I'd like to use a PIR sensor (HC-SR501) to control the power to an Arduino Uno. Note that I'm not talking about using a PIR sensor as input to the Arduino and sensing the output pin from the PIR, I'm talking about using the output pin from the PIR to turn the Arduino itself on and off.
Hooking it up directly doesn't seem to work as I'm guessing the PIR doesn't handle that much current output. Would I use a transistor of some kind to do this?
My reason for wanting to do this is simple, power preservation. The PIR uses so little current when it doesn't sense anything that I thought it would be nice for something like a mailbox sensor that doesn't need to run that often. Thanks.