Construction of a portable cost effective temperature and humidity measuring device

Temperature and humidity are the most significant weather parameters in human development. The monitoring of temperature and humidity manually has been characterized with inaccurate measurements due to human errors. This project describes the construction of a portable cost effective device for measuring temperature and humidity; it is based on wireless technology. The measuring device obtains temperature and humidity data by using DHT22 sensor. The hardware used for the project includes Arduino Uno, Liquid Crystal Display (LCD) and DHT22 sensor; the software employed is the Arduino IDE. C programming language was used and the libraries of each component were installed in the Arduino IDE. A program code in the Arduino IDE (sketchbook) was created to enable the DHT22 sensor, LCD and Arduino work. The DHT22 was initialized at 5 V. The readings were gathered serially and transferred to a computer which communicates with the Arduino and displays the values on the LCD for human interface. The device was tested at different locations and different times for two consecutive days. The results show that the cost effective, portable device is able to detect and record temperature and humidity effectively.