This post is in a series of ones published a long while ago in another blog of mine, which I will be revisiting here. We will be seeing how to use PWM with Arduino.

The code for the control of a fan with Arduino is here: https://github.com/FritzenLab/PWM-Arduino-fan-controller

The video on PWM is here:

Also, want to learn how to control digital output of Arduino? see here.