tune a pid controller in matlab

Here's a sample code for tuning a PID controller in MATLAB using the 'PIDTuner' app:

main.m
% Define your plant model
s = tf('s');
P = 1/(s^2 + 2*s + 1);

% Launch the PIDTuner app
pidTuner(P);

% Adjust the PID controller parameters using the app

% Once you are satisfied with the tuning, export the controller
C = pidtune(P,'pidf');

% Simulate the closed-loop response
T = feedback(C*P,1);
step(T);
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In this example, we define a simple second-order plant model P and launch the PIDTuner app to adjust the tuning of a PID controller. Once we are satisfied with the tuning, we export the controller as C and simulate the closed-loop response to a step input using the feedback function.