Aplikasi Pemantau Suhu dan Kelembaban Udara Berbasis Nuvoton NUC140VE3CN dan Sensor HTU21D

Abstract

The parameter of temperature and relative humidity have an important role in the growth and development of horticultural crops. Based on this, monitoring application is designed to use personal computer (PC) as a data viewer of the measurement results. Hence, it allows users to observe these parameters with ease. In this study, Nuvoton NUC140VE3CN performs data processing of temperature and relative humidity from HTU21D sensor, after which the data will be displayed on 128x64 Black Dot Matrix LCD and they are also sent to the PC through serial communication (via FTDI232RL module). These data will be received by user's PC serial port, and be displayed by the Processing application that has been created. From the performed tests, the application had been able to display temperature, relative humidity, time, the status of temperature and relative humidity appropriately as planned. The application is capable to record data and save them in a CSV-formatted file. The status of temperature and relative humidity had been able to indicate optimal or non-optimal condition. The test for measurement accuracy was performed by comparing the readings from HTU21D sensor to referenced analog Thermo-hygrometer. The average temperature obtained from HTU21D sensor is 25.1ºC, while Thermo-hygrometer results in 25º C. The measurement differences between them are 0.5ºC with average error of 2%. For average relative humidity, the result obtained from HTU21D sensor is 72.1% and it is 65.4% from Thermo-hygrometer . The differences between them are 6.8 % with average error of 10%.