DEVELOPMENT OF AN INTERNET OF THINGS-BASED SYSTEM FOR CONTROLLING TEMPERATURE AND HUMIDITY IN THE COFFEE BEAN STORAGE FACILITY

Abstract

The objectives of this research were to design and develop a temperature and humidity control system for the coffee bean storage facility using the Internet of Things, and to evaluate the efficiency of the Internet of Things-based system for controlling temperature and humidity in the coffee bean storage facility. The hardware components used in designing and developing the system included: 1) NodeMCU ESP8266 board as the controller, 2) DHT22 temperature and humidity sensors, 3) a 1602 LCD display, 4) relays, and 5) ventilation fans. The software consisted of 1) The Arduino IDE application for creating software to control board operations, 2) C/C++ for programming on-board operations, 3) MySQL for generating and storing temperature and humidity data, 4) Apache Web Server for establishing a web server to receive data from
the controller board, and 5) the Blynk Application for creating smartphone user interfaces.
The subsequent step involved connecting all the equipment and programming to create a temperature and humidity control system within the coffee bean storage facility. The system activates the ventilation fan when the internal temperature exceeds 30 degrees Celsius
or humidity levels exceed 68 percent, and subsequently turns off the fan when these parameters return to normal. Furthermore, the system can log temperature and humidity data into a database and notify users when either the temperature or humidity exceeds predetermined thresholds via the LINE application. Users have the option to specify whether the system should function automatically or be manually controlled, using the Blynk application. The system's performance was assessed by purposively sampling 5 experts in system design and development using questionnaires. The evaluation results indicated excellent overall performance, with a mean score of 4.37 and a standard deviation of 0.57.