PID function usage in Matlab (real life scenario)

Hi Guys I wonder if anyone can help please i am new to matlab : I need help with pid function in matlab (C = pid(Kp,Ki,Kd,Tf)) all examples in matlab or on google do not reflect real life output and input, just simulation . The scenario i am working on is to move a robot on the x axis , which means the y coordinates are zero all the time so it stays on straight line , ( I understand the logic, physics and maths of PID) just implementation using matlab I am finding it challenging, but this is part of learning of course )

Desired = u (zero y coordinates so the robot move on x-axis)

Output is measured by a sensor = y (is measured by a sensor and given the y axis coordinates as the robot move)

Error = u-y

All I need is a PID value that is continuous, so i can use it as an input to a velocity function so when PID is up or down it moves the left and right wheels can change velocity and direction for a differential drive robot . So as you see all i need is a PID value as the robot moves.

Thank you

Answer 1

[Rajat Tewari]

To find a value of that works for your robot model you can use PID Tuner app.

1. https://in.mathworks.com/help/control/ref/pidtuner-app.html
2. https://in.mathworks.com/videos/getting-started-with-simulink-part-4-tuning-a-pid-controller-1508444927396.html
3. https://www.youtube.com/watch?v=sFOEsA0Irjs

To understand PID controllers and their implementation (also includes real scenarios), refer to:

https://www.youtube.com/watch?v=wkfEZmsQqiA&list=PLn8PRpmsu08pQBgjxYFXSsODEF3Jqmm-y

Hope it helps.

[Haydar Jawad]

thank you Rajat