kris duff wrote:

> I'm looking for some sample code for a PID controller (mplab C) which
> will control a very slow heater.  I think the oscillation of the system
> will be about 20mins. 
> 
> Do somebody could give me some PID sample code or good website.  I used
> a pid controller on the website : "pid without a PHD".  But, I'm not
> sure it's good for my usage.

Have you looked at Microchip's AN964? <http://tinyurl.com/2zyk7w>

It may not be in C, but if it's in assembler, it should be easy to port it
to C. They may have more about this.

Gerhard

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