Design of a Water Content Testing Device For Coffee Beans (Coffea sp) Based on Arduino Uno Microcontroller

Abstract

Drying removes or eliminates water content from a substance by evaporating water from the material using thermal energy. Drying is a preservation method that involves reducing the moisture content of a substance, allowing it to be stored for an extended period. This research aims to design a moisture content testing device for coffee beans based on a microcontroller. The research method employed in this study is experimental, conducted in the Solar Dryer Dome of Karang Sidemen Village. The study involves several stages, including tool and material preparation, designing the moisture measurement system, programming, microcontroller assembly, and testing the designed moisture measurement device using coffee bean samples. The coffee bean test data are then utilized to determine the moisture content of each sample using the oven method. The moisture content data from five trials are used as references for calibrating the device against the actual moisture content in coffee. The regression value from y = 322.44e-0.007x is then applied to convert the sensor output values into actual moisture content values of coffee beans. The design of the moisture content testing device for coffee beans (Coffea sp) has been successfully created using Arduino UNO as the microcontroller. This device is designed to acquire analog data from the SEN0308 moisture sensor, converting it into the final output of moisture content.