PWM Regulated Fan Based on CPU Temperature for Raspberry Pi

• Installation guide
• Configuration
• Calibration
• Add service
• Acknowledgment

Installation guide

Install packages:

sudo apt install -y git

Clone git repository:

git clone https://github.com/blenherr/pwmfan.git

Configuration

Change FAN_PIN to your used pwm pin in this files: calibration.py and fanctrl.py

nano ~/pwmfan/calibration.py

nano ~/pwmfan/fanctrl.py

Calibration

Use the calibration.py program to find the FAN_MIN value by running in the terminal:

python ~/pwmfan/calibration.py

Add service

Create fanctrl.service file

sudo nano /lib/systemd/system/fanctrl.service

Add following lines and change <your_user_goes_here> with your own user

[Unit]
Description=Raspberry Pi - PWM Fan Control
After=multi-user.target

[Service]
WorkingDirectory=/home/<your_user_goes_here>/pwmfan
Type=simple
Restart=always
ExecStart=/usr/bin/python /home/<your_user_goes_here>/pwmfan/fanctrl.py

[Install]
WantedBy=multi-user.target

Save and close

Enable service

sudo systemctl enable fanctrl

Start service

sudo systemctl start fanctrl

Acknowledgment

• https://www.instructables.com/PWM-Regulated-Fan-Based-on-CPU-Temperature-for-Ras