I bought a new Arduino micro in december and it worked fine. I made a PCB for it on which i can plug in the micro (like a shield)
Now, I was using the board and it worked fine for about 2 weeks. Suddenly yesterday, I noticed that it refused to connect to Serial monitor and refused to upload.
I took out everything and found out that the 5V and GND on the micro were shorted (had 34 ohm resistance between them). I was powering the micro with 5V from a LM7805 with an input of 12V. The output was fairly stable (within errors of 7805) 4.7-4.9V. The whole board in general was working fine.
I was wondering if there was something wrong that I was doing or is this some random coincidence where maybe on of my wires shorted with something.... I have another Micro, but am hesistant to put it on and start, as I think it may burn also.
Is it possible that the voltage regulator on the micro has become bad ? If so, how do i test it out ? Any suggestions as to what might have happened ?
I was running a L298 (a motor and a relay with it) and also had multiple switches attached to it. And an IR sensor, (was using it for robotics purposes.)