I've battery powered device with ATmega inside. I'd like to put a protection diode on power to protect it from me accidentially switching battery backwards. Here comes questions: Is one diode (either on Vcc or GND) is enough? Which one to choose? What type of diode to choose (voltage etc ratings)? …

How to choose a protection diode (power)

system December 16, 2010, 11:50am 4

Depends, but usually below 0.5V, sometimes even below 0.2V

Korman