Design And Implementation Of Farmland Information Collection And Monitoring System Based On LoRa

Agriculture,as the basic industry in China,has a long history of development,but the traditional agricultural production model will not only waste a lot of human and material resources,but also limit the further improvement of farmland yield.In the critical period of China’s economic structure transformation,agricultural production must abandon the traditional mode of production and achieve precision,informatization and modernization of agricultural production.Under this background,this paper proposes a set of farmland information acquisition and monitoring system based on Lora wireless communication technology.The main research work and results of the system are as follows:(1)Design of the overall scheme of the system.From the terminal acquisition node for obtaining farmland information to the gateway node with the functions of information collection and protocol conversion,and then to the upper computer management system that can be used for human-computer interaction,information display,storage and analysis,a complete solution of farmland information acquisition and monitoring system is given.(2)Design and implementation of data encryption transmission scheme.This paper analyzes the risk of the way of data plaintext transmission between the acquisition node and the gateway node,and puts forward a more secure data encryption transmission scheme.The scheme integrates the advantages of AES and RSA encryption algorithms to ensure the safe transmission of data without reducing the speed of data transmission.Finally,the operation of the encryption scheme on STM32 single chip microcomputer is realized by transplanting mbedtls standard library.(3)Design and implementation of directional transmission networking scheme based on polling.Aiming at various communication problems in LoRa ad hoc network mode,a directional transmission networking scheme based on polling is proposed.The scheme solves the problem of channel contention in one to many communication in ad hoc network mode,not only ensures the orderly communication of LoRa nodes,but also reduces the power consumption of nodes,and completes the location of fault nodes.(4)Design and development of upper computer management system.According to the idea of three-tier architecture,the framework of upper computer management system is designed,the UI design and corresponding function development of system login,environmental parameter display,irrigation parameter setting,user management and other modules are completed,and the data storage is completed through MySQL database.Finally,aiming at the authority problem of the upper computer system when facing different users,the system manages the user’s identity to ensure that the system can be used by personnel with different identities.Finally,the system is built and tested.The test results show that the packet reception rate of all nodes is higher than 98%,and the garbled code rate of all nodes for data analysis is 0%,which ensures the stable transmission of system data.It shows that the system can well complete the functions of farmland information collection,transmission and display,and has a good application prospect in small wireless ad hoc networks.