GitHub - lucsmall/Raspberry-Pi-Shutdown-Button: A script that allows the Raspberry Pi to be powered off from a push button (tactile switch)

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Raspberry Pi shutdown button
Luc Small
lucsmall.com
20150422

Watch the youtube video: https://youtu.be/Ns0JdZrXwdk

Waits for a button press and then shuts down Raspberry Pi

Momentary switch is connected between physical pins 25 and 26 on
the GPIO header

Script lives at:

/home/pi/off-button/

This script is added to crontab (with crontab -e) as follows:

@reboot /home/pi/off-button/wait-for-power-off-button.sh

All output goes to stdout and log file