Design Of Temperature And Humidity Monitoring System Based On Si4432 Wireless Sensor Network

With the development of sensing technology and communication technology,wireless sensor network research has become a hot area.Combining multiple sensors to achieve high stability,low cost,multi-parameter data acquisition and wireless monitoring is an important issue for wireless sensor networks,and has wide application in the national economy.This research combined with embedded technology,implemented a temperature and humidity wireless sensor network system based on Si4432 emission chip module.The main research work of this paper is as follows:First,the hardware circuit design of the temperature and humidity monitoring system was completed.The PIC24FJ64 microprocessor and the Si4432 RF transceiver chip are mainly used to design a low-power temperature and humidity wireless sensor network system.It includes the wireless networking module,the temperature and humidity collector circuit and the concentrator circuit based on the wireless networking module.Second,The software design of the temperature and humidity monitoring system was completed,and the point-to-point wireless data receiving and sending process in the sensor network was realized.In the wireless communication,a networking routing protocol and a data collision avoidance algorithm are specified to ensure that information is effectively delivered.Third,the display interface design is completed.The first part introduces the upper computer software design.The host computer display interface was written by QT Creator software,and the Sqlite database storage function was added to the program.This facilitates the monitoring personnel to view the collected temperature and humidity values.The second part introduces the mobile phone software design.A mobile phone APP interface was written by Android Studio software.The upper computer and the mobile phone terminal set up a local area network through a wireless router,and display the temperature and humidity values onthe mobile phone APP terminal through Socket communication,thereby realizing the remote monitoring of the collected data.Through testing the monitoring system,the test results show that the communication distance between the nodes can reach 1000 meters in the clear view of obstacles,and the transmit power of the RF chip can reach 20 d Bm at most,and the system has low power consumption and can support battery power supply.The system is low in cost and practical,and can be widely used in fields such as smart agriculture,smart home and security monitoring.