March 5, 20242 yr Hello I'm running the NAS on Orange PI 5. I've run Armbian with EDK2 from https://github.com/armbian/build/pull/5900. The system starts from SSD disk connected via PCIE card with 4 SATA ports. I wanted to run simple fan control via GPIO, but setting the value 1 or 0 on GPIO has no effect and the multimeter connected to GPIO always shows 2.85V. How I did it. I installed wiringOP as the manual says. I selected GPIO 0 and entered the commands gpio mode 0 out gpio write 0 0 I connected a multimeter to GPIO 0 but it always shows 2.85V when I did gpio write 0 1 the multimeter also shows 2.85V gpio readall shows 1 in column V when "gpio write 0 1" command is shows 0 in column V when "gpio write 0 0" command is Does anyone have an idea what I'm doing wrong?
March 5, 20242 yr you can't use GPIO as power supply for fan, this will break the gpio bank. you can use GPIO as ON/OFF switch for fan, you should use "gpio-fan" driver. https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/Documentation/devicetree/bindings/hwmon/gpio-fan.txt?h=v6.7.8 by this you can use /sys/class/thermal/cooling_deviceX/state control you fan, but if you want to system automatically enable your fan at certan temperature, you need register the fan as a cooling device, for cpu/gpu or hard driver. https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/Documentation/devicetree/bindings/thermal/thermal-cooling-devices.yaml
March 5, 20242 yr Author Thank you for your answer. Sorry, I didn't write this, but GPIO is sterring the fan through a transistor. I will check it on a newer version of the distribution, the one I have is the beta version. Maybe that's the problem.
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