I have been motivated recently to essentially fully rework the
control algorithm for my computer controlled poppery I. It had worked OK
before, but changing profiles turned out to be cumbersome, and recent
discussions of different profiles have made me want to have more
Well, this thing works really well now. after the drying stage
(to 230), I can control the actual coffee bean temperature ramp rate
directly. For me, this is a big win, since I controlled just the heater
air temperature before. While the heater air temp can be made to effect a
certain profile, changes in bean type, the weather, etc, caused
differences in the roast profile for the same heater temperature profile.
I'm sure many of you have experienced the same thing.
Changing the bean roast profile used to mean a trial and error setting of
a very complicated heater air temperature profile, typically two or three
segments for each segment of bean temp rate. Yuck.
Now I can directly program a bean temperature ramp rate, and get that rate
to within a roughly a couple of percent anywhere between less than 1
degree per minute to 60 degrees per minute. Complex profiles are very
easy to do, just set the rate and target bean temperature, then the next
rate and target temperature, etc. Using this thing is a delight, and I
think my coffee has improved, since my old approach had some problems near
Now if this thing just didnt use so much expensive
Proof of Principle Computer Controlled Poppery Coffee Roaster:http://home.columbus.rr.com/thegramilas/coffee/roaster.html(PS - the web page is before the improvements....)