Does a PID controller is just a programming concept or a physical device ?

[aruns11152]

I want to implent the PID controller along with the ATMEGA 16 and I don't know how to implement it along with the microcontroller?
I have confusion whether it is just a programming concept or it is a physical device which I have to use it along with the microcontroller with the motor driver?

 

[ahmad1954]

both of them. you can implement it with software or hardware in your need. below links may help you to understand:
http://en.wikipedia.org/wiki/PID_controller
http://www.ecircuitcenter.com/Circuits/pid1/pid1.htm

 

[FvM]

PID is a signal processing function, it can be implemented in microcontroller software.