What is PID controller?
· A PID (Proportional - Integral - Derivative) is a control feedback mechanism widely used in industrial applications.
· A PID controller corrects the error between a measured variable (like analog values measured for heat, pressure, flow rate, chemical composition, cruise control in automobiles, etc.,) and,
· A desired set point by calculating and initiating a corrective action that can adjust the process accordingly and rapidly , to keep the error minimal.
The below diagram shows a simplified PID controller