larsks / gpio-trigger Goto Github PK

This is a systemd unit for triggering actions based on GPIO events. It uses the gpio command from the wiringpi package to wait for events.

Run make install. This will:

• Place [email protected] in /etc/systemd/system
• Create /etc/gpio-triggers if it does not exist.

Create a file in /etc/gpio-triggers named after the BCM GPIO pin number. This file may set any of the following variables:

• GPIO_COMMAND (required) -- the command to run when the even is triggered.
• GPIO_PULL (default up) -- this may be up, down, or tri.
• GPIO_DIR (default falling) -- this may be rising or falling
• GPIO_DEBOUNCE (default 1.0) -- the number of seconds to wait after triggering an event before triggering the next one.

For example, if I want GPIO4 to trigger a restart, I would create /etc/gpio-triggers/4 with the following content:

GPIO_COMMAND='reboot'

To enable the service, run (as root):

systemctl enable --now gpio-trigger@4

This will trigger a reboot when you connecto GPIO4 to ground.