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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