Research On Water Quality Detection Based On Wireless Sensor Network

Traditional municipal sewage detection is carried out offline and manual operation,so there is obvious lag effect,which wastes a lot of manpower and financial resources and reduces production efficiency.With the rapid development of sensor technology and wireless communication technology,this thesis deeply analyzed the water quality detection indicators,combined with sensor technology and wireless communication technology,studied and designed a water quality detection system based on wireless sensor network.The main contents of this thesis are as follows:1.An on-line water quality detection system consisting of measuring nodes,coordinator and PC host is designed,and the hardware design of the system is completed.Among them,MSP430 MCU and sensor are used to collect multi-point water quality parameters,STM32 MCU is used as coordinator,and NRF24L01 wireless communication module is used to construct wireless communication network,which realizes data transmission between measurement node and coordinator.The coordinator communicates with PC through RS232 serial port.2.The software program of water quality detection system is designed with C language,including water quality data acquisition and processing,wireless transmission and reception,data display,abnormal alarm and serial transmission.3.In the environment of QT5.8,the monitoring interface of host computer is developed by C++ language,which realizes the functions of remote real-time display,analysis and storage of water quality parameters.The water quality detection system based on wireless sensor network designed according to the above contents has been tested in the laboratory.The results show that the wireless sensor network node network is fast and stable,the communication distance can reach 150 meters,the average packet loss rate of nodes is no more than 3%,the average temperature accuracy error is no more than 0.10 C,and the PH value is precise.The average degree error does not exceed 0.05.The system runs stably and reliably,has low cost,friendly interface,good expansion,and has good application prospects.