I found this site http://www.farmhack.net/wiki/back-battery-arduino and it seems very easy.On the bottom of the schematics, there is written "to Arduino", that means VIN ?And at the top: This should go to Arduino's GND?
Hello,I added a picture how I imagine this how it will look like if its complete.Is it right?
maybe with some kind of digitalRead and two wires attached after the diodes? Any idea to do this?
they will be at least 1 volt over 5 VDC those pins are made for