Paddy Rice Moisture Tester with Bluetooth Data Transfer

The weight of water contained in paddy rice which is expressed in percent is called Moisture Content. Moisture Content measurement is important to achieve the levels for safe and long-term storage. Accurate measurement also an influence on the market price because of weight loss if the grain is sold too dry. There exists moisture tester in the market but lacks convenient functionalities such as data storage and data transfer. This opens an opportunity to create a design solution for a moisture tester with upgraded functionalities. The design solution was created by constructing a moisture tester driven by ATmega328P microcontroller where a moisture sensor, DHT-22, was connected. The DHT-22 is responsible for sensing the moisture content of the paddy rice with a measurement unit of EMC or Equilibrium Moisture Content. These data then are saved in a micro SD card. It also has a real-time saving in which the moisture content readings are transferred to a computer using an HC-05 Bluetooth module and saved into a database. The system functionality test demonstrates that the constructed design has satisfied the objectives. In conclusion, the researchers were able to measure the moisture content with minimal discrepancies, save the moisture content of the paddy and communicate with computers connected to it.