PC cooling controller for rotary cooling devices (fans/pumps). It has the following features: Supports 4 cooling devices. Can disable devices that still run on minimal PWM. Monitors devices RPM. RPM measurement supports pulse stretching. Supports 2 thermal sensors. Error signal output. Can be controlled/queried over RS-232 interface. Command-line client to query/debug/control the device. Hardware design and source code is MIT-licensed.