Design of distributed city noise monitoring system based on wireless sensor network

A multi-nodes-distributed noise monitoring system based on wireless sensor network (WSN) is proposed to solve the noise monitoring problem in the city. Compared it with the conventional noise data acquisition system, the multi-nodes-distributed noise moniforing system solves not only the problem of difficult data acquisition, but complex wiring and sophisticated maintenance. The city environment rich supply lines matching with solar batteries meet the energy requirement of wireless nodes' sustained working. The nesC language is used to design the WSN communication in TinyOS environment. LabVIEW is applied to achieve communication between WSN gateway and host PC and moreover, human-computer interaction panel is completed. With a link to the city map database, 3-D distributed city noise contours can be dynamically displayed in real-time. This system was tested under laboratory environment; the experimental results are correct and show this system was reasonable.