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+--- Thread: [PROBLEM] Fan control - GPIO pins not working (/thread-4087.html)
Fan control - GPIO pins not working - oz1sej - 26th Apr, 2020 10:46 PM
How does one control a fan under xbian?
I'm running Linux xbian 4.19.90+ #1 SMP PREEMPT Wed Dec 18 20:39:10 CET 2019 armv7l GNU/Linux on a Raspberry Pi 3. For all my other Raspberry Pi's, I've attached a fan for PID CPU temperature control which is PWM modulated via a GPIO pin through a python script. It works flawlessly on my other Pi's.
First thing I notice is that python says
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ImportError: No module named RPi.GPIO
So I try
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pip install RPi.GPIO
Turns out that pip is not installed. So I go to https://pip.pypa.io/en/stable/installing/ which says to run
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curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py
Turns out that curl is not installed. So I run
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sudo apt install curl
and then
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sudo curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py
and then
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sudo pip install RPi.GPIO
which gives me LOTS of errors. Then I say to myself: If I can just turn on the fan, at least I can cool the CPU. But it turns out that even
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sudo echo 1 > /sys/class/gpio/gpio17/value
gives me "Access denied".
How does one control a fan under xbian?
RE: Fan control - GPIO pins not working - Nachteule - 29th Apr, 2020 10:06 PM
Good question. Maybe you have to figure out first why sudo pip install RPi.GPIO creates a lot of errors
RE: Fan control - GPIO pins not working - the_redburn - 31st Aug, 2021 02:35 AM
For the record, the easiest way to install RPi.GPIO is with
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sudo xbian-config
To install a pre-release of RPi.GPIO, do
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sudo apt-get install python-dev
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pip install RPi.GPIO==[version]
By the way, 0.7.1a4 or later is needed for Raspberry 4 support.
I forgot to mention that root is currently needed on xbian for GPIO access.
See https://github.com/xbianonpi/xbian/issues/898 for non root access.