Design and development of air temperature and relative humidity monitoring system with AVR processor based web server

In this paper improved design of previously developed system for temperature and relative humidity measurement and data acquisition is described. Hardware of the system is extended with Arduino Uno and Ethernet Shield boards. SHT11 sensor is used for obtaining information about air temperature and relative humidity. Storing the results is on the micro SD card in CSV file. Main software improvement is adding of embedded Web server which enables immediate access to sensor readings through Internet. The designed system is tested under different conditions and in all tests the system worked stable and accurately.