i tried editing firmware ComponentTester-1.34m to work with my TC1 (atMega324PA) Tester, i used TC1-Mod circuit as suggested, so no more STC15W104 chip. the problem is immediate exit (power off) after measurement (or no component), problem similar to...
* once online the device is testing and so on, afterwards it says IMMEDIATELY 'bye' - there is no delay, you cannot even read the values
in page 204...
Sounds like a problem with the test push button at PD1. When not pressed it should be a high signal, and low when pressed. Does the mod create the correct logic levels?
you nailed it, thank you! there somekind of leakage making Q2 to always turned ON even if button is not pressed, the solution is i added 100KOhm pull down on the Q2's base. earlier is even worse, Q1 is always ON, it turned out leakage on smd capacitor C13 on the TC1 pcb, so i removed it and now it works. attached is my mod... Q1 and Q2 is 2N3906 and 2N3904 if that matters.
now the tester function as it should, 5 times testing no component, and then turned off. similarly when testing component, transistor for example, it will cycle indefinetely around 3 second each cycle, this is a bit annoying esp when we want to write down components parameters on paper. my M328 tester (now with my brother) is better, it will test component, and it stay there on the output result for longer time. can you direct me on the code how to adjust timeout if component is detected, so its like. if component detected, cycle timeout = say 10 seconds, but if no component, timeout is 3 seconds. or else, how the M328 function?
another thing, there are corrupted image on the right side of my screen, and random garbage on left and top part of the screen, see 2nd attachment. can this be fixed? thanks for your help.