Determining windowSize for PID Library

Hi All,

I'm attempting to implement the PID library by Brett Beauregard in my temperature controlled aluminum plate (12" wide x 24" L x 0.5" thick). As you may have guessed, this is a very slow responding system.

In tuning this system, I am having trouble determining an appropriate windowSize value (Time Proportional Output value) for this slow responding system.

Any hints on how to determine a proper windowSize value?

Thanks in advance.

Perhaps you could help us out a bit? Where is this library?

Here is the link to the library

http://playground.arduino.cc/Code/PIDLibrary

That's the GUI stuff for the ControlP5 library as far as I can tell.

The windowSize is used as a time proportional output value, which is essentially the timeframe for a very slow PWM signal to the relay in this case.

I’m trying to get an idea of how to determine a suitable proportional output value as it has a big impact on the PID performance.