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About PID Controller Tuning: From Error Signal to Auto-Tuning

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How to make a feedback loop behave: what each PID term actually does to the response, how to read a step test, and how to pick gains with Ziegler-Nichols, relay auto-tuning, or manual loop-shaping. Finishes with the production-hardening details that separate textbook PID from a controller you can ship: anti-windup, setpoint weighting, derivative filtering, discrete implementation, feedforward, and cascade control.