Implementation and Study of a Greenhouse Environment Surveillance System Based on Wireless Sensor Network

Wireless sensor network is a kind of self-organization wireless network which taking the data as center. The node in network is intensive, huge quantity and covering a large area. Aiming at the characters of wide range of area, large amount of information, and complexity of real-time transmission in rural district, this paper developed a wireless sensor network system based on ZigBee technology for greenhouse which consists of sensor nodes, the cluster, clustering nodes and task management nodes. Since in this system energy efficiency is one of the most decisive factors of designing node, a new protocol of managing slots was used, which adopted slots scheduling algorithm to resolve beacon conflict. Moreover, a method of using minimum contention window (CWmin) was presented in the paper in order to reduce probability of collision, by which the performance of wireless sensor network was improving. According to the fact of rural district and characteristic of wireless sensor, a feasible wireless sensor network system used in farmland area was designed, which solved the practical application problems of network structure, such as node localization, route search and energy supervision.