Research On Water Environment Monitoring System Based On River Wireless Sensor Network

River is an important source of water for live,agriculture and industrial production.And monitoring is the main method to master,evaluate and predict the quality of river water environment and to forecast river pollution.The development of sensor technology and communication technology has formed a wireless sensor network,which can be widely used in the field of environmental monitoring.River water environment monitoring adopts wireless sensor network technology,which overcomes the shortcomings of traditional detection methods,and can realize real-time,low-cost,long-term and long-distance monitoring tasks.In order to solve the problems of long river monitoring distance and poor network stability,a grouped wireless sensor network water environment monitoring system is designed by using modern sensors,wireless communication technology and computer software technology in this subject,which is suitable for river monitoring.Firstly,according to the distribution of the river,the network topology of the river is extracted,and a method of using a packet wireless sensor network is proposed.Then,the river is reasonably divided into a number of Zig Bee network groups with a suitable length of "linear" structure,and each section constitutes a water environment monitoring point.Finally,each Zig Bee network uses a data transmission unit to remotely transmit the water temperature,dissolved oxygen,p H and conductivity monitored by each sensor node to the data center through the mobile network.The hardware of the system includes a high-precision analog front-end for water quality detection,a solar power source with battery backup,a highly expandable controller unit,and Zig Bee and DTU communication modules.And waterproof aluminum alloy junction boxes and aviation joints are used to improve the protection and adapt to the field environment.In addition,the program flow chart of convergence point and sensor node is given,and the corresponding embedded program is designed.The Zig Bee module,the configuration method of DTU and the application of the host computer demonstration system are introduced.Finally,the calibration of each sensor and wireless communication of nodes are tested,and the system joint debugging is completed.The result shows that the system can complete the tasks of detection and transmission,and display the detection results of sensor nodes on the web monitoring interface.The measured data is accurate,the operation is stable,and the performance meets the design goals.