Is there a way to switch on and off the arduino with a simple button and a transistor? I came out with the following schematic (attachment). (on) Would be an output PIN of VCC when the arduino starts (so you don't need to keep pressing the button, because the arduino does that job) (off) Would be…

Transistor + Arduino (Extream sleep mode of 0mA)

jremington April 11, 2014, 3:01am 11

Pololu has a nice little MOSFET pushbutton power switch that seems to do just what you want: Pololu Power Switches

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