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Author Topic: $20 LCR ESR Transistor checker project  (Read 870879 times)

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Offline madcat

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Re: $20 LCR ESR Transistor checker project
« Reply #3475 on: April 21, 2017, 08:31:33 PM »
ooops sory.. i just had my time to edit my post earlier.. but apparently it was posted after you replied.  :palm:
no, i didn't say that the color has anything to do with the fuses.
i just try to answer your "another" question about setting the fuse, which all i know is using the one i posted earlier.
i'm sorry if it didn't help.  :)
 

Offline madires

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Re: $20 LCR ESR Transistor checker project
« Reply #3476 on: April 21, 2017, 09:40:44 PM »
And regarding colors, the k-firmware has a function to change the pen and background colors. The m-firmware uses a few colors more which can be set in colors.h (before compiling the firmware).
 

Offline Gino_09

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Re: $20 LCR ESR Transistor checker project
« Reply #3477 on: April 21, 2017, 10:29:33 PM »
Load 1.28 m-firmware AY-AT, color now ok but response very very slow and rotary not run i can set only pwm.

Any idea?
Thanks
 

Offline perieanuo

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Re: $20 LCR ESR Transistor checker project
« Reply #3478 on: April 21, 2017, 11:30:01 PM »
Load 1.28 m-firmware AY-AT, color now ok but response very very slow and rotary not run i can set only pwm.

Any idea?
Thanks
If you put inside the right quartz - I used 8 MHz - it should be fine otherwise you have to check quartz,encoder,maybe voltage issues...
First check your quartz.mine is ok
Best regards,Pierre


Envoyé de mon iPad en utilisant Tapatalk
 

Offline madires

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Re: $20 LCR ESR Transistor checker project
« Reply #3479 on: April 21, 2017, 11:34:47 PM »
Possibly wrong clock prescaler (lfuse), something like /8 instead of /1.
 

Offline jleg

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Re: $20 LCR ESR Transistor checker project
« Reply #3480 on: April 22, 2017, 12:27:20 AM »
So now I am not sure what to do (to reiterate: the original AVR is probably fried as cause of charged capacitor testing and now the tester measures wrong values). Maybe I could replace whole PCB and DIY a new one, reusing only the LCD and use PDIP atmega328.
well, i once also made the "mistake" trying to *repair* a broken LCD on my tester - only to find out later that complete new units became incredible cheap meanwhile...  ::)
http://www.ebay.com/itm/LCR-T4-Resistance-Capacitor-Diode-SCR-Transistor-ESR-Meter-Tester-9V-128-64-LCD-/191958490359?hash=item2cb19e1cf7:g:zyAAAOSw5ClXxnfh
 

Online jellytot

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Re: $20 LCR ESR Transistor checker project
« Reply #3481 on: April 22, 2017, 02:32:19 AM »
Hi madires. I have  this  http://www.banggood.com/DANIU-3_5inch-Colorful-Display-Multi-functional-TFT-Backlight-Transistor-Tester-p-1083042.html which has a faulty micro and I was wondering if there
is any work supporting it? It uses an atmega 324pa. I've already searched online but it looks like the info is top secret..
 

Offline madires

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Re: $20 LCR ESR Transistor checker project
« Reply #3482 on: April 22, 2017, 02:53:31 AM »
Both firmwares (k & m) support the ATmega324 (and 644/1284). If it's toast I'd recomment to replace it with a 644 which got twice the flash memory, EEPROM and RAM.
« Last Edit: April 22, 2017, 02:55:29 AM by madires »
 

Online jellytot

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Re: $20 LCR ESR Transistor checker project
« Reply #3483 on: April 22, 2017, 03:29:06 AM »
Thanks madires for the quick reply. I've already got a cheap 324 installed but I'm wondering if the ir code tester and zener tester functions would be supported in the  k or m versions ?
or how difficult it would it be to add them.? I'm not good at coding and I suppose I am just looking for something already compiled to flash to micro...I know lazy  ;D
 

Offline madires

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Re: $20 LCR ESR Transistor checker project
« Reply #3484 on: April 22, 2017, 04:03:31 AM »
k: zener check
m: zener check and IR detector/decoder
 

Online jellytot

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Re: $20 LCR ESR Transistor checker project
« Reply #3485 on: April 22, 2017, 04:49:36 AM »
Thanks madires. I'll have a play with it and see what I can come up with  :)
 

Offline esrtester

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Mega328 / LCR/T4 - changed to always on?
« Reply #3486 on: April 22, 2017, 04:51:29 AM »
I wonder if anybody can tell me whether the cheapo Mega328 / LCR/T4 type push button testers can be jumpered to always on?

I watched a YouTube video where somebody did a quick test of 2 different capacitors before the tester turned off - and it read both capacitors

I believe some of these testers have a row of jumpers and changing the shorting wire to another pair of jumpers changes the switch off time - anybody tried a tester without a jumper at all?
 

Offline madires

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Re: $20 LCR ESR Transistor checker project
« Reply #3487 on: April 22, 2017, 05:39:35 AM »
If you run the m-firmware and power on the tester with a long key press, it will be in auto-hold mode, i.e. it will stay powered on.
 

Offline esrtester

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Re: $20 LCR ESR Transistor checker project
« Reply #3488 on: April 22, 2017, 05:49:18 AM »
That's really good news - but how do you know which of the testers are running m-firmware - not seen any reference to firmware version in any of the advertisements on ebay, amazon, banggood, etc.
 

Offline madires

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Re: $20 LCR ESR Transistor checker project
« Reply #3489 on: April 22, 2017, 06:17:35 AM »
Simply program the MCU with the version you like ;)
 

Offline esrtester

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Re: $20 LCR ESR Transistor checker project
« Reply #3490 on: April 22, 2017, 06:30:03 AM »
Now it's getting complicated

I want to buy one ready made that will stay on and read ESR on caps on circuit boards

Reading loose components and identifying/testing them would be a bonus - but I could buy a second one for that if necessary

Anybody on here selling m-firmware testers?

Flashing chips is not my thing
 

Offline Gino_09

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Re: $20 LCR ESR Transistor checker project
« Reply #3491 on: April 22, 2017, 08:01:13 PM »
My little contribution: Italian translation m-firmware. (If not acceptable delete as well).

--------------
Please read next two posts with correct file.
« Last Edit: April 23, 2017, 03:10:21 AM by Gino_09 »
 

Offline madires

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Re: $20 LCR ESR Transistor checker project
« Reply #3492 on: April 23, 2017, 12:38:23 AM »
Grazie! I'll add it to the source. Some strings are a little be too long (max. 14 characters for menu items and 16 for other stuff to keep everything within the typical 16 char/line range).
« Last Edit: April 23, 2017, 12:56:23 AM by madires »
 

Offline Gino_09

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Re: $20 LCR ESR Transistor checker project
« Reply #3493 on: April 23, 2017, 02:28:18 AM »
Grazie! I'll add it to the source. Some strings are a little be too long (max. 14 characters for menu items and 16 for other stuff to keep everything within the typical 16 char/line range).

Correct.
 
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Offline hapless

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Re: $20 LCR ESR Transistor checker project
« Reply #3494 on: April 23, 2017, 08:21:09 AM »
About "Accoppiatore opt". Would it be saying something different if it were optocoppia or optoisolatore instead? Also, do any of the words you used usually need an accented letter? Lastly, what encoding do you usually use for Italian when using a localized Italian operating system?
 

Offline Gino_09

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Re: $20 LCR ESR Transistor checker project
« Reply #3495 on: April 23, 2017, 09:50:41 PM »
Optocoppi or optoisolatore are good
https://it.m.wikipedia.org/wiki/Optoisolatore
But i think "Accoppiatore opt" is generic. There is no accented letter in traslation.
Encoding iso 8859-1 web utf-8
 

Offline hapless

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Re: $20 LCR ESR Transistor checker project
« Reply #3496 on: April 24, 2017, 07:57:33 AM »
Got it. Thanks.
 

Offline madires

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Re: $20 LCR ESR Transistor checker project
« Reply #3497 on: April 24, 2017, 07:17:40 PM »
 

Offline madires

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Re: $20 LCR ESR Transistor checker project
« Reply #3498 on: April 24, 2017, 07:25:48 PM »
Would someone like to sponsor one or two ST7920 based LCDs?
 

Offline esrtester

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Re: $20 LCR ESR Transistor checker project
« Reply #3499 on: April 24, 2017, 08:04:15 PM »
 


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