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Homeroasters - Home Roasting Coffee Community » DATALOGGERS - CONTROLLERS - RATE OF RISE METERS » Dataloggers/Controllers/Rate of Rise Meters

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How to computer control Diedrich?
freddofrog	#1 Posted on 12/08/2016 11:45 PM
Newbie Posts: 2 Joined: November 11, 2016	Hi all I have access to a small gas Diedrich and wondering what is involved in making it computer controlled, ie Artisan automatically adjusts the gas flow based on bean temp. I have already done this to my Behmor but Behmor is electric not gas. Thoughts? ff


btreichel	#2 Posted on 12/09/2016 4:01 PM
1/4 Pounder Posts: 185 Joined: May 07, 2007	I've been thinking about a stepper motor attached to a gas valve controlled via an Arduino.


BenKeith	#3 Posted on 12/09/2016 4:14 PM
Pounder Posts: 485 Joined: April 21, 2014	I think if you do a search, not too long back, someone posted a whole bunch of info using a TC4 and it's PWM to control a gas valve and the gas valve they used. I think AllenB was fairly involved with it and he may have some good info on it.


oldgearhead	#4 Posted on 12/10/2016 10:00 AM
1 1/2 Pounder Posts: 1128 Joined: February 10, 2011	Yes an Allen Bradley PLC (pun intended) is the way I would go. Probably a used SLC504 unless I wanted to network it. Use an analog gas valve, 4-20 ma I/O, and a few digital circuits as needed...you will have a bunch of PID loops to choose from and the powerful "scale with parameters" instruction...hint - write your own PI control. Edited by oldgearhead on 12/10/2016 10:09 AM No oil on my beans...


freddofrog	#5 Posted on 12/13/2016 2:53 AM
Newbie Posts: 2 Joined: November 11, 2016	Yeah, I saw threads on controlling a gas value using PWM but I'm not sold on the concept. PWM for electric heaters I get but I would have thought gas valves need a proportional control like a servo motor. I'll have a look again and see.

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