An HTTP-based environmental monitoring system using power harvesting

This paper presents the development of an energy efficient environmental sensor that sends measurement data to a cloud platform using HTTP (Hypertext Transfer Protocol) requests. The device is based on a programmable system-on-chip (PSoC), and is equipped with a temperature and relative humidity sensor for taking measurements and with a WLAN (wireless local area network) module for sending data to the server. The main characteristics of the device consist in low power consumption, robustness and small dimensions. The developed sensor node supports the addition of power harvesting elements and this possibility was evaluated. Testing showed that energy autonomous wireless sensors using HTTP-based services represent a feasible solution for environmental monitoring applications in the context of Internet-of-Things (IoT).