[Homeroast] heat gun method

Tom Ulmer tom at transtate.us
Fri Nov 12 07:00:27 CST 2010

It seems to me it would take 3 or so different iterations of PID to get a
roast. If you really want to go madcap do the controlling with a HMI that
stores recipes. 

-----Original Message-----
From: homeroast-bounces at lists.sweetmariascoffee.com
[mailto:homeroast-bounces at lists.sweetmariascoffee.com] On Behalf Of Allon
Sent: Friday, November 12, 2010 4:04 AM
To: A list to discuss home coffee roasting. There are rules for this
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Subject: Re: [Homeroast] heat gun method

I've thought about setting up a heat gun with PID, using an infrared
thermometer as the temperature input (linear voltage or current).
I just wonder how well the PID algorithm, as implemented in the industrial
controllers I have, will deal with the variations induced by a hand-operated
method, whether it will compensate adequately for them, or will be thrown
off the rails.

Heck, I could just get one of these
and implement the PID algorithm on the microcontroller, plus an LED output
to show process and measured temperatures.

PID library here: http://www.arduino.cc/playground/Code/PIDLibrary


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