PI Controller

[leoncorleone]

Hello to all. First sorry for my poor English.
I have a question.
Actually I'm controlling speed of DC motor by LPC1768 and I need to a PI controller like below picture.

How could I program a PI controller in Keil. Is there any library for it, if not, what can I do?
Very thank you.

[rons]

Just search for the article "PID without a P.H.D.". It is also on embedded.com.

A PI controller is something you can do yourself with very little effort.

[soledad]

Hi Leon,

The DSP library for LPC1700 devices includes the below functions as you can check in the application note AN10913 http://www.nxp.com/documents/application_note/AN10913.pdf :

• Biquad filter 
• Fast Fourier transform
• Dot product
• Vector manipulation
• FIR filter
• Resonator
• PID controller
• Random number generator

For PI controller you need to implement your own algorithm, please check the following references. 

http://www.idc-online.com/technical_references/pdfs/civil_engineering/Universal%20Controller.pdf 

Feedback control system based on a remote operated PID controller implemented using mbed NXP LPC1768... 

I hope this helps.

Have a great day,
Sol

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