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.
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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– ikkuCommented Feb 7, 2013 at 12:04
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For the Raspberry Pi Model 3B+, and presumably everything else running the current OS, the default pin is now pin 4.– Bob BrownCommented Aug 23, 2018 at 17:16
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@Bob Brown I think the default was always GPIO 4 (which is header pin 7).– Eric LindseyCommented Oct 9, 2021 at 19:46
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2 Answers
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.
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Great answer. There is so much misinformation about this question out there. Simple, worked with Raspi 2+ and Raspi 3 with current Raspian.– choiseCommented May 23, 2017 at 16:23
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1Yea 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.– JoakimCommented May 24, 2017 at 14:38
Important remark
it must be exactly as indicated, without any space between parameters and values in the command
As written above in /boot/config.txt
dtoverlay=w1-gpio,gpiopin=x
