Raspberry Pi GPIO PWM fan controller
A program that uses the hardware PWM of a Raspberry Pi's GPIO 18 pin to properly control a 5V fan. Currently it's just a quick test that uses the rppal crate, but in the future this project is supposed to be a daemon that features:
- A fan curve (X: temperature; Y: duty cycle)
- IPC/pseudo files to read and set stats during runtime
- Dedicated daemon user (does not run as root, daemon user is priviledged, e.g.
gpiogroup) - Support for Systemd, OpenRC and runit
- Automatically check if
/boot/firmware/config.txtis configured correctly
This is sufficient for my needs, but here are some things I might add to this project:
- (Point out that the fan can technically be any voltage as long as the MOSFET gate switches with just 3.3V and supports the fan's voltage)
- Make use of the second hardware PWM channel (e.g. secondary fan)
- Read the tach value on 4-pin PWM fans
runfs structure:
/run
├── rpi-fanctl
│ ├── rpi-fanctl.pid
│ └── rpi-fanctl.sock