I did get this working the use of a 5.0 volt arduino clone. I've been able to exchange one of the timers, so i am capable of get a smooth four khz pwm signal on digitalout 4. The fan responds nicely. Pid stands for proportional essential spinoff. I don’t completely apprehend precisely what goes on with this, but i do recognize that pid manipulate is quite a sophisticated and wise sort of control loop. They are used lots on unique motion and manipulate systems. You might imagine that a controller like this could just flip the fan on whilst the temp drops beneath a certain threshold and off when it is going above some other threshold. That is a totally basic kind of device, and could bring about regular up and down variant of the temp.