$20 LCR ESR Transistor checker project

[theleakydiode]

Anyone else experienced these needing constant recalibration? That little underscore after the screen text keeps reappearing, I recalibrate it but it eventually comes back after testing few things.

I've got one of those blue EZM electronics studio branded units with firmware 1.11k.

[madires]

1.11k is quite old, Please update to 1.13k (https://www.mikrocontroller.net/svnbrowser/transistortester/Software/trunk/).

[theleakydiode]

Hi I don't have any way of doing this unfortunately, any ideas what would cause it in 1.11k?

[indman]

theleakydiode, how do you calibrate? From the function menu or pre-shorting 3 test contacts?

[madires]

I've received several requests to add support for the DHT11 and DHT22 (DHT21, DHT33, DHT44) sensors. The code is nearly done but I don't have any of those sensors for testing. So I'm looking for someone with DHTxx sensors who has some time and coding skills to help with testing and debugging. Alternatively, DHTxx samples would be also appreciated.

The code works well with the DHT11. Anyone with a DHT22 (RHT03, AM2302) or compatible sensor?

[indman]

Madires, Proteus has virtual DHT11-DHT22 sensors.
I can easily check their work on your fresh firmware.

[theleakydiode]

theleakydiode, how do you calibrate? From the function menu or pre-shorting 3 test contacts?

Preshorting the 3 contacts, this meter doesn't appear to support any other functionality or menus. It doesn't even have the extra modes that some people with this meter have where you hold the test button down for several seconds.

What hardware do I need to flash the new firmware onto this thing? Bearing in mind I have absolutely no experience with coding or microcontrollers what so ever.

1.11k is quite old, Please update to 1.13k (https://www.mikrocontroller.net/svnbrowser/transistortester/Software/trunk/).

What do I need to download from here? The tester looks like this, it actually has a socketed ATmega328 inside.

[timelessbeing]

What hardware do I need to flash the new firmware

Step #1: learning to search. Extremely useful skill for finding stuff on the internet.

All of this has already been discussed. I recommend opening this thread in single page mode ('Print' button at the top) and using the find function with some strategic keywords. Or use google with the "site:https://www.eevblog.com/forum/testgear/$20-lcr-esr-transistor-checker-project" parameter.

You might find things like this:
https://www.eevblog.com/forum/testgear/$20-lcr-esr-transistor-checker-project/msg810893/#msg810893

I have absolutely no experience with coding or microcontrollers what so ever.

Step #2: read the documentation

The answers to 90% of the questions in this thread are answered in the manual, which is mentioned hundreds of times. RTFM.
https://github.com/svn2github/transistortester/blob/master/Doku/trunk/pdftex/english/ttester.pdf

[madires]

What do I need to download from here? The tester looks like this, it actually has a socketed ATmega328 inside.

You could try the precompiled firmware from the mega328_2X16_menu directory.

[indman]

Madires, Proteus has virtual DHT11-DHT22 sensors.
I can easily check their work on your fresh firmware.

Madires, it wasn 't quite easy in Proteus, but the DHT11 and DHT22 sensors work perfectly!
Thanks!:)

[boffin]

I've gone back a number of pages, but what I'm looking for isn't readily available.

Is there a (wiki??) page somewhere that says
"For this Chinese Unit - here are the compile options".

I've messed around with trying to get new firmware on an Aliexpress special, and while it's kind of working, it immediately shuts off

[madires]

For the k-firmware there are precompiled firmwares for several clones and for the m-firmware settings for a few clones are listed in the Clones file.

[theleakydiode]

What do I need to download from here? The tester looks like this, it actually has a socketed ATmega328 inside.

You could try the precompiled firmware from the mega328_2X16_menu directory.

Thanks, so this would definitely not brick or damage the meter?

What hardware do I need to flash the new firmware

Step #1: learning to search. Extremely useful skill for finding stuff on the internet.

All of this has already been discussed. I recommend opening this thread in single page mode ('Print' button at the top) and using the find function with some strategic keywords. Or use google with the "site:https://www.eevblog.com/forum/testgear/$20-lcr-esr-transistor-checker-project" parameter.

You might find things like this:
https://www.eevblog.com/forum/testgear/$20-lcr-esr-transistor-checker-project/msg810893/#msg810893

I have absolutely no experience with coding or microcontrollers what so ever.

Step #2: read the documentation

The answers to 90% of the questions in this thread are answered in the manual, which is mentioned hundreds of times. RTFM.
https://github.com/svn2github/transistortester/blob/master/Doku/trunk/pdftex/english/ttester.pdf

Tried that but haven't found the answer. All I need is something cheap that'll work to flash the thing using the USB port, afterwards I suspect it'll be thrown into a drawer and forgotten about.

[timelessbeing]

  the answer is right in the link I provided. It doesn't get much cheaper than $2.

[madires]

You could try the precompiled firmware from the mega328_2X16_menu directory.

Thanks, so this would definitely not brick or damage the meter?

If your tester doesn't run with that version you can simply try another one. All those simple testers are based on the same design.

[indman]

Tried that but haven't found the answer. All I need is something cheap that'll work to flash the thing using the USB port, afterwards I suspect it'll be thrown into a drawer and forgotten about.

This kit will be enough for most AVR programming tasks
1.https://www.aliexpress.com/item/32670511994.html?gps-id=pcDetailBottomMoreOtherSeller&scm=1007.13338.128125.0&scm_id=1007.13338.128125.0&scm-url=1007.13338.128125.0&pvid=91a0b4c5-3df0-448d-9040-87c97a2f91b2
2.https://www.aliexpress.com/item/32657285482.html?algo_pvid=f4024e68-3546-4128-b2d7-8d4035d2f71b&algo_expid=f4024e68-3546-4128-b2d7-8d4035d2f71b-4&btsid=6f587a24-586c-4004-8673-b962220c4831&ws_ab_test=searchweb0_0,searchweb201602_2,searchweb201603_55

[ktgohdt125]

carelessly hook up the LCT tester to an undischarged 3uf 250vac cap and the LCR meter can't be power up anymore...

any fix to this or I got a burn out  Atmega 3289P???
 



attach a pic of my LCR meter with a suspected shorted smd fet/transistor... ( red circle )

any inputs are much appreciated...

thanks in advance.

[madires]

Most likely a zapped ATmega328. The component in the red cycle is a TL431 which is used as 2.5V voltage reference.

[ktgohdt125]

Most likely a zapped ATmega328. The component in the red cycle is a TL431 which is used as 2.5V voltage reference.

if i replace the 328chip, i need to flash it right?!

[madires]

Yes, and don't forget to set the fuse bytes.

[bingo600]

@madires

I need to update fw on my "Chinese M328-T3"
I was just checkking out the SVN repos & cloning via git 



I have a few questions:

1:
Why is the T3_T4 several revisions back ?
Has it been abandoned , for the T4_v2 ?


mfg
Bingo 

Hmm just found out the git repos lacks behind the svn repos (your latest fw is 1.34 in git)
Now i use svn - but still the T3/T4 is not at 811
svn://mikrocontroller.net/transistortester

I might be mixing the std fw (811) , and your 1.37m.
Will 1.37m work on a T3 ?  (provided i use the T3/T4 settings from the "Clones" ?

[madires]

Possibly a lapse. But you can use the Makefile from the subdir to compile the latest firmware. The mirror service was discontinued a while ago unfortunately, and therefore the mirror at github is outdated. 1.37m should run on a T3.

[Andbro]

Hi,

Do you know what is the difference between the LCR ESR T7 and T7H ?



thank

[indman]

Andbro https://www.aliexpress.com/item/4000070087557.html?spm=a2g0o.productlist.0.0.612d41a6tP9lxL&algo_pvid=2a63d2c8-4ab7-40b8-a1e7-6ee7ce2bc4d9&algo_expid=2a63d2c8-4ab7-40b8-a1e7-6ee7ce2bc4d9-1&btsid=f5042911-91af-4695-b3db-3042377c3381&ws_ab_test=searchweb0_0,searchweb201602_3,searchweb201603_55

[Andbro]

Hi,

Sorry Indman, i don't see the difference between the T7 and T7H.
Does a firmware is available for the T7?


Thank