Home Home > 2013 > 03 > 31 > GPIO on Raspberry Pi
Sign up | Login

Deprecation notice: openSUSE Lizards user blog platform is deprecated, and will remain read only for the time being. Learn more...

GPIO on Raspberry Pi

March 31st, 2013 by

We have these working openSUSE Factory images for the Raspberry Pi, which is an ARM-based mini-computer, and since I want to encourage my kid to do more with computers than playing games (even if they are open-source), I looked into how GPIOs worked.
For that, you need to find the pin allocation – e.g.
in the elinux GPIO description or
http://www.raspberrypi.org/archives/1417
has a video which has it explained at 03:00

For my test, I wired together pin11 and pin12, which are GPIO17 and GPIO18.
I wanted GPIO17 to receive what is sent by GPIO18.
This is how this looked for me: foto of GPIO17 and 18 wired together

Using it directly from the shell is simple:
echo 17 > /sys/class/gpio/export
echo 18 > /sys/class/gpio/export
echo out > /sys/class/gpio/gpio18/direction
echo 1 > /sys/class/gpio/gpio18/value
watch -n 1 head /sys/class/gpio/gpio*/value

If the wiring and configuration was right, the “watch” will show gpio17/value to become 1 too.
You can then also pull the wire (or insert a physical switch) and see gpio17/value dropping to 0 again, when it is no more receiving the current from the other pin.

If you managed to get this working, you reached level one of hardware-hackery.

Both comments and pings are currently closed.

Comments are closed.