Hi there. I made a simple 16x2 LCD TTester a few days ago based on the schematic provided in the pdf file from github. it looked like the attachment. then, as I read there, I could use a relay extension for more safety. I modified the circuit a little based on the instructions(the other attachments, just leaving the voltage reference out and connecting a relay) and made a quick PCB. the problem is: 1) using an atmega8 using the flash and eeprom in the trunk mega8 tester works flawlessly. absolutely right. relay working, values calculated perfectly. 2) using an atmega328 using the flash and eeprom in the trunk mega328 it doesn't work at all. I played a lot with the makefile and many recompiles, no luck. when it starts up, it just shows some random blocks on the LCD. if I leave it for a few minutes, some random test procedures pop up which don't respond to anything. e.g. when it says connect probes together, and I connect them. nothing happens. what could be the problem ?
Attached files:
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ttester_original.jpg
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ttester_relay.jpg
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Try adding -v to compiler flags and have a close look to the compiler output. Is it realy Mega328 you are compiling for?
Carl D. wrote: > Try adding -v to compiler flags and have a close look to the compiler > output. Is it realy Mega328 you are compiling for? I used the prebuilt hex/eep files in the folder mega328. anyway, I added a -v to CC (it's applied in the attached makefile). it compiles with just a warning : ../make_frequency.c:11: warning: 'wish_freq' may be used uninitialized in this function. I went to source file, despite there was no problem as the values were explicitly applied to that variable, there was a commented out line which gave it a initializing value of 1. so I uncommented it and the warning dissapeared. I tried the newly compiled, and it was the same problem. a few minutes of nothing on screen. then the self calibrating test from T1 start (with telling me to short probes). the self calibrating test doesn't end ( I go to that level which wants me to use a 220nF capacitor for calibration). it is stuck after that. I'm gonna disable self tests to see what happens.
Attached files:
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AVR_tester_schema.jpg
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your circuit is wrong, i was design new circuit that works perfectly
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