create a pid controller program in matlab

Creating a PID controller program in MATLAB involves the following steps:

1. Define the plant/system transfer function
2. Set the desired closed-loop response characteristics
3. Use the desired response characteristics to calculate the PID controller gains
4. Implement the PID controller using MATLAB's control system toolbox

Here is an example code that implements a PID controller for a first-order system:

main.m
% Define the plant transfer function
s = tf('s');
plant_tf = 1 / (s + 1);

% Set the desired closed-loop response characteristics
rise_time = 1.0;
overshoot = 10;

% Calculate the PID gains
[z, p, k] = pidparams(plant_tf, 'PI', rise_time, overshoot);
controller_tf = zpk(z, p, k);

% Create the closed-loop system
sys_cl = feedback(controller_tf * plant_tf, 1);

% Plot the step response of the closed-loop system
step(sys_cl);
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The pidparams function calculates the proportional, integral, and derivative gains based on the desired rise time and overshoot. The feedback function creates a closed-loop system by connecting the plant transfer function and the PID controller transfer function. Finally, the step function is used to plot the step response of the closed-loop system.

Note that this code is for a first-order system only and may need to be modified for higher-order systems.