PidController

The PID controller is every where - temperature, motion, flow controllers - and its available in analog and digital forms.

Why use it? It helps get your output (velocity, temperature, position) where you want it, in a short time, with minimal overshoot, and with little error. In many applications the PID controller can do the job - but as usual, with compromises. After a short intro to the PID terms and an example control system, you'll get a chance tune a PID controller.