$20 LCR ESR Transistor checker project

[Andbro]

Hi Obelix,

It's not a GeekTeches boards. My other is ESR GM328A is a GeekTeches.
The rotary work very well.

Thanks

[chansw]

Hi, everybody!
I picked up a new firmware revision 790  from Karl-Heinz  for the device BsideESR02 and DTU-1701. In archive 2 firmwares with English language and a font 8x12 and 8x15, different in thickness. The bootpage for convenient use of a device is also a little edited.In the photo 2 different versions fonts of a firmware with Russian are only for evident comparing.

indman, how are you programming the firmware, are you desoldering the Atmega 328 and programming it out of circuit?

Jerry

[indman]

chansw,no, this photo will help you?

[N1cho]

hi guys please help

i running firmware that was given by perieanuo in this forum.  ver 1.29m  my tester uses atmega328p-pu ic.
I  tried to run adjustment from the menu half way it display error! now it always display battery? 2: 6mv sometimes 1: 6mv.
i try to reprogram my ic and still it show that same thing.
can anyone help? what's wrong?

btw if anyone have a newer version for this device care to share mine is using 8Mhz crystal.

thanks

[madires]

When the tester is trying to discharge a component but the voltage doesn't drop below a specific threshold (CAP_DISCHARGED, default value 2mV) then it will display that message stating the voltage. This may happen when connecting a battery or a charged cap with very high capacitance. In some cases it could be also caused by powering the tester from a SMPS or by a leakage current on the PCB (dirt?). Have you tested a film cap (100nF - 2.2µF) three times before running the self-adjustment?

[Andbro]

Hi,

I try with AVRDUDESS under windows to write FC for the extended fuse, but AVRDUDESS read always 0x04 ?

Thanks

[madires]

That's a known issue of avrdude's configuration file. Simply ignore it.

[N1cho]

When the tester is trying to discharge a component but the voltage doesn't drop below a specific threshold (CAP_DISCHARGED, default value 2mV) then it will display that message stating the voltage. This may happen when connecting a battery or a charged cap with very high capacitance. In some cases it could be also caused by powering the tester from a SMPS or by a leakage current on the PCB (dirt?). Have you tested a film cap (100nF - 2.2µF) three times before running the self-adjustment?

so what is the soloution? is my IC broke again?

or my tester broken?

anyway can i use a probe to test component instead of desoldering the component and put it on the tester?

thanks

[madires]

Have you tested a film cap (100nF - 2.2µF) three times before running the self-adjustment? Do you power your tester with a SMPS?

[stj]

use 220nF,
if you use 100nF and it's actually 97nF it will fail - it must really be 100nF or higher, using a 220nF eliminates the risk.
(yes, i learned the hard way!)

[indman]

Hi, madires!
I updated the file of Russian language var_russian.h for 1.36m.
I have a question - whether it is possible to move several variables from the variables.h file to the var_language.h file? It is about Tester_str, PWM_str, Hertz_str, CTR_str

[madires]

I have a question - whether it is possible to move several variables from the variables.h file to the var_language.h file? It is about Tester_str, PWM_str, Hertz_str, CTR_str

It's possible. I'll think about it.

[carrascoso]

Hello Madires.

I am looking for the file where this symbol is> flashing to try a small modification.
It appears when the meter starts at the beginning and if we turn the selector to the left we enter the menu.

Thank you

[madires]

The blinking symbol is meant to indicate that the tester is waiting for a key press to continue. The blinking is generated by TestKey() in user.c. The symbol is created by LCD_Cursor() in each display driver.

[carrascoso]

Then it is possible to replace the symbol> with something like this: <Menu / test>

Thank you

[madires]

Yes, for large displays. I'll put your idea on my to-do list.

[szpila]

Hi Madires.

Sending updated lang file for polish language.

[N1cho]

Have you tested a film cap (100nF - 2.2µF) three times before running the self-adjustment? Do you power your tester with a SMPS?

thanks

I used two serial li-on battery to power up my tester and 12v adaptor to charge the li-on and use the device while charging.
i finally remove the  svr5-04 and my tester work quite normal although sometimes it still display some test value when nothing is on the tester.

anyway the original firmware was 1.13k and i now used someone share to me 1.29m. i tried to recopy the original firmware but i guess it was lock.

i tried many other firmware but when i put the newly burn ic i just when blank i guess those firmware aren't compatible with my tester.

so anyone while to share a newer version, in english after 1.29m my tester use 8Mhz crystal.


thanks

[TheOnlyDocc]

Hello, I have a question.
I am searching for a new Component Tester. Because i play a lot with smd leds i would prefer a tester with pads where i can press the led against.
Like the ESR02PRO (https://www.aliexpress.com/item/32963716330.html?transAbTest=ae803_5&cv=34252583&ws_ab_test=searchweb0_0%252Csearchweb201602_9_10065_10068_10547_319_317_10548_10696_10084_453_10083_454_10618_10304_10307_10820_10821_537_10302_536_10843_10059_10884_10887_321_322_10103%252Csearchweb201603_53%252CppcSwitch_0&algo_pvid=7f8b7243-92ef-48fb-8459-0b37f823defd&af=3233883_389&cn=42prwg5wxc85dgqua3asv4n8zvbbo4ch&dp=v5_42prwg5wxc85dgqua3asv4n8zvbbo4ch&algo_expid=7f8b7243-92ef-48fb-8459-0b37f823defd-28&scm=1007.22893.125764.0&pvid=99db2b19-147a-4aff-bcf6-7e7385199e7e&onelink_thrd=0.0&onelink_page_from=ITEM_DETAIL&onelink_item_to=32963716330&onelink_duration=0.884661&onelink_status=noneresult&onelink_item_from=32963716330&onelink_page_to=ITEM_DETAIL&afref=https%253A%252F%252Fwww.aliexpress.com%252Fwholesale&aff_platform=default&cpt=1558517972474&sk=ccfBY4yg&aff_trace_key=5cfb6ab6e6a14ef899be78bd6ce2e025-1558517972474-02085-ccfBY4yg&terminal_id=a368af8ffbc342058a57d2acb432b91e.
In the past i used one of these https://www.aliexpress.com/item/32950131041.html?spm=a2g0o.detail.1000060.3.520e7bcbR3CFoI&gps-id=pcDetailBottomMoreThisSeller&scm=1007.13339.90158.0&scm_id=1007.13339.90158.0&scm-url=1007.13339.90158.0&pvid=b7a51194-cfa0-474d-ba2a-f3d814a2eda0 but without the case it did not survived the last move to my new apartment.
Is there another tester with smd pads that is better than the ESR02PRO.
Or is there a Contact PCB available to use with a TC-T7?
Which one is the better meter TC-T7 or ESR02PRO?
What is the difference between TC-T7 and TC-T7-H?
Sorry i know that i have a lot of questions!

[trinhvanthien]

Hi
How to adjust the bold and bigger fonts?

[madires]

For the ST7735 you can choose between FONT_10X16_HF, FONT_8X8_HF and FONT_8X16_CYRILLIC_HF (in config_328.h) at the moment. It's also possible to convert some other font. The font file structure is quite simple, but you need to create a few special characters manually (chars 0x01 - 0x07).

[mikerj]

A quick warning to others.

I recently ordered a kit version of the AY-AT tester from this ebay listing.

It came today and I was disappointed that the all the resistors were loose, rather than still in the paper tape. As a result I measured each resistor with a DMM rather than trying to read the markings. In the process I discovered that the key measurement resistors, which should have 0.1% tolerances, and which were color coded as having 0.1% tolerances were way way off!

The 3x 470K Ohm 0.1% resistors measure 487K Ohm 503K Ohm and 520K Ohm.  That's an error of 3.6% 7.0% and 10.6%!
The 3x 680 Ohm 0.1% resistors measure 671 (-1.3%), 661(-2.8%) & 674 (-0.8%).

It's odd, because none of the other resistors in the kit were anywhere near as far off.

I've requested replacements.

Has anyone else had a similar experience?

I'm not aware of any of the Chinese kits coming with precision resistors, it's one of the recommended upgrades.  Not really surprising for a $10 kit, since 1/4watt 0.1% precision through hole resistors are around $1 each.

Measure the output of the included 5v regulator if you intend to use it (another recommended upgrade),  the garbage supplied in my AY-AT kit was putting out close to 6v.

[trinhvanthien]

For the ST7735 you can choose between FONT_10X16_HF, FONT_8X8_HF and FONT_8X16_CYRILLIC_HF (in config_328.h) at the moment. It's also possible to convert some other font. The font file structure is quite simple, but you need to create a few special characters manually (chars 0x01 - 0x07).

Thanks so much for your replay.
Do you have a guide to creating it?

[madires]

Sorry, I don't have a guide about creating fonts. As a starting point please see bitmaps/font_8x8_hf.h. I think the GLCD Font Creator is able to create the right bitmap format (export as TFT / new GLCD). For linux/unix users I've written a small command line tool to convert bit and byte orders of a character bitmap (hexadecimal input and output).

[vivaT]

Madires I'd like to request including more than one Font and Symbol set or the ability to change the size, if its possible. With this feature a layout using big digits for Resistance, and Inductance along with small text for the other values like esr is possible

Ideally the screen space will be easier to read although I'm not a programmer, but tried to do this myself for the past couple of days with many head scratching moments, but no success.

I'm making a version of the LCR tester in tweezer form just for SMD parts and below is what my 0.96" 128x64 ST7735 screen looks like using the FONT_8x8_HF. Plenty of room for big digits using the Font_12x16_hf