today if I had the missing diodes... I'm travelling tomorrow and I'll be out of town until september so I'll have to wait.

I have 6 spare PCB's. Let me know if anyone wants one.

 

Offline shodan@micron

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #64 on: August 26, 2015, 04:45:03 pm »
I started assembling this version too.

But i found error on this PCB :palm:
thermal-barrier on pads is missing some place.
Nevertheless i continue build this PCB.

It is not very bad, but i disappointed  :'( :'( :'(
Now i fix this and reload file to my FTP.

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Offline Rubi

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #65 on: August 30, 2015, 03:22:01 am »
Hi

I ordered the 8.06 pcb, does the 8.02 firmware work with this board ?

Is it possible to buy one or two cases from you ?
I am not the best in cutting plastic,...

Cheers
Rubi
 

Offline Rubi

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #66 on: August 30, 2015, 03:23:58 am »

I have 6 spare PCB's. Let me know if anyone wants one.


I could also give some away within the european region.

Cheers
Rubi
 

Offline shodan@micron

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #67 on: August 30, 2015, 03:57:26 am »
firmware version 4.02 work on all 4.** PCB
I do not sell case.
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Offline dmg

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #68 on: August 30, 2015, 05:38:49 pm »
What do you mean by thermal barrier is missing in some pads? Does it mean that you wanted pads to connect like the left image and they connect like the right one? [img]http://i.stack.imgur.com/MkZdx.png[\img]

I still haven't received the screens but now at least they have  left china.

BTW I have 6 cases and I only need 2. I don't think I'll get the machining right the first time and I'll sacrifice one for testing the plastic with my cnc's tools to get the correct speed and feedrate. In the best case scenario I'll get 4 machined cases so 2 spares if anyone wants one.
 

Offline shodan@micron

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #69 on: August 30, 2015, 05:51:37 pm »
Yes.
It must be as right image. But it rule is missing on some polygons.
« Last Edit: August 30, 2015, 05:58:52 pm by shodan@micron »
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Offline osiixy

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #70 on: August 30, 2015, 08:06:48 pm »
At the first blink it was not obvious what that image tried to show, so probably the info below would be helpful to others also.

thermal relief
Since copper is an efficient heat sink, connections to a large region of copper would be very difficult to solder - the copper heat sink prevents you from adequately heating the connection. To fix this, small cutouts are made around each such connection to create a thermal barrier, so that heat applied to the connection stays at the connection. Such a set of cutouts, and the copper bridges that remain, is called a “thermal”. Thermals come in many patterns, which allows the designer to ensure adequate electrical connectivity and/or manufacturability.


Pins with no connection, three types of thermals, and no thermal.



Thermal pads can be seen in several locations on this Printed circuit board (PCB), in particular, the bottom pad of the three vertical pads in the top left corner.



Sources:
« Last Edit: August 30, 2015, 11:02:23 pm by osiixy »
 

Offline dmg

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #71 on: September 01, 2015, 04:32:21 am »
Well, I've almost assembled one ultramicron. I still haven't installed the geiger tube because I've run out of isopropyl alcohol so I can't properly clean the PCB yet, I'll buy some tomorrow and install the geiger after cleanup.

Here are some pictures:
Part way through assembly:

After reflow and fixing some minor shorts. Note the flux residue.(yes, I've reflowed the motor but I think these are reflowable and if not... well... YOLO):

Charging the battery (led not visible due to flash):


As you see I've done a little mod to include a connector for the battery. It's an SMD connector hacked to somewhat fit in there. I've checked and there should still be enough clearance with the case. I've also checked that the geiger can still be assembled and fit in the case this way.

I have uploaded the DFU bootloader succesfully and then loaded the firmware via DFU. No problems there. The micron is detected as a virtual com port but I have issues with the USB geiger program. It doesn't detect the micron automatically (I've assigned the micron to COM2) and this is how the program looks like in my computer (Win 7 64bit, windows classic theme, 1920x1080 screen resolution):


Any clue?

Also, after assembly, programming and powe up I've checked the voltage at the tube terminal and my crappy multimeter tells me it's 200V when it should be 400. Probably the multimeter is loading the supply too much to keep the voltage up... what do you think? I'll check with a real high-z meter at work one of these days.

« Last Edit: September 01, 2015, 05:11:12 am by dmg »
 

Offline shodan@micron

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #72 on: September 01, 2015, 05:17:50 am »
dmg

After you connect the display you need enter to service menu and check "Pump" menu item, it must be "8T" value for your 4.06 PCB.
Until then, please do not turn on the device! On long time working with incorrect settings RUM mosfets can be damage.

You cannot measured voltage directly with incorect Pump settings. And also you cant measured it on sensor pin directly.
It needs very high input impedance high voltage voltmeter, more 100MegaOhms.

You can measured voltage on HV capacitor leads. With standard multimeter (10M input inpedance on DC volt range) It be more 330V.
But it can be measured with an little error by your 10M voltmeter.

"Reverse" service menu - it sets mirrorring image on display. (to compatible with original and china screens)

Enable service menu - Hold "up" key and powerup device. After it bootup you can see in menu hidden menu items.


About USB... you must check.... STM virtual com-port number in you device manager must be equal USB Gaiger settings.

When device be with screen and all settings is right, you need measured "3V" line. When screen is on, it must be 3.08V... when screen is off avg. 1.9V

Afrer you do it, i tell to you new instructions.


About program windows... hmm i think you use in system big fonts or some else.
I cant see this problem on W7x64.
Try run software in Vista compatible mode or some else compatible settings.
« Last Edit: September 01, 2015, 05:34:56 am by shodan@micron »
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Offline dmg

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #73 on: September 01, 2015, 05:33:59 am »
Ouch, I've turned it off right now, I hope I haven't fried the mosfets. I checked the voltage at the HV cap and my crapmeter says 317 V. Anyway I still have materials to build another one in case this one doesn't work or I've fried something.

I'll have to wait for the screens as I still haven't received them. Hopefully they'll be here this week....

edit: Yes, I run on medium or big fonts. But don't worry, after you dowload the logs it becomes usable.
« Last Edit: September 01, 2015, 05:36:41 am by dmg »
 

Offline shodan@micron

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #74 on: September 01, 2015, 05:40:16 am »
Don't worry, i don't see fireworks on wrong settings. :)
The damage is one of the unlikely variants. It need too long time turn on...

« Last Edit: September 01, 2015, 05:42:05 am by shodan@micron »
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Offline callipso

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #75 on: September 01, 2015, 06:25:21 pm »

I have 6 spare PCB's. Let me know if anyone wants one.


I could also give some away within the european region.

Cheers
Rubi

Ooh, do you have any left?
I wonder... **BOOM
 

Offline dmg

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #76 on: September 04, 2015, 05:09:07 am »
Today I got the screen and assembled the tube. I've set the pump to 8T (it was the default value). It always reads 0 uR/h... I think the tube is broken... Any extra things to do?

EDIT: it says BAT= 3.8V, 3V = 3.08V HV=360V

imp/min = 34
« Last Edit: September 04, 2015, 05:14:44 am by dmg »
 

Offline shodan@micron

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #77 on: September 04, 2015, 05:37:50 am »
How HV cap. voltage now?

imp/min = 34 up to 200 it is normal working of Pump cascade and leakage. Its good.

Try touch "+" sensor pin with some metalic. But be careful!
It be increased uRh. If it works, detection circuit is fine.

EDIT!
Also show me photo two sides of your device in high resolution. Not on angle, not as up image.
« Last Edit: September 04, 2015, 05:48:50 am by shodan@micron »
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Offline dmg

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #78 on: September 04, 2015, 05:48:21 am »
My meter measures 308V at HV cap. If i touch with something metalic the uR/h jump a lot and the alarm sounds. I've reset it and now it says between 130 and 172 imp/min but still 0uR/h

By the way how do I wake it up? when it goes to sleep I can only turn it back on by connecting the USB. If I touch the buttons nothing happens.
 

Offline shodan@micron

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #79 on: September 04, 2015, 05:59:44 am »
uR/h is increases when you touch, and line on graph move to "right" after some time, yes?
It means detection circut is fine working.

For wake-up press "up" and "menu" key.

Try set 400-410 voltage in "hide" menu mode, and measure HV cap.

I be wait photo of your PCB (top+bot side) in high resolution.
« Last Edit: September 04, 2015, 06:01:22 am by shodan@micron »
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Offline dmg

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #80 on: September 04, 2015, 06:22:24 am »
I've increased pump voltage to 410 V and I measure 350V at HV cap. My meter is very bad, I'll try at work tomorrow.

Yes, uR/H goes up and the line moves right, that works well.


Here are the pictures, hope they are high resolution enough.





BTW I think it's been working for some time because it was measuring steady 15uR/h, but I moved it to test the HV cap and now it reads 0 uR/h again....
 

Offline shodan@micron

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #81 on: September 06, 2015, 03:58:41 am »
While dmg building case for device. (problem currently resolved via skype)

I've got a spare 4 micron on Ebay



Of Course it extra price, because it is handmade.
« Last Edit: September 06, 2015, 04:28:01 pm by shodan@micron »
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Offline dmg

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #82 on: September 06, 2015, 07:16:55 am »
Well, looks like the first geiger tube I used was bad as it was working intermitently and required higher than normal voltage for starting counting. It was also somewhat insensitive. I've swapped it for the other sensor I had and now I think my UltraMicron is 100% working.

I've popped the bad tube open to see what's inside and what was the source of the rattling noise it had. Turns out there was nothing broken inside. The tube has three main parts, the outer can, an inner tube and a glass insulator that caps the inner tube. That glass insulator is loose and it doesn't seem to have any glue residue nor any other evidence suggesting that this came loose, it was just manufactured like that so the rattling noise is perfectly normal.

Here are some pictures (sorry for the very bad focusing, for some reason my phone had a very hard time focusing on the thing....):



 

Offline JackM

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #83 on: September 07, 2015, 11:28:42 am »
I've popped the bad tube open to see what's inside and what was the source of the rattling noise it had. Turns out there was nothing broken inside. The tube has three main parts, the outer can, an inner tube and a glass insulator that caps the inner tube. That glass insulator is loose and it doesn't seem to have any glue residue nor any other evidence suggesting that this came loose, it was just manufactured like that so the rattling noise is perfectly normal.

Thanks for the interesting dissection photos! Pretty simple device when you get down to it.
 

Offline NO_name

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #84 on: September 08, 2015, 06:40:55 am »
solder it quickly, otherwise and you will have chance to make such photos :)
 

Offline dmg

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #85 on: September 09, 2015, 06:45:33 am »
I made my first attempt to build the case today. It went relatively OK. For anyone that wants to machine a case like this note that they are made of a very easy to machine plastic. It has to be some sort of ABS with tons of fillers that make it hard-ish and resistant to temperature. It won't easily melt and clog your tool. I've been able to machine it at 10k RPM with a 4-flute 1mm end mill that I normaly use for fiberglass laminates and hard stuff using water as lubricant and the results are good enough for the pourpose. All the mills I have for cutting plastics turned out to be too short for the job.



It's still missing the butons and the scren guard, I plan on making the screen guard out of machined polycarbonate from a CD and I'll try to mill the buttons in acrylic. But well, everything fits!
 

Offline Rubi

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #86 on: September 14, 2015, 04:45:08 pm »
Sorry I was on vacation, yes I have one left, pm me your address.

Cheers
Michael


I have 6 spare PCB's. Let me know if anyone wants one.


I could also give some away within the european region.

Cheers
Rubi

Ooh, do you have any left?
 

Offline shodan@micron

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #87 on: September 15, 2015, 05:18:38 am »
I optimize USB data loading speed up to 0.5 sec  >:D
It up to 100 times faster than the Dave videos   :box: :box:
And also do many small fixes.
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Offline NO_name

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #88 on: September 18, 2015, 05:31:58 pm »
Good job, I already have tested it.
 

Offline shodan@micron

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #89 on: September 19, 2015, 06:12:34 pm »
I added uSv units and 60 days logs to device firmware and PC software.



But now, all new features is must contain licensed(8$).

I got a lot of offers on the production from many different companies, but not one of them do not agree my fees 1% sale price.
Also i be forced to delete all sourcecode of firmware and PC Software in public repository. I afraid it be steal my project.

Now i provide only "compiled binary firmware".
Without license on it, work almost all features, except new.

Ah... 8$ - it is because... no one... NO ONE of all people who make my devices of many-many years, not donate just a cent for my projects.... no one ...
I think... it little fees for some features and closed source... do people little more generous in future. :)
« Last Edit: September 19, 2015, 06:36:12 pm by shodan@micron »
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Offline JackM

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #90 on: September 22, 2015, 09:58:38 am »
Also i be forced to delete all sourcecode of firmware and PC Software in public repository. I afraid it be steal my project.

Now i provide only "compiled binary firmware".
Without license on it, work almost all features, except new.

That's too bad to hear :(
I was still planning on making one of these dosimeters of my own and even possibly contributing to the project.
 

Offline shodan@micron

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #91 on: September 22, 2015, 02:40:49 pm »
I add payment form here
Also on that page you can see what features locked in freeware mode.

UPD:
We arrived new PCB 4.06 with black mask.
« Last Edit: September 23, 2015, 12:43:31 am by shodan@micron »
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Offline dmg

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #92 on: September 27, 2015, 11:01:41 pm »
Why building one when you can build two?

Both are now working, I need to machine a new case for the second one and re-clean it a little bit. The one in the case has a rattling tube, the other has a non-rattling tube. I've checked them for a while and they correlate very well, not only do they stay at almost the same radiation level but they do track each other very well too, if one starts reading higher the other follows the trend very soon. This mostly confirms that indeed I have the radiation record of all microns currently registered within the monitoring system and that the tubes are consistent with each other. Next step is finding something radioactive to test them, maybe I'll hide one of these inside the pile of bananas at the supermarket...

I've had a lot of fun building these, It's hard to find great self-contained and useful proyects that are worth building in these days of arduinos, and this is also a very good lesson on low power electronics and power converters.
 

Offline SeanB

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #93 on: September 27, 2015, 11:33:30 pm »
Big bulk pack of gas mantles will work well as a test source. The cheaper the better, just buy a big pack of the cheapest ones, which will have enough Sr in them to register above your background levels.

If you have piped natural gas that is also slightly radioactive from Radon inside it.
 

Offline apis

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #94 on: September 28, 2015, 02:44:08 am »
This is indeed a cool project.

I'm sorry if this is a stupid question but why is the isolation so important on the HV side, is it to save battery power or is it because the detection circuit is so sensitive?

(And system shock was a good game  ^-^)
 

Offline shodan@micron

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #95 on: September 28, 2015, 02:48:47 am »
I'm disappointed in isolation.
All that I have used, is conducting .... is a little .... 10-20 Gohms, but it crirical.
Also some epoxy has blow up(crack) components when polymerized.

Now I do not recommend isolation of HV circut.

And offcourse it is sensitive. for 3uA on low voltage side, it need ultra-high quality components on high voltage side and ultra clean PCB, for low lekage.
Otherwise current be high.

« Last Edit: September 28, 2015, 03:00:44 am by shodan@micron »
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Offline shodan@micron

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #96 on: October 04, 2015, 05:03:00 pm »
Data loading speed is increased to speed of light  >:D
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Offline frank_gamefreak

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #97 on: February 14, 2016, 11:44:23 pm »
Hello,
can I buy the UltraMicron somewhere?
I am very interested in the data the device provides.
But unfortunately I lack the knowledge to build the device.

I want the end of my trip to Japan Blog restart. Of course, the data would be very intresting by fukushima.
Thank you very much
 

Offline shodan@micron

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #98 on: February 15, 2016, 12:55:21 am »
Dear frank, unfortunately i do not sell it now.
Just because i have no time for it.

By the way!
Yesterday i publish new device, Ultra-Micron gen. 5  !

With new sensor SI-19BGM.
It sensitive for Gamma, Beta and Alpha particle. And now it can measure of particle flux via "particle per square centimeter".

As i can see, this topic has dead :(
It is sad!

Maybe X-Rays scans of Ultra-Micron gen.5 be interested for EEVBlog users.   :box: :box:











« Last Edit: February 15, 2016, 01:05:31 am by shodan@micron »
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Offline frank_gamefreak

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #99 on: February 15, 2016, 01:05:33 am »
Dear frank, unfortunately i do not sell it now.
Just because i have no time for it.

No problem, maybe someone else can help me in this forum?

By the way, is this (https://oshpark.com/shared_projects/sQYExg6e) the new one?
« Last Edit: February 15, 2016, 01:10:13 am by frank_gamefreak »
 

Offline shodan@micron

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #100 on: February 15, 2016, 01:07:40 am »
No, because my destribution license allow build it only for itself! Not for selling.
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Offline frank_gamefreak

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #101 on: February 15, 2016, 01:23:49 am »
I can understand you well, you want that is not stolen your idea. I have but the problem that for me knowledge, technique and skill is lacking :'( .
Moreover, I think that is not "selling" here. I pay the material and working time for only one device.
And I can imagine to donate to you, even if someone else is solder for me.

But please answer my second question, is this (https://oshpark.com/shared_projects/sQYExg6e) the new one?
 

Offline shodan@micron

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #102 on: February 15, 2016, 01:28:04 am »
I try tell:
Anyone can make few copies for itself.
I not allow to anybody build these devices for selling or distribution.

"I pay the material and working time for only one device." - that is also selling.

If you can't build it, try learn! It project i made for hobbyists who like build some devices by itself.

In OSHpark, yes it is.
« Last Edit: February 15, 2016, 01:41:04 am by shodan@micron »
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Offline frank_gamefreak

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #103 on: February 15, 2016, 03:05:39 am »
"I pay the material and working time for only one device." - that is also selling.
It's like giving a beer to a good friend for his help or is it also selling for you? I don't say bring it on the market...


It project i made for hobbyists who like build some devices by itself.
And I'm a hobbyist how likes to make something with the data provided by the device.
But I'm not good at suche things like soldering, because of my shaky hands. I've been just not steady enough.

You have the opinion because I'm not good enough in dealing with the soldering iron, I may not have the hardware?
This contradicts the open source idea completely. I do not know what you want to achieve with it.
 

Offline shodan@micron

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #104 on: February 15, 2016, 04:38:35 am »
Please do not flood, just accept my distribution rules. It is simple.
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Offline osiixy

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #105 on: February 15, 2016, 08:34:27 am »
This is just a hint for your clue.

You see, you are the one who killed your own project,
why would anyone be part of it?

You own it, you sell it or just let it die peacefully,
there is not much reason to contribute with you.

This gadget just faintly more than a proprietary stuff,
so you are the one who needs to decide how to treat it.

If you stick to it so hard and also want to share it with others
someway do everything by yourself.
(Arrange the mass production, retailing and selling).

OR just simply amuse yourself and few of your fellas.
 

Offline shodan@micron

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #106 on: February 15, 2016, 08:46:52 am »
My project alive from 2012 year, and it's not dead. :-DD :-DD

I do not see hobbyst here, it is sad for me... i see only "I CAN'T" "I WANT BUY" "MASS PRODUCTION"....
No hobbyists... almost nobody!

Guys, grab a soldering iron!  ;)

See on DMG ! He one of all users just make device to itself! One of all!
My friends in Russia build a hundred pcs. of these devices. I send it do Dave because i hope it be interested to hobbyists like me.
« Last Edit: February 15, 2016, 08:52:19 am by shodan@micron »
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Offline osiixy

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #107 on: February 15, 2016, 08:53:42 am »
Be happy with yourself, your attitude and few of your friends.

I will do the same with my "solder iron", what is working, even if you "do not see".
« Last Edit: February 15, 2016, 09:02:10 am by osiixy »
 

Offline frank_gamefreak

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #108 on: February 15, 2016, 08:59:14 am »
I do not see hobbyst here, it is sad for me... i see only "I CAN'T" "I WANT BUY" "MASS PRODUCTION"....
No hobbyists... almost nobody!
Okay my hobby is not make new hardware that is true, but my hobby is big data.
I'm working on projekts like loklak.org or yacy, why is using data no hobby?

And I want to contribute to you.
 

Offline shodan@micron

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #109 on: February 15, 2016, 09:02:09 am »
Okay my hobby is not make new hardware that is true
So this project is not for you. Sorry!
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Offline frank_gamefreak

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #110 on: February 15, 2016, 09:05:25 am »

Why you give yourself then the effort to create a possibility to load the data to the PC?
I do not get the idea
 

Offline osiixy

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #111 on: February 15, 2016, 09:08:00 am »
I do not see hobbyst here, it is sad for me... i see only "I CAN'T" "I WANT BUY" "MASS PRODUCTION"....
No hobbyists... almost nobody!
Okay my hobby is not make new hardware that is true, but my hobby is big data.
I'm working on projekts like loklak.org or yacy, why is using data no hobby?

And I want to contribute to you.

It has been revealed: "So this project is not for you. Sorry!
" , do not worry it is not for me either and many other "inferior ones", even if I am able to assemble it.
 

Offline shodan@micron

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #112 on: February 15, 2016, 09:08:49 am »
frank_gamefreak - All who want it, already load data to PC and internet.

As example: https://xn--h1aeegel.net/index_en.html
« Last Edit: February 15, 2016, 09:11:53 am by shodan@micron »
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Offline frank_gamefreak

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #113 on: February 15, 2016, 09:14:23 am »
If you think I'm not the person for your device... help me to finde a divce which i can use without you.
Noone will earn money with the data on a travel blog but I can show that japan is safe to travel.
I love Japan.
« Last Edit: February 15, 2016, 09:16:18 am by frank_gamefreak »
 

Offline shodan@micron

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #114 on: February 15, 2016, 09:18:04 am »
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Offline Someone

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #115 on: February 15, 2016, 09:59:45 am »
If you think I'm not the person for your device... help me to finde a divce which i can use without you.
Noone will earn money with the data on a travel blog but I can show that japan is safe to travel.
I love Japan.
Just measuring external count rates does not provide the complete picture, ingestion/inhalation of alpha emitters is possibly the biggest risk after an accident and very hard to measure with compact or cheap equipment.
 

Offline frank_gamefreak

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #116 on: February 15, 2016, 07:04:42 pm »
If you think I'm not the person for your device... help me to finde a divce which i can use without you.
Noone will earn money with the data on a travel blog but I can show that japan is safe to travel.
I love Japan.
Just measuring external count rates does not provide the complete picture, ingestion/inhalation of alpha emitters is possibly the biggest risk after an accident and very hard to measure with compact or cheap equipment.
I think some data is better than no data. I think for a guidance value the unit is good.

Try this https://www.sparkfun.com/news/1099
Your device looks like a better one.
 

Offline shodan@micron

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #117 on: February 15, 2016, 08:50:13 pm »
My device is a very dumb for monitoring a nuclear disaster.
You need BIG gaiger at minimum. Better you are need spectrometer + good(BIG) Alpha counters.

Otherwise, you will not see a large percentage of infection. Like Dave, when he try measure smoke detectors.
As example my Am-241 source emmits 28 uSv/h low energy gamma and 1 million particles at 1cm^2 per minute via Alpha.

But for measure it with Alpha counter you need move radiation source closer to device and open sensor. Like as picture.
Spectrometer can detect contamination with very long distance.

Besides, I told you before, any distribution fee it is deny! Only I have the right to do so. But now i no have time for it.

« Last Edit: February 15, 2016, 08:58:19 pm by shodan@micron »
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Offline frank_gamefreak

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #118 on: February 16, 2016, 09:42:38 am »

Besides, I told you before, any distribution fee it is deny! Only I have the right to do so. But now i no have time for it.


Sounds like microsoft for me... not like open hardware.
Sorry that is my opinion.
 

Offline shodan@micron

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #119 on: February 16, 2016, 09:50:57 am »
This is open, but i deny distribution by fee.
It is my right, and I use it.
As I say to you yesterday... this project not for you.
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Offline osiixy

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #120 on: February 16, 2016, 09:53:53 am »

Besides, I told you before, any distribution fee it is deny! Only I have the right to do so. But now i no have time for it.


Sounds like microsoft for me... not like open hardware.
Sorry that is my opinion.

Exactly, with just a little difference: other owners of successful proprietary stuff take the effort to reach  the goal by themselves,
when they have decided that they do not want to share their goods for real. That is viable way of thinking and who thinks it seriously
can do it seriously.
 

Offline osiixy

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #121 on: February 16, 2016, 09:56:21 am »
This is open, but i deny distribution by fee.
It is my right, and I use it.
As I say to you yesterday... this project not for you.

FREEMIUM
 

Offline shodan@micron

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #122 on: February 16, 2016, 10:01:27 am »
FREEMIUM
You are wrong!

Source code and hardware is open!
I no longer receive a license fee and provided keygen and all sources to public!
I only get stats about count of assembled devices.

Any hobbyst can use my source, but he(or some else) can't get fee on any reason. It is open for my opinion!

Open it don't mean - any can get fee on my project.

That means yours flood is fail. :-DD :-DD :-DD


I like when people learns, do some device by hands, I respect that!

But when someone complains that he lacks experience to do make some OPEN hardware what he wants. I hate that!
If you can't do some, learn it! This is useful!

Sorry for my opinion!
« Last Edit: February 16, 2016, 10:53:31 am by shodan@micron »
My lab in Instagram.
 

Offline Someone

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #123 on: February 16, 2016, 10:57:21 am »
If you think I'm not the person for your device... help me to finde a divce which i can use without you.
Noone will earn money with the data on a travel blog but I can show that japan is safe to travel.
I love Japan.
Just measuring external count rates does not provide the complete picture, ingestion/inhalation of alpha emitters is possibly the biggest risk after an accident and very hard to measure with compact or cheap equipment.
I think some data is better than no data. I think for a guidance value the unit is good.
Suggesting an area is "safe" from incomplete data would be very dangerous.
 

Offline osiixy

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #124 on: February 16, 2016, 05:29:43 pm »
FREEMIUM
You are wrong!

Source code and hardware is open!
I no longer receive a license fee and provided keygen and all sources to public!
I only get stats about count of assembled devices.

Any hobbyst can use my source, but he(or some else) can't get fee on any reason. It is open for my opinion!

Open it don't mean - any can get fee on my project.

That means yours flood is fail. :-DD :-DD :-DD


I like when people learns, do some device by hands, I respect that!

But when someone complains that he lacks experience to do make some OPEN hardware what he wants. I hate that!
If you can't do some, learn it! This is useful!

Sorry for my opinion!

It does not matter. You have the right for your opinion, and changing it as many times as you wish
(but you was the one also who complaining:
But now, all new features is must contain licensed(8$).

I got a lot of offers on the production from many different companies, but not one of them do not agree my fees 1% sale price.
Also i be forced to delete all sourcecode of firmware and PC Software in public repository. I afraid it be steal my project.

Now i provide only "compiled binary firmware".
Without license on it, work almost all features, except new.

Ah... 8$ - it is because... no one... NO ONE of all people who make my devices of many-many years, not donate just a cent for my projects.... no one ...
I think... it little fees for some features and closed source... do people little more generous in future. :)
)

I have got no intention to follow your project so deeply to learn
that you do not insist on money anymore (which is acceptable
but in this case your DIY open design hardware is a honeypot
for FREEMIUM pricing strategy, which is also OK just lets clarify definitions).

I also agree that doing hardware by yourself is a wonderful way to gain new
knowledge, I do the same, and there is nothing fancy or impossible with SMD
(but it is also a fact that not everybody has all the possibilities to get in to it,
you can be sure it does not matter how tough or repelling you are you cannot
stop others to crack your code get around your restrictive licensing.
IMHO there are already many guys who are selling your gadget but not
interested in to notify you. They help themselves and others, who are
imbecile and inferiors in your eyes, out).

Be tough like adamant you have the right!
 

Offline shodan@micron

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #125 on: February 16, 2016, 06:01:11 pm »
osiixy - Yours misconception not interested for me.

No need crack my code ;D it is open fully and included keygen.

PS.As i see you just dont understand me. Sorry i cant help you. I try to explain, but you don't understand again...
« Last Edit: February 16, 2016, 06:08:12 pm by shodan@micron »
My lab in Instagram.
 

Offline frank_gamefreak

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #126 on: February 16, 2016, 06:09:48 pm »
IMHO there are already many guys who are selling your gadget but not
interested in to notify you. They help themselves and others, who are
imbecile and inferiors in your eyes, out).

You're absolutely right. I was just kind enough to ask you.
I also could go to the nearest university and ask for help there. You would never know it.  :-//
I would donate something for education in my town.
 

Offline osiixy

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #127 on: February 16, 2016, 06:16:23 pm »
osiixy - Yours misconception not interested for me.

No need crack my code ;D it is open fully and included keygen.

PS.As i see you just dont understand me. Sorry i cant help you. I try to explain, but you don't understand again...

I rejoice with you over your supremacy!
 

Offline dmg

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #128 on: March 02, 2016, 09:46:15 am »
I missed this, and yes, I'm building the new model too. Already ordered the tubes and shodan was kind enough to give me a couple PCB's, so I'm in business again. If all goes well and I don't break any tube (they're expensive) I'll build two.
Being alpha sensitive I'll hopefully be able to monitor radiation from granite.

EDIT: Maker culture is quite different in Russia than it is in the US or Europe, russians tend to pride themselfs a lot in creations and tend to be quite zealous about diffusion until the product is mature and well proven. I don't see the rules in this proyect that abussive, It's just open as long as you don't make any profit from it, pretty common in software (non-commecial usage licenses). This limits the diffusion and the liability of the creator. Imagine if this went mass-produced and sold by someone... being quite a delicate device that's not designed for mass-production and has fragile components inside and requires technical knowledge to operate, I imagine people would break things and then likely turn to shodan for support, so he'll end up supporting people and getting in trouble for free, while other gets the profit.
« Last Edit: March 02, 2016, 10:17:43 am by dmg »
 

Offline frank_gamefreak

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #129 on: March 06, 2016, 10:00:38 am »
Maker culture is quite different in Russia than it is in the US or Europe, russians tend to pride themselfs a lot
It simply proves all prejudices i have.
 

Offline osiixy

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #130 on: March 06, 2016, 10:23:49 am »
Maker culture is quite different in Russia than it is in the US or Europe, russians tend to pride themselfs a lot
It simply proves all prejudices i have.

 ;D No need to have that sort of prejudices  ;D
I know so many type of people regardless to her or his nationality.
I even know quite nice Russians.

So, if you take my advice, draw a conclusion per se.
(but you do not need to take it, everybody has her or his own way,
my part is only to decide if I would like to be part of her or his life).

(that's f*cking nothing wisdom and absolutely futile,
do not take me seriously)
 

Offline teddhj

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #131 on: April 18, 2016, 03:56:07 am »
I have build the 5.01 model .
First time for me to build with SMD ...let me tell you it's very small :) I did use USB microscope and magnifying glasses.
I will recommend to build the one with Mica window ....it's actually very sensitive and you can detect Alfa radiation.
I want to thank Shodan for all help and support without his help i will not have made it. He even sent me a Geiger tube for free to help me finish the project :)
Shodan did a excellent piece of engineering on this geiger counter.

Here is som Picture from the Build........






 

Offline shodan@micron

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #132 on: April 18, 2016, 07:45:22 pm »
Tedd good job!  :clap:

In original i insert acrylic window to protect display.
« Last Edit: April 18, 2016, 07:57:16 pm by shodan@micron »
My lab in Instagram.
 

Offline shodan@micron

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #133 on: March 13, 2017, 11:48:17 pm »
Newest Ultra-Micron 4.08 sales again!

http://www.ebay.com/itm/322450048594

! Now with calibration reports. Tested by high precision OSGI-R Gamma ray calibration sources.
« Last Edit: March 13, 2017, 11:50:54 pm by shodan@micron »
My lab in Instagram.
 


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