To my /boot/config.txt on Raspberry Pi Model B I added:
dtoverlay=gpio-shutdown,gpio_pin=3,active_low=1,gpio_pull=up
Right now nothing happens when i shorten GPIO#3 with ground.
What else needs to be done to make this overlay work: software- and/or hardware-wise?
The "documentation" for gpio-shutdown is rather obscure.
I have used gpio-shutdown to implement a shutdown button (although I use GPIO5 - pin 29 as I use the default for I²C).
The "documentation" does not explain what happens in another pin is used - it does state "This overlay only handles shutdown".
Pin 5 USED to perform a restart on older Pi - See Will pulling pin 5 low will make the pi boot up again but this does not seem to work.
Update Pin 5 WILL restart;
gpio-poweroffhad disabled it.
Name: gpio-poweroff
Info: Drives a GPIO high or low on poweroff (including halt). Enabling this
overlay will prevent the ability to boot by driving GPIO3 low.
Indeed there seems to be little point in modern 40 pin Pi - which have a dedicated Run input which can be used to restart the Pi.
PS If you are using the default ,active_low=1,gpio_pull=up seems unnecessary as there is an external pullup, and active_low is the default.
dtoverlay=gpio-shutdown,gpio_pin=3 is enough?
– madneon
Jan 18 '18 at 10:34
,gpio_pin=3 which is the default (but a poor choice as it is used for I²C).
– Milliways
Jan 18 '18 at 10:56
Go to this link and search for 'gpio-shutdown', it will give you steps to implement the gpio shutdown: https://www.stderr.nl/Blog/Hardware/RaspberryPi/PowerButton.html
dtoverlay=gpio-shutdownshould behave the same. – Matthijs Kooijman Apr 30 '18 at 10:21