pid controller design in matlab

Here's an example of how to design a PID controller in Matlab using Simulink:

main.m
% Define the plant you'd like to control with PID
s = tf('s');
G = 1/(s*(s+1));

% Set the PID controller gains
Kp = 1.2;
Ki = 1;
Kd = 0.1;

% Create the PID controller 
C = pid(Kp, Ki, Kd);

% Connect the plant and controller together in a closed-loop system
sys_cl = feedback(G*C,1);

% Plot the closed-loop step response
step(sys_cl)
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This code defines a transfer function G for a simple plant, creates a PID controller with gains Kp, Ki, and Kd, and uses Simulink's feedback function to connect the plant and controller in a closed-loop system. The resulting step response of the closed-loop system is then plotted using step.

You can modify the values of Kp, Ki, and Kd to tune your controller to better meet your control specifications.