Raspberry Pi Poweroff Script

This creates a power off script on a Raspberry Pi and sets it up to run at boot. It allows you to power off your Pi (sudo poweroff) at the push of a button on pin 5 (GPIO3). Pushing the button again will cause a wake from the poweroff state, so this will function as a power on/off button. It won't truly cut the power, but a Pi in the poweroff state draws very little current.

Notes:

1. The script is written to avoid accidental presses of the button and requires you to hold the button down for 0.5 seconds. A momentary button should be used.
2. You can use a different pin for power off by changing the script, but only pin 5 (GPIO3) will work to wake the Pi back up from the poweroff state. This is built into the Pi.
3. You will need to make setup.sh executable (sudo chmod 777 setup.sh) in order to run it.