7

By default the header Pin Nr. 7 us used by the 1-wire kernel module.

I would like to change it to a one of the 4 new GPIO Pins of an Rev 2 Pi.

  • The kernel code for bitbanging 1wire on the RPi is a bit messy at the moment, multiple implementations exist. But unless I missed something completely, the only way to change this pin at this moment is to recompile the module, a name that keeps popping up in this context is 'Frank Buss', see for example this thread on the RPi forum – ikku Feb 7 '13 at 12:04
  • For the Raspberry Pi Model 3B+, and presumably everything else running the current OS, the default pin is now pin 4. – Bob Brown Aug 23 '18 at 17:16
5

To change the default GPIO pin used for 1-wire communication you can edit the /boot/config.txt file and add this line:

dtoverlay=w1-gpio,gpiopin=x

where x is the GPIO pin you want to use. Reboot to see the change.

  • Great answer. There is so much misinformation about this question out there. Simple, worked with Raspi 2+ and Raspi 3 with current Raspian. – choise May 23 '17 at 16:23
  • 1
    Yea it took me a while to find this out myself, the incorrect answers out there is what prompted me to answer this question to begin with. – Joakim May 24 '17 at 14:38
1

Important remark: it must be exactly as indicated, without any space between parameters and values in the command: dtoverlay=w1-gpio,gpiopin=x

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