Microcontroller-Driven Temperature Control for Superior Coffee Roasting

This research developed an automatic coffee bean roasting machine using stainless steel 304 and an Arduino Mega 2560 microcontroller. The machine's frame, made of stainless steel 304, features a door for easy access. A repurposed grill heating element serves as the roaster. Inside, a stainless-steel wire mesh cylinder holds the beans and rotates via a step motor connected to an axis. A tray at the bottom collects the coffee bean flakes. The study experimented with three roast levels: light, medium, and dark. For a light roast, the beans were roasted at 200-250 °C for 375 seconds. The medium roast was done at the same temperature range but for 400 seconds. The dark roast required a temperature of 200-265 °C for 440 seconds. The Arduino Mega 2560 was programmed to automate the heating and motor control. The results showed consistent coffee beans with good taste and a strong coffee aroma.