I'm working with a nano 3.0.
I had a project working on a breadboard and the build a permanent version on some perf board.
I'm powering the arduino with 12V.
When I plugged the nano into the new board and powered it up nothing happen. I tried to upload new code but I got the "avrdude: stk500_recv(): programmer is not responding" error.
I then noticed that the ATmega chip was really hot.
Upon further investigation I discovered that there now continuity between the +5V pin and ground pin (I assume it was not there before).
So it appears my new board is miss-wired and it fried the nano, however, I can't seem to find any mistakes on the board.
Could someone please suggest what might have caused this problem given the short and the heat, so I can try to find the problem on the board.