Coffee Roasting
My coffee roasting notes

Skywalker Roaster Info
Arduino for connecting to Artisan
https://github.com/jmoore52/SkywalkerRoaster/blob/main/README.md
Youtube Tutorial for Artisan mod
https://www.youtube.com/watch?v=7sCwAg7CAzw
Roaster Wiki
https://skywiki.coffee

General Roasting Guide
 
 
Light
Medium
Medium dark
Development rate
10–18%
17–22%
>25%
Time
FC to FC+40s
End of FC to +1:30s
SC
Temp + FC (125 g)
4–8 °C
9–12 °C
+20 °C
Temp + FC (150 g+)
5–9 °C
11–14 °C
+20 °C
 
Default setting:
Start temp
183 °C
Power
60
Fan
30
Drum speed
70
Rule of thumb (normally):
Turning point should be around 25–40 s.
Begin – yellowing (“stage A”): 4:30–5:00
Yellowing – FC (“stage B”): stage A + 3:00
FC – finish (“stage C”): check table above
 
Procedures:
Warm up at 202°C for 1 min.
Set to 185 °C, let it reduce until 183–185 °C, hold for 1 min. Check if the air temperature is steady too.
Insert beans and adjust power to 60
When ROR = positive, adjust power to 90 to 100 (light roast = 100, medium roast = 95, dark roast = 90) OR the earlier the turning point, the lower the power is (e.g., 25s = turning point, power = 90)
From 2:00 to 2:30, reduce power by 5
When ROR begins to decrease, increase fan speed by 10 to make sure ROR steadily decrease (NOTE: increase fan speed may also increase ROR, keep an eye on ROR trend, reduce power by 5 if needed). Do this before yellowing (“stage A”).
After yellowing (“Stage B”) + 20s, reduce power (by a step of 5) for steadily decrease in ROR (e.g., from 90 to 60 gradually). Reduce only if there is an upward trend >10 s. DON’T LET ROR TO CRASH
Before FC (FC minus 10°C, typically ranged from 185–195°C):
Reduce power by 5 or 10, if there is any sign of ROR increase (=exothermic stage). However, don’t let power goes below 60.
Increase fan speed twice by 5 (total = 10).
When FC is in progress:
reduce power (reduce by 5). For washed bean: During FC, ROR may drop drastically. To fix this, increase power and rotation to 70+. 
If it still increases, drum speed = 70+.
If it still increases, fan = 50+.
Then, reduce power stepwise by 5 until it’s finished.
For medium and dark roast, final fan speed = [medium: 55, dark:60] + drum speed (70–80).
Check table above for ideal roasting levels.

Roasting Record
Roasting Record and notes
You may find the roasting date to reference to the note.

31 Oct 2024 Guatemala Medium Roast
Medium Roast Dev 19.2% 320g
Guatemala Antigua Los Volcanes
 
EAP HK 200 CUP 120

29 Nov 2024 Honduras Abeja Honey - Medium Roast
Bean information
https://drwakefield.com/coffees/honduras-abeja-honey/