Wi-sensors: A low power Wi-Fi solution for temperature and humidity measurement

This paper presents a complete solution for temperature and humidity monitoring using low-power wireless devices, called Wi-Sensors. The Wi-Sensors use a RN-131C Wi-Fi chip as the core microcontroller and 4 configurable digital input/output lines to which temperature sensors can be attached. The digital 1-Wire and DHT22 protocols had been implemented in the embedded application running on the device. Therefore, for temperature and humidity measurements, any of the sensors operating with one of these two protocols can be used. The existing Wi-Fi 802.11 infrastructure can be used in order to send measurement data to remote destinations. The proposed solution also incorporates a data viewer and data processing application, which provides functionalities for alarming the users by email or by SMS in case previously configured limits are exceeded.