Originally forked from Howchoo, Thank you Howchoo.

pi-power-button

Scripts used in our official Raspberry Pi power button guide.

Installation

1. Connect to your Raspberry Pi via SSH
2. Clone this repo: git clone https://github.com/Howchoo/pi-power-button.git
3. Optional: Edit line 9/10 in listen-for-shutdown.py to your preferred pin (Please see "Is it possible to use another pin other than Pin 5 (GPIO 3/SCL)?" below!)
4. Run the setup script: ./pi-power-button/script/install

Uninstallation

If you need to uninstall the power button script in order to use GPIO3 for another project or something:

1. Run the uninstall script: ./pi-power-button/script/uninstall

Hardware

A full list of what you'll need can be found here. At a minimum, you'll need a normally-open (NO) power button, some jumper wires, and a soldering iron. If you don't have a soldering iron or don't feel like breaking it out, you can use this prebuilt button instead.

Connect the power button to Pin 5 (GPIO 3/SCL) and Pin 6 (GND) as shown in this diagram:

Is it possible to use another pin other than Pin 5 (GPIO 3/SCL)?

Not for full functionality, no. There are two main features of the power button:

1. Shutdown functionality: Shut the Pi down safely when the button is pressed. The Pi now consumes zero power.
2. Wake functionality: Turn the Pi back on when the button is pressed again.

The wake functionality requires the SCL pin, Pin 5 (GPIO 3). There's simply no other pin that can "hardware" wake the Pi from a zero-power state. If you don't care about turning the Pi back on using the power button, you could use a different GPIO pin for the shutdown functionality and still have a working shutdown button. Then, to turn the Pi back on, you'll just need to disconnect and reconnect power (or use a cord with a physical switch in it) to "wake" the Pi.

Of course, for the GND connection, you can use any other ground pin you want.