Orangepi Zero 2 PWM FAN control

How to control a PWM fan depending on CPU temperature on a Orange Pi Zero 2? You can use one of four built-in PWM. You don't need any libraries, only python.

TODO: rewrite python script to bash.

Prepare

1. Install Python 3.7 or higher.
2. Configure PWM on orangepi zero2. See section 3.20.5 in user manual

sudo nano /boot/orangepiEnv.txt

Add to the end of file pwm12 or pwm34.

overlays=pwm34

3. Reboot.

Install

1. Clone repository.

git clone https://github.com/Serjdud/orangepizero2_pwm_fan_control.git

2. Move to source

./orangepizero2_pwm_fan_control

3. Make sh script executable

sudo chmod +x ./fan_control.sh

Running

Run fan_control.sh with first argument = PWN nubmer. Wich PWM number you use depends on PWM pin. See picture above.

sudo ./fan_control.sh 3

To see other possible arguments run with -h argument

./fan_control.sh -h

Autolaunch on system startup

1. Move to source (for example orangepizero2_pwm_fan_control installed to orangepi user's home directory)

cd ~/orangepizero2_pwm_fan_control

2. Get full path to fan_control.sh

pwd

/home/orangepi/orangepizero2_pwm_fan_control

3. Copy the full path to the parameter ExecStart in fan_control.service and add PWM number argument.

sudo nano ./fan_control.service

ExecStart = /home/orangepi/orangepizero2_pwm_fan_control/fan_control.sh 3

4. Copy fan_control.service to daemon service folder (usually /etc/systemd/system/).

sudo cp ./fan_control.service /etc/systemd/system/

5. Reload systemd config

sudo systemctl daemon-reload

6. Enable service autolaunch on system startup

sudo systemctl enable fan_control.service

7. Start service end check

sudo systemctl start fan_control.service
systemctl status fan_control.service