Development of microcontroller-based temperature and humidity data logger

Abstract

In this paper, the developed hardware and software of a microcontroller-based temperature and humidity data logger has been described. The device measures temperature and humidity, displays the temperature and humidity values on an LCD screen, and writes them to a microSD memory card. The microcontroller-based temperature and humidity data logger has a menu that allows users to set up its operation mode. The microcontroller-based temperature and humidity data logger consists of an Arduino Uno R3 board on an ATmega328P-PU microcontroller, an HTU21D digital temperature and humidity sensor, a RobotDyn shield with RTC IC DS1307, and an HD44780 alphanumeric LCD micro SD memory card reader. The electrical circuit of the microcontroller data logger was designed in the Proteus CAD system. An operation algorithm of the microcontroller temperature and humidity data logger was developed. The software modules for communicating with the HTU21D digital temperature and humidity sensor and outputting information to the alphanumeric LCD module (based on the HD44780 controller) have been created, along with the main data-processing software. The model of the microcontroller- based temperature and humidity data logger in Proteus ISIS was created and simulated. A prototype of the microcontroller-based temperature and humidity data logger was also created and tested.