Design And Development Of Agricultural Monitoring System Based On IoT Gateway

Agricultural data is an important information resource in the agricultural production process.Common types of agricultural data include air temperature and humidity,CO2 concentration,light intensity,soil nutrients,etc.By collecting and analyzing agricultural data,it can help agricultural producers to make better decisions and thus improve production efficiency.In this thesis,we aim at optimizing some agricultural data monitoring systems in terms of cost,flexibility and scalability,develop agricultural monitoring IoT gateway nodes and data access nodes,design key interaction interfaces such as access data messages and protocol conversion,build scalable and expandable agricultural monitoring systems,and realize low-cost and high-efficiency monitoring of agricultural data.The main research work of this thesis is summarized as follows:(1)The overall architecture of scalable agricultural monitoring system is proposed.Using the idea of function splitting,the IoT gateway is designed to be separated in physical implementation,disassembling the upstream and downstream access capabilities to form gateway nodes and data access nodes.The software is designed to split the data collection,storage and visualization capabilities of gateway nodes to form data collectors,controllers and publishers.The overall architecture of the scalable agricultural monitoring system is designed by planning the combined hardware and software operation of gateway nodes and data access nodes,including single-gateway mode agricultural monitoring system and multi-gateway cooperative mode agricultural monitoring system.(2)Gateway node development.Allwinner H3 chip is used as the main control,with external memory,audio circuit and various interfaces,which makes the gateway nodes have good scalability.The software is based on embedded Linux operating system,designing key interactive interfaces and gateway Scada software,realizing the collection,storage and release of agricultural data,laying the foundation for the low-cost and high-efficiency construction of agricultural monitoring system.(3)Data access node development.The data access node is used as a terminal node for agricultural sensor data acquisition and equipment control.Using STM32F1 series chip as the main control,a variety of sensor communication interfaces and control circuits are designed to meet the diverse agricultural sensor data access needs.(4)Module function testing and system application.The main functions and performance of the gateway nodes and access nodes were tested in modules,on which two agricultural monitoring systems of different scales were built respectively.The agricultural monitoring system built by a single gateway was deployed and tested in an agricultural shed laboratory on campus.The test results show that it can meet the needs of small-scale agricultural data monitoring.The agricultural monitoring system built by multiple gateways was tested to verify the feasibility of large-scale agricultural data monitoring scenarios.(5)Agricultural monitoring system software visualization platform development.In the single-gateway agricultural monitoring system,the AIot Client desktop interface and cell phone browser interface are designed and developed to provide access control functions for users.In the multi-gateway mode agricultural monitoring system,based on Web technology,the visualization platform of agricultural monitoring is designed and developed with the idea of front and back-end separation to realize the real-time monitoring and historical data analysis functions of agricultural data.An IoT gateway-based agricultural monitoring system designed in this thesis is less costly and more scalable,which helps agricultural producers to improve their production efficiency.