The Design Of LoRa Wireless Sensor Network In Ground Deformation Monitoring

With the rapid development of internet of things technology,people rely more and more on this technology to solve practical problems in life,such as data monitoring and intelligent control.In recent years,frequent landslides,mudslides and other natural disasters have occurred in various parts of China,resulting in a large amount of property damage and casualties every year.Wireless Sensor Network(WireLess Sensor Network,WSN)technology has also become the main way to solve this type of problem.Most of these disasters occur in areas with relatively remote geographical locations and inaccessible traffic.Taking into account the above objective factors,it is urgent to develop a monitoring and early warning device with reliable quality and stable performance,which can be used for long-term real-time monitoring in a harsh environment to ensure people's lives and property.In China,the monitoring and early warning research on such disasters is late,and some data such as slopes are mostly tested manually.This method has low real-time performance.In addition,for example,the transmission distance is not ideal,and the monitoring accuracy is not high,difficult to install.Thanks to the continuous advancement of wireless sensing technology,the problems raised above can be better solved.The collection and analysis of data information is first collected by sensors.There are two options for the data transmission medium: 1)through the wired connection,common RS232,485,SPI,I2 C and so on.This method is limited by the transmission distance.2)Communication using wireless transmission,such as Bluetooth,WiFi,ZigBee,LoRa.Considering the monitoring equipment's requirements for transmission distance,power consumption,number of node connections,and the rapidly growing LoRa communication technology in recent years.At the same time,combined with Micro Electromechanical System(MEMS)sensor,by referring to the existing research data,this thesis needs to design a wireless sensor network with LoRa communication technology as the carrier to realize the monitoring and warning System with long transmission distance,simple networking,high sensitivity and long working time.The surface deformation monitoring system is composed of data acquisition node,sink node and monitoring center.The acquisition nodes deployed in different locations form a star network structure with the sink nodes through LoRa wireless communication.The acquisition end acquires the ground tilt attitude information through the MEMS tilt sensor and processes it to the sink node by using the STM32 microcontroller.The sink node transmits the information to the monitoring center remotely through GPRS communication.The monitoring center is developed in C# language to achieve the purpose of visual monitoring and warning of data.Power supply becomes difficult due to factors in the application environment.Therefore,a solar power supply scheme will be used in the design to ensure that the equipment can continue to work stably.