Simple C program to manipulate 5V fans with raspberry pi pico (or replica)
Tested with "ASUS FCN FNQG" fan
May or may not work with yours
Inspect file for changes and run in project's root directory:
chmod +x ./build.sh && ./build.sh
and your uf2 executable should be in ./build/src/5vpwm.uf2
dont ask why it looks like this
Tach (yellow) (reporting) wire is not utilized
Closely inspect your fan's wires to connect everything right