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These are the ramblings of Matthijs Kooijman, concerning the software he hacks on, hobbies he has and occasionally his personal life.

Most content on this site is licensed under the WTFPL, version 2 (details).

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Raspberry pi powerdown and powerup button

Raspberry Pi Zero

TL;DR: This post describes an easy way to add a power button to a raspberryp pi that:

  • Only needs a button and wires, no other hardware components.
  • Allows graceful shutdown and powerup.
  • Only needs modification of config files and does not need a dedicated daemon to read GPIO pins.

There are two caveats:

  • This shuts down in the same way as shutdown -h now or halt does. It does not completely cut the power (like some hardware add-ons do).
  • To allow powerup, the I²C SCL pin (aka GPIO3) must be used, conflicting with externally added I²C devices.

If you use Raspbian stretch 2017.08.16 or newer, all that is required is to add a line to /boot/config.txt:

dtoverlay=gpio-shutdown

Make sure to reboot after adding this line. If you need to use a different gpio, or different settings, lookup gpio-shutdown in the docs.

Then, if you connect a pushbutton between GPIO3 and GND (pin 5 and 6 on the 40-pin header), you can let your raspberry shutdown and startup using this button.

All this was tested on a Rpi Zero W, Rpi B and a Rpi B+.

If you have an older Raspbian version, or want to know how this works, read on below.

See more ...

 
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Copyright by Matthijs Kooijman