How to build PID controller with Arduino UNO?

I want to control a DC motor with PID controller by using Arduino UNO board and simulink. i write the code as pic attached, and i found the when the ref. value was 0 the motor run and physically it's wrong. PIN 0 Reference value : from variable voltage source 0~5 VDC PIN 1 Feedback : from speed sensor 0~5 VDC PIN 5 output : to motor drive

please any help or example to how i use pid in smulink with arduino.

Answer 1

[Madhu Govindarajan]

Here is a link that shows how to do PID control on DC motors using Simulink - http://www.mathworks.com/help/supportpkg/arduino/examples/drive-with-pid-control.html

If you think the motor is running when the input is zero, can you confirm that the input is actually zero by connecting an oscilloscope to the pin?

Answer 2

[Adrian Fleck]

But how is it possible to control an proces without simulink and an pid contoler (with code) ?