Hello there, I am new to Arduino and electronics in general, so I hope you can bear me :confused: :).
So, what happens if I sent a high voltage from an I/O pin directly to the ground pin? Could this damage the board even at 40mA? I understand the output of that pin is from the microprocessor .... but who is in danger here? the microprocessor, the busses or what?
Also, why short circuit is dangerous? Is it because the current is too high and it should be consumed a bit, then travel back to the ground or I got the whole idea wrong.