Research On Measurement And Control System Based On Wireless Sensor Network

Wireless sensor network ( WSN ) is a new kind network technology for communication,in recent years. It achieves the integration of many technologies,for example,sensor technology,computer technology,communication technology. It can monitor,collect,transfer and process the real-time information of the object and environment in the area covered by the network. Wireless sensor network has the characteristics of low cost,low power,and is easy to implement. So it can be applied in many areas such as military,environment,health field and automation.Measure control system based on wireless sensor network that is applicable to environmental monitoring is designed. The network platform for environmental monitoring is built up with ZigBee compatible module JN5121-Z01-M00 as its core device,and temperature and humidity sensor SHT11 and light sensor TSL2561 as its main external interface device. The software includes coordinator and end device programs are designed based on the ZigBee protocol and Jennic ZigBee protocol. The softwares are mainly used to start network,collect data and transceive data. For the particularity of low-energy and large-data of the wireless sensor network,low-power and non-blocking method for designing program is used.For the particularity of measure control system based on wireless sensor network, the least nodes are used under the guarantee of full connection. A model that uses least nodes and ensures full connection is proposed and genetic algorithm is used to optimize. The genetic algorithm with large measure nodes based on dichotomy to improve convergence rate is put forward, which can ensure the accuracy and significantly reduce the length of Chromosome and improve the optimizing rate. For the problem of time-consuming for judging the connectivity,Dijkstra's algorithm is applied in connection judgment , which can obviously accelerated rapidity of optimization.For the features of measure control system based on wireless sensor network with large nodes, more information, and the number of network nodes and types can be dynamically adjusted according to the needs of users, PC program is designed,including databases and OPC interface programming. Database is used to store the node type. And the user can increase or reduce nodes at any time. Tag is automatically generated according to the database. Each Quantity of nodes corresponds to a tag and data can be directly stored in accordance with this tag and displayed real-time.