PID Tuning by Hand: Fix Overshoot, Oscillation and Integral Windup

Your loop overshoots, hunts, or never quite reaches the setpoint. This path teaches you to fix it one Concept at a time. First you learn what the loop is made of: setpoint, measured value, error, controller output, and the thing it drives. Then you learn to test the process before you touch a gain: the step test, process gain, time constant, and dead time, and what each one tells you. You learn what the P, I, and D terms each do, how their units differ from one controller to the next, and why integral windup and derivative kick happen. You learn to read a trend chart and name what is wrong from the shape of the response. Then you tune: by hand, by the Ziegler-Nichols and Cohen-Coon rules, by lambda tuning, and with the auto-tune button, and you learn when each one fails. The last Concepts put it on real hardware: sample time, filtering, bumpless transfer, cascade loops, a heater, a motor, and a drone. Every Concept is short and checked with a question. You need algebra and a loop you want to tune. You do not need Laplace transforms.