Page 1 of 1
Posted: Sat Aug 20, 2011 10:35 am
What is the purpose of d1?
Posted: Mon Aug 22, 2011 8:53 am
From the RBBB documentation:
In the RBBB the diode provides reverse polarity protection on the 5 volt power rail. Under normal circumstances the diode does nothing. If the power is connected with polarity reversed, the diode shorts out the power supply. This protects the Atmega 168 from exposure to the reverse polarity voltage which would damage it.