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allenb

12/07/2023 4:10 PM

Lostx403

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12/07/2023 9:47 AM

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12/06/2023 1:11 AM

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12/05/2023 2:44 AM

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Homeroasters - Home Roasting Coffee Community » BUILDING A ROASTER » Building a Coffee Roaster

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Apwollo 11 roaster build
krampe	#26 Posted on 11/17/2023 10:26 AM
Newbie Posts: 24 Joined: February 08, 2023	Worked on the burner because it was interfering with the bean temp measurements. Details are found here: https://homeroast...post_77647 The limit of the roaster is at 1.2kg (16 min roast). However for roasting in colder temperatures in the winter now I am going with 2 800g(9-10min, probably 12 when below freezing) batch sizes which last for 7-8 days. The fan died on me, which was partially my fault because I set a wrong parameter in the phidgets that causes the motor to be used as break when stopped. Disabled that and then next 8$ fan is going at it. Also the temperature probe got replaced by an RTD (PT100). Playing around with PID control now. I wrote a simulator for artisan that let's me put in max ROR for burner, max ROR for air (negative PID control), turning point temp/time range, and temperature delay + temperature error range. This really helps designing curves and testing the PID parameters. I am glad I have that simulator, because without it I would have wasted a bunch of beans. Still fine tuning is necessary on the real roster but I got it quite close and the resulting coffee is drinkable. My biggest problem was that the RTD is 20F lower than the thermocouple before and I didn't adjust the PID curve for it. Edited by renatoa on 11/17/2023 10:58 AM


Piotrkurak	#27 Posted on 11/18/2023 9:48 AM
1/4 Pounder Posts: 65 Joined: March 01, 2023	Pid adjusting is difficult. Why not adjust the temprature up 20 degrees?


krampe	#28 Posted on 11/18/2023 10:15 AM
Newbie Posts: 24 Joined: February 08, 2023	yeah I already adjusted down by 20F. just trying to mitigate the oscillation at this point.

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