Products > Test Equipment

Uni-T UT139c LCD biasing and other mods

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xeezawaki:
I tried to do this mod with a UT139C and it worked with almost no setup :)

I adjusted the LCD biasing and prevent the backlight to auto turn-off.

I soldered header pins on the board, connected pins to Arduino as shown by @KBird, read the sketch of @frozenfrogz , try to understand what was doing and what was going to happen, uploaded et voilà. Done.

I have a question as I'm quite new on this: the methods that do the bit write are into the loop(). I'm not sure if I did the correct thing, but I waited for two loops (one to see the dump before, and the next to see the dump after and check if bytes were written), and after all bitwrite functions executed i pulled out the 3v3. Did I act correctly or are there less agressive ways to break or stop the loop once everything is done?

Thanks to all people that investigated and made this possible, btw. :) 

rogbese:
Hello!
I have the ut139c and I love it. I do electronics and basic electricals. I ordered the ch341a mini programmer and soic8 clip. I will be using the accompanying app. I have ZERO knowledge of hex bit I want to extend the power off time and set the backlight to manual.

I would really appreciate it if someone here could please tell me what addresses to look for and values to change to, to achieve this.

Thanks in advance all... 🙋🏾‍♂️

Kbird:
See Reply No#25 , there are links to more info I used there ie to FlyWheelz Post.

WARNING : 

MAKE VERY SURE to save the Existing Hex dump in case you need to recalibrate the Meter in the future...this info is UNIQUE to YOUR METER....

rogbese:
Hello again.

My test clip just arrived and the attached is what i got from the meter.
I just need manual backlight control.
Any help would be greatly appreciated.
And yes, I made a backup already!

Thanks in advance  :)

rauldm:
Hi have a new revision of board for this meter, I like it, now multimeter chip and eeprom are located in rear circuit board,  only removed rear cap for access.

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