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1
Test Equipment / Re: Rigol MSO2000 series hacking
« Last post by milek22 on Today at 01:06:53 AM »
how to open a second window "bfin-gdbproxy.exe" it writes falided usb cable,
In any window, you can not write anything ???
What's going on?
2
Beginners / Re: a 100y lifetime project : incredibly difficult ?
« Last post by coppice on Today at 01:01:01 AM »
Most electronics engineers have the attitude that getting rid of moving parts is generally getting rid of wear and tear, and increases reliability and life expectancy. The reality is its easy to make a mechanical timer than will run for 100 years, and really really really hard to make an electronic one do the same thing. You would need to develop new components for almost every part of the device, as off the shelf ones have something that will chemically degrade over 100 years.
3
Test Equipment / Re: Siglent SDS2204 + MSO review
« Last post by nctnico on Today at 12:52:44 AM »
Today I have tried to use the FFT function to look for distortion (clipping) in a 1kHz signal. The frequency scale seems to be driven by 2 factors:
- memory length
- time base setting

With the memory length set to 7kpts (shortest) and the timebase set to 20ms I could get a frequency scale low enough to see the 1kHz signal and distinctive harmonics (2kHz and 3kHz). Unfortunately setting the timebase this slow makes the signals invisible.

IMHO the FFT function would be better if the FFT uses more points if you zoom in (more detail) and when averaging can be applied to the FFT results. I wouldn't mind slower FFT updates.
4
Test Equipment / Re: Hantek - Tekway - DSO hack - get 200MHz bw for free
« Last post by tinhead on Today at 12:50:02 AM »
i accidently removed the dso.exe while playing around in the shell for the very first time (i am indeed a total noob)
when i try to start my Hantek DSO5102B it just freezes on the boot screen :S

not a big problem, simply copy new one and change permission to +x

Maybe someone out tthere has got the correct dso.exe? and maybe willing to share?

go to my OneDrive, to "DSO hacks -> firmware -> hw1.01 -> Voltcraft-DSO". You have Hantek DSO5000B,
but as there is no 140315.0 fw for Hantek (but for Voltcraft, which is the same fw) take the one for Voltcraft, e.g.

dso5kb_func_dso1202d_3.30.0_20140315.up

download gpg (for your OS) and decrypt that dso5kb_func_dso1202d_3.30.0_20140315.up file,
as password for gpg use dso5000b. Then take winrar or what so ever and gunzip the file, then untar
the resulting file and untar it again. Now you will see directory with files. Copy the dso.exe to flash drive,
take it to DSO, insert and copy from flash to DSO root, e.g.

cp /mnt/udisk/dso.exe /
sync

then give executin rights

chmod +x /dso.exe

and test is by executing /dso.exe

When it runs you can take latest firmware and update your DSO
 
5
Beginners / Re: a 100y lifetime project : incredibly difficult ?
« Last post by ker2x on Today at 12:46:34 AM »
And then there are the problems when someone moves to a Mars colony. On mars the solar day is 24 hours and 39 minutes. So you should add some buttons to adjust the length of the day, and to adjust the time if someone just moves to another timezone, because it could display the time as well, and I think it should increase the day count always on midnight.

Let's plan this feature for the version 2, when the v1 will reach its EOL  :-DD
6
Beginners / Re: a 100y lifetime project : incredibly difficult ?
« Last post by Pedram on Today at 12:44:07 AM »
a solar panel and a supercap may give you 20 years.

a primary lithium battery also may give you 25-30 years.


100years.... hmmmmmm



Please report back in 2114 in this thread how it did go :)

Let's hope Sagan keep this forum alive until 2114!
7
Repair / Re: Dremel 3000
« Last post by robrenz on Today at 12:42:32 AM »
I got an inexpensive but full size flexible shaft for Christmas this year. Basically a Foredom copy and Foredom handpieces fit it.  I am surprised but my many dremels are collecting dust now. Having foot speed control and lower min rpm is priceless in many situations. As is being able to get the tool in position on the part not running then slowly advance the speed to your liking.  The handpieces just snap on and off the shaft so I have three different ones. One drill chuck style with 1/4" capacity, the 5/32 capacity drill chuck style that came with the unit, and my favorite is the Foredom H28 collet style handpiece (pic below). The basic flex shaft was $70.00 at my local flea market and is pretty decent quality.

After my 8 months of industrial use I now highly recommend a flex shaft over a dremel.

8
Beginners / Re: a 100y lifetime project : incredibly difficult ?
« Last post by FrankBuss on Today at 12:40:40 AM »
I would use an epaper display:
http://www.frank-buss.de/raspberrypi/epaper/index.html
Needs only power to change the image, but no power to show it. But no idea about the lifetime of it, 100 year is a lot. Same for a microcontroller: the flash might not hold the charges so long, maybe use some old school CPU with an EPROM, but then it needs more power and you would need a big solar cell area. Maybe a smart algorithm which refreshs the flash every some years might work.

And then there are the problems when someone moves to a Mars colony. On mars the solar day is 24 hours and 39 minutes. So you should add some buttons to adjust the length of the day, and to adjust the time if someone just moves to another timezone, because it could display the time as well, and I think it should increase the day count always on midnight.

Accuracy should be no problem, because 100 years are 36,500 days. A 10 ppm crystal (for less than 2 dollar at Digikey) would have an error of 1/3 day after 100 years. But maybe worse after 100 years? Probably a good idea to add an IR sensor to do some day light synchronisation.

Please report back in 2114 in this thread how it did go :)
9
Great teardown. That little sensor package is so cute... I wonder how long it'll be before smartphones start coming with them integrated as an option, with them being so easy to interface.

FYI the Apple connector ID chip is not much more than a 1-wire EEPROM that holds information about what the cable is and probably things like a serial number; the fact that their custom chip also has "2501" on the die reminds me of the DS2501 infamously used in Dell's laptop AC adapters for a similar purpose... and comparing the BQ2024/6 datasheets with the DS2501/2 ones, they are very similar.
I think the Apple chip does 2-way authentication - if it was just a memory the Chinese would have long since cloned it.


(I may be the first one on the Internet to notice this similarity. :o)

It might be possible to connect a Flir One to an Android device via USB OTG...
10
..ARM also lowers the likelihood of vendor lock in.

The ARM cores are the same but you cannot source your favourite ARM chip from another vendor, so locked in you are young Luke!

The vendor lock-in is a lot more powerful when you have to change ISAs as well though.  At least the various ARM chips are roughly comparable and have the same idiosyncrasies.

Quote
I dont work that close to the metal and Everything is done in C these days I personally wouldnt have a clue if the machine code generated was arm or mips or FutureMegaChipX, and I cant say I really care so long as the IDE, documentation and libraries are good, the price is low and the supply is good.

I invariably end up doing some work at the assembly level if only because of compiler issues.

People I know pick MC micros because they are familiar with the peripherals (and MC peripherals are very good). Other than that PIC32 is pretty boring chip - old core, high power consumption, etc. On the other hand, Microchip parts have good availability and they sell any quantity directly, which is a huge plus these days.

Microchip has great documentation and availability.  The later makes up for them being a sole source as far as 8 and 16 bit PIC compared to their competitors in that space but for PIC32, ARM is an alternative to MIPS.  I would really love to see Atmel as an alternative but they have not lived up to that.
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