Design And Experiment Of Field Data Acquisition System Based On LoRa Communication

With the continuous development of information technology and the country’s continuous investment in agriculture,more and more new technologies and applications are gradually being put into agricultural production,helping to increase agricultural production and efficiency.Efficient and convenient data collection and remote monitoring can reduce labor input in agricultural production and help improve agricultural production efficiency.Doing a good job of agricultural data collection is the basis for the development of modern information technologies such as the agricultural Internet of Things and agricultural big data.This thesis focuses on the field data collection requirements,compares the differences of several different wireless communication methods,and finally designs a field data collection system based on Lo Ra communication technology.The main content of the thesis includes the hardware circuit design of terminal nodes and gateways,microprocessor program design,server program design,system testing and the development of peanut field monitoring experiments.In the design of the underlying hardware of the system,the structural block diagram of the terminal nodes and the gateway and the specific hardware circuit design are emphasized.The terminal node is designed based on the STM32F103ZET6 microcontroller,and also introduces the principles of the soil moisture sensor,temperature and humidity sensor,and related circuit connections;the gateway part mainly introduces the characteristics and circuit connections of the data storage module and remote transmission module,and 12 V Turn 5V circuit and relay drive circuit.In the system software program part,the programming of the terminal node,the programming of the gateway,and the interaction process between the terminal node and the gateway are introduced.Finally,the system and server related parts are introduced: the server program flow,database design and database management tool Navicat.Through the introduction of this part,you can know the program operation flow of the terminal node and gateway and the interaction process between them,and understand how the data of various sensors are uploaded from the bottom to the cloud server.The performance of the system hardware was tested: power consumption test,communication distance test.Through the power consumption test,we have mastered the standby time of the terminal node and the gateway;In the actual field deployment environment,when the distance between the terminal node and the gateway is 800 m,the communication success rate can reach at least 94%.As the distance increases,the communication success rate basically decreases.Finally,more than 20 days of peanut field monitoring experiments were conducted to further verify the performance of the system in outdoor work.The research in this paper has certain application value,and can provide some references for other data collection,remote monitoring and other applications.