# Coffee Roasting # Skywalker Roaster Info Arduino for connecting to Artisan [https://github.com/jmoore52/SkywalkerRoaster/blob/main/README.md](https://github.com/jmoore52/SkywalkerRoaster/blob/main/README.md) Youtube Tutorial for Artisan mod [https://www.youtube.com/watch?v=7sCwAg7CAzw](https://www.youtube.com/watch?v=7sCwAg7CAzw) Roaster Wiki [https://skywiki.coffee](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:** 1. Warm up at 202°C for 1 min. 2. Set to 185 °C, let it reduce until 183–185 °C, hold for 1 min. Check if the air temperature is steady too. 3. Insert beans and adjust power to 60 4. 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) 5. From 2:00 to 2:30, reduce power by 5 6. 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”). 7. 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 8. 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). 9. 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. 10. For medium and dark roast, final fan speed = \[medium: 55, dark:60\] + drum speed (70–80). 11. 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_dev19.2_24-10-31_2158.alog.png](https://chriz.me/uploads/images/gallery/2024-10/scaled-1680-/CQxIoNShplUGChQ1-medium-dev19-2-24-10-31-2158-alog.png)](https://chriz.me/uploads/images/gallery/2024-10/CQxIoNShplUGChQ1-medium-dev19-2-24-10-31-2158-alog.png) Medium Roast Dev 19.2% 320g Guatemala Antigua Los Volcanes EAP HK 200 CUP 120 # 29 Nov 2024 Honduras Abeja Honey - Medium Roast [![Honduras_honey.png](https://chriz.me/uploads/images/gallery/2024-11/scaled-1680-/oW7coF6tVp5W4r5v-honduras-honey.png)](https://chriz.me/uploads/images/gallery/2024-11/oW7coF6tVp5W4r5v-honduras-honey.png) Bean information https://drwakefield.com/coffees/honduras-abeja-honey/