TC1 lcr-meter transistor-tester fix

[SA]

Where to find the suitable fuse bits??

[madires]

For m-firmwmare: edit Makefile (MCU, clock, programmer) and run 'make fuses'

[tedris]

Hi i buy atmega324pa and i use usb programmer with  STC15L104W but not upload why? maybe in software chip not use?  is there software adaptape this?

[madires]

Have you followed the guide on https://github.com/atar-axis/tc1-u4? If the STC15L104W can't be programmed maybe it's also also bad. In this case go for the two-transistor circuit modification.

[tedris]

Hello, I don't understand, my Atmega processor is faulty, I will install software on it. Why am I dealing with stc15l104w? In the video I saw on the net, it was loading the Atmega processor. I tried as in the link provided, but I could not write stc in any way. I don't understand the other 2 transistor thing, it would be easier if there was a video or a card video. Thank you for your patient help.

[Kim Christensen]

tedris, if you want to program your Atmega processor, then you need to connect the programmer to J4 instead!

[tedris]

What will the connection pins be like? Can this be done with a programmer?

[Kim Christensen]

Not 100% sure, but I think this is the pinout for J4. (Got pinout from a TC1 schematic) Double check by ohm metering between J4 and the Atmel MCU.
(Reset, SCK, MISO, 5V, MOSI, GND)

What I did to program my TC1 was connect Reset, SCK, MISO, MOSI & GND to the programmer.  Then I temporarily jumpered out the test button to keep the unit powered up during programming.

[tedris]

I am using win11, could this be the reason? Were you able to do it in win11?

[Kim Christensen]

I used AVRDUDE on a Win10 machine using it's legacy serial port connected to a crude programmer that I temporarily built on a breadboard. (That programmer does not work with a USB --> Serial adapter)
Why? Because I'm cheap and haven't used Atmel chips for anything else. 

[tedris]

Can you send a picture? How did you do this, what did it look like? I bought 3 atmega324pa chips thinking that the legs would be short again. However, both programming it and finding the software is a serious problem. There is no software for T7, it will not return to its original state, I have no idea if other versions will work.

[Kim Christensen]

Sorry, I've already disassembled the breadboard and didn't take any pictures at the time. But it wouldn't have been much to see anyway. I simply built the programmer on the breadboard and connected it to my TC1 via grabber clips. A very temporary setup. I complied the binaries using WinAVR.