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    say goodbye to the arduino. Commented May 11, 2016 at 18:43
  • @MarkoBuršič Could you please state a possible cause? Commented May 11, 2016 at 18:51
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    I'm not going to write a speculative answer, but you've probably shorted 12V through to something and fried the comparator, the Bluetooth module, the ATMega328 serial pins if not more of it. If you remove the ATMega328 and connect the TX RX pins together on the Arduino, then send data through the serial monitor, do you see it coming back? If not, you've probably fried the serial pins of the ATMega32U4 as well. Commented May 11, 2016 at 19:27
  • Same here. I am pretty sure the damage was done when testing various things, never plugged a motor in AFAIK but it turns out capacitors on the wrong pin (eg D6) can sometimes send a spike back down into the USB chip and fry it. The actual 328P works fine in my other Arduino. Incidentally an out of spec 16MHz crystal can cause strange problems too. Commented Jan 28, 2018 at 6:33