Library Concept
PID controller
A control algorithm that corrects a system's error using three combined terms — proportional, integral, and derivative — the standard formal method behind most feedback control.
A feedback control algorithm that computes its correction from three combined terms: proportional (the current error), integral (the accumulated error over time), and derivative (the rate at which the error is changing) — a formulation flexible enough to correct steady offset, not just instantaneous error, without overcorrecting. Nicolas Minorsky published the first rigorous three-term analysis in 1922, developed for automatic ship steering and modeled on how a human helmsman actually corrects a course, and it remains the standard general-purpose algorithm behind a servo’s correction.