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So, I have gone through everything twice just checking voltages. I thought for sure it was something on the header to the rPi. Question: How do you measure the high frequency signal at 3.3 volts on the headers? Oscilloscope? The new boards work perfectly BTW. Thanks. As an aside. This all...

OK after further review (and GTS (Google that S**t)) I started testing voltage all over the board. And then (I did read before) I noticed some components did not have solder all of the way through. Several on the AVR chip header/plug. I went back through and redid the soldering. No luck. I'm 99%...

Here is an image of the long plugs. At least I know this! Thanks! https://imgur.com/gallery/689gRt5

Guys, I truly appreciate the help. I just ordered a pre-soldered board. I do not have the knowhow to diagnose the problem. I do not know how to check VCC/GND and AVCC/GND. I do have a voltmeter :). I just do not understand why it worked, and then failed. I did try a different chip because I...

It is weird that it worked fine. And just trying different probes seems to have killed it. I looked over all of the solder joints. I tried another Atmega328-PU, but am not sure how to get it to be initialized by the rPi. I don't know enough to test the board. I think I made a fancy paperweight :(

Found how to push firmware. Does not work. Do I have an AVR chip problem? Downloading 'https://heatermeter.com/devel/snapshots/trunk/heatermeter.hex' Connecting to 104.223.92.144:443 Writing to '/tmp/hm.hex' /tmp/hm.hex 100% |*******************************| 64041 0:00:00 ETA...

OK I am a noob here. I got everything built. Up and working, and seeing temps with (some) probes. I got a thermocouple probe today, plugged it in and it worked. I was having some trouble getting a meet probe to work. I got Maverick ET 73 probe for temp and that was working fine, and showing...