SW_OffButtonRPi

OFF-button on Raspberry Pi

If you do not intend to run your piTelex station with a RaspBerry around the clock, it is heavily recommended to use this option, to ensure to not mess up your SD-card, your linux-installation and last but not least your RPi. A power off button allows to shutdown the RPi properly before cutting the power

Important

For using this functionality it is important to enable the "secure power off" feature of the Raspberry Pi on first startup.

First, navigate to /boot/firmware/config.txt, then insert the lines below in section "[all]" right at the bottom of the document:

# Shutdown-button
dtoverlay=gpio-shutdown,gpio_pin=#

Replace '#' with the GPIO number to use, not the pin number. The GPIO pin numbering scheme is not in numerical order; see https://www.raspberrypi.com/documentation/computers/images/GPIO-Pinout-Diagram-2.png

(Contributed by Wolfram Henkel in telexforum.de)

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Jochen aka Horatius added the idea for debouncing the push button:

dtoverlay=gpio-shutdown,gpio_pin=<gpio_number>,active_low=1,gpio_pull=up,debounce=<time-in-milliseconds>

To shutdown the RaspberryPi, the button must be pressed and held for the debounce time given in ms (see https://www.telexforum.de/viewtopic.php?t=5190&start=50#p48899).