johnpeart / raspberrypi-safeshutdown

A script for initiating a safe shutdown on a Raspberry Pi when a button, attached to GPIO pins, is pressed.

raspberrypi-safeshutdown

A script for initiating a safe shutdown on a Raspberry Pi when a button, attached to GPIO pins, is pressed.

Installing the script

1. Get the git repository:
   git clone https://github.com/johnpeart/raspberrypi-safeshutdown
2. Change the permissions as the super-user such that you can execute the files:
   sudo chmod 777 /home/pi/raspberrypi-safeshutdown
3. Open rc.local in the text editor as the super-user:
   sudo nano /etc/rc.local
4. Add the following command before the exit 0 at the end of rc.local:
   sudo python /home/pi/raspberrypi-safeshutdown/safe-shutdown.py &
5. Reboot the Raspberry Pi:
   sudo reboot

NOTE: It is very important that you add the code in step 4 before the exit 0. If you don't, you'll cause terminal havoc.

Adding the hardware button

You will need an "Normally Open" ("NO") switch and some wire. You should:

1. attach a wire to each of the terminals on the button
2. attach the other ends of the wire to GPIO 3 and a GND pin (e.g. physical pins 5 and 6)

The benefit of using GPIO 3 is that it will also power on the Raspberry Pi when shorted to a GND pin.

Acknowledgments

Based on tutorial from Core Electronics