Alat Pengering Biji Kopi dengan Memanfaatkan Sensor Soil Moisture Berbasis Mikrokontroler

Abstract

Coffee bean drying is one of the important stages in the coffee processing process, which affects the quality and taste of the coffee beans. However, traditional methods that rely on sunlight have limitations, especially in unpredictable weather. This study aims to design and realize an automatic coffee bean dryer using soil moisture and DHT11 sensors. The soil moisture sensor is used to monitor the water content of coffee beans, while the DHT11 sensor measures and maintains the temperature in the drying chamber at an optimal limit of 55°C. The test results show that this tool is able to reduce the water content of coffee beans from 59% to 12% in 320 minutes with a capacity of 500 grams of coffee beans. The automatic system works well, where the heating element will activate when the temperature is at the set point of 55°C, and the fan will turn on to cool the temperature when it reaches that limit. The drying process is efficient without reducing the quality of the coffee beans, with an average temperature difference stable at 54°C - 55°C. This dryer provides an effective and efficient solution to overcome the limitations of traditional methods. With the advantages of automation and real-time monitoring, this tool can help farmers and coffee entrepreneurs in producing high-quality coffee beans consistently, without relying on weather conditions.