What is a PID controller and how does it function?
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A PID (Proportional-Integral-Derivative) controller is a control loop feedback mechanism widely used in industrial control systems. It adjusts the output based on the proportional, integral, and derivative terms of the error signal, which is the difference between a desired setpoint and a measured process variable. The proportional term addresses the present error, the integral term accounts for past errors, and the derivative term predicts future errors, providing a balanced and stable control response.