Coffee is one of the most common and favorite beverages that many people have been consuming around the world. A smart coffee roaster uses a smart sensor and controller to operate the roaster and to get the best consistency and also accuracy of the resulting roasted coffee. The current paper discusses the electricity, design, and Artificial Intelligence (AI) needed to make the best version of a smart coffee roaster. The electronic system consists of a sensor, controller, and actuator. Sound and temperature sensors are the ones that are used within the device; meanwhile, the most commonly used controller is a microcontroller. Actuators are the driving motors of the roaster drum. Ergonomic, aesthetic, and user comfort are the primary keys needed to make a good design. The AI application detects the ripeness of the coffee seeds and the “crack” sound detection. Based on the comparison of previous studies that have been done before, readers are expected to identify the required needs of specifications within a smart coffee roaster.