HomeRoast Digest


Topic: PID iRoast (8 msgs / 137 lines)
1) From: Allon Stern
Alright, I got the iRoast pid'ed.
This is nothing like it's gonna be once I get the case built for everything; I have the SSR currently bolted to the back of a junction box that's going to hold the outlets and dimmer for the fan control (currently controlled with the variac).
My first roast wasn't too bad - I wanted to see how a light roast would turn out - I terminated the roast at 435 degrees. It's Ethopian Jimma-Nigusie Lemma.
Here's a picture of this PID C+ roast (left) versus an earlyer heatgun FC/FC+ roast (right) that I'm currently resting for SO espresso:
The next step is to toy with the profiles and experiment with reaching the same level of roast in different ways. Ought to be fun :-D
-
allon
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2) From: Scott Miller
The light roast appears to be pretty uniform. Is that bean wet processed?
cheers,
Scott
On Tue, Sep 28, 2010 at 12:33 AM, Allon Stern  wrote:
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3) From: miKe mcKoffee
Jimma is a (phenomenal) Natural process Ethiopia.
miKe 
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4) From: Allon Stern
On Sep 28, 2010, at 7:41 AM, Scott Miller wrote:
<Snip>
Nope. It's the Ethiopian Jimma-Nigusie Lemma:
-
allon
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5) From: Tom & Maria - Sweet Maria's Coffee
Wow - amazing set up. I wish they had continued to develop the iRoast 
along these lines because I think the basic roast chamber design is 
ideal. Greater control, separate fan speed and heat control in manual 
modes ... that's the ticket. Of course, I don't think your rig will 
pass UL !
-- 
-Tom
"Great coffee comes from little roasters" - Sweet Maria's Home Coffee Roasting
               Thompson & Maria -http://www.sweetmarias.com     Sweet Maria's Coffee - 1115 21st Street, Oakland, CA 94607 - USA
             phone/fax: 888 876 5917 - info_at_sweetmarias.com
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6) From: Allon Stern
On Sep 28, 2010, at 1:15 PM, Tom & Maria - Sweet Maria's Coffee wrote:
<Snip>
What tipped you off, the exposed 120V wiring?
(note, I have a fire extinguisher near the roaster, out of frame)
Now all I have to do is learn how to compose profiles for different characteristics in different beans. Lots of knowledge to amass.
The fun thing is that I'm going to end up with a box that contains a PID, SSR, dimmer, outlets labeled for HEAT and FAN, and a plug for thermocouple - basic roaster control-in-a-box.
I may expand this to include an arduino with separate thermocouple input (or if I can copy the output from the PID, do that) for data logging; the arduino can take inputs from the PID which puts out a 1 second pulse when hitting program stages, or at program end. Then I can trigger actions, such as dumping beans, or whatnot, depending on what I come up with.
You know, speaking of non-UL listed, this PID would be a lot of fun with the Quest M3.....
-
allon
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7) From: Allon Stern
On Sep 28, 2010, at 1:15 PM, Tom & Maria - Sweet Maria's Coffee wrote:
<Snip>
Actually, I think there is a major deficiency in the roast chamber design.
The #1 problem is that the heat output is measured *before* the chamber. If the iRoast had a probe that stuck up out of the middle of the base, which impaled the roast chamber when seated, it could measure the temperature of the bean mass, not the air temp going into the bean mass. That one design flaw, I think, lead to a "profile roaster" that gave you no real profile control at all. You could profile the heat going out, but not the bean temp.
And even that is being generous, considering how inaccurate the temp readings are on the stock iRoast.
-
allon
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8) From: Michael Mccandless
Agreed - just received the 2nd 20# order,
McSparky
On Tue, Sep 28, 2010 at 7:31 AM, miKe mcKoffee  wrote:
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