An extremely simple application to control a PWM fan. Even under full load, keeps the RPi below 60 ºC!

First of all PWM needs to be enabled on the RPi:

Add dtoverlay=pwm,pin=18,func=2 (pwm/pwm-2chan docs) to /boot/config.txt to enable PWM Channel 0 on PIN 18.

Unsure, if it needs to be done once or if setup by RPPAL but I prompted the creation of pwm0 by running as sudo

echo 0 > /sys/class/pwm/pwmchip0/export

• Add support for other pins (currently Pin 18 is used)
• Add customizable fan curve
• Add TACH support, measuring incoming fan speed.

• RRPAL Examples
• DriftKing Fan Control
• This SO post