Research And Design Of Greenhouse Environment Monitoring System Based On Internet Of Things

Aiming at the problems of high construction cost,high power consumption,limited transmission distance,and low communication reliability of the existing greenhouse environment monitoring system,ZigBee technology and Narrow Band Internet of Things(NB-IoT)technology are used as wireless communication methods.Combining sensor technology,embedded technology,computer technology and other technical means,a set of greenhouse environment monitoring system based on Internet of Things is designed.The system can monitor the five environmental parameters of air temperature,air humidity,intensity of illumination,CO₂ concentration and soil moisture in the greenhouse online,and can remotely control execution equipment such as roller shutters and negative-pressure fans.It has strong stability and high degree of networking,low power consumption and low cost.The main research contents are as follows:1.Develop the overall design plan of the system.The structural characteristics of the commonly used solar greenhouses in northern areas and the environmental factors affecting crop growth were analyzed,and the functional requirements and design goals of the monitoring system were clarified.After in-depth research on the technical characteristics of ZigBee and NB-IoT,an overall system design plan including three parts of the greenhouse field node,the Internet of Things platform and the monitoring management platform was proposed.2.Complete the hardware design of the system according to the specific requirements of the greenhouse environment monitoring system.First divide the greenhouse site nodes into environmental monitoring nodes,equipment control nodes and convergence gateway nodes;secondly,select the hardware modules that constitute each node,and expand the circuit schematics and PCB principles according to the selected hardware modules.Figure design;finally welding and debugging the circuit board to make the actual node hardware.3.According to the choice of system hardware,further complete the node software design.Research on the Z-Stack-based CC2530 networking process and NB-IoT module drive process,using IAR and Keil5 development environments to design ZigBee software and STM32 software,and realize ZigBee network formation,environmental data collection,and NB-IoT network communication and perform equipment control and other functions.4.Study the process of NB-IoT device access to Huawei Ocean Connect platform,developed profile file and codec plug-in,realized the codec operation of uplink/downlink data;completed the registration of NB-IoT device,bound to the platform,and finally Device and platform docking.5.Designed and implemented a remote monitoring management platform.First,an application server was built and My SQL software was used to design the database and its relational tables;secondly,based on the Model-View-Controller(MVC)design framework,using Java language and Java Script,j Query Easy UI and other front-end technologies to build Web application for online monitoring of data and remote control of equipment.Finally,in order to verify the feasibility of the scheme and the stability of the system,the system was deployed and installed in the solar greenhouse of the cooperating unit for testing.The test results show that the system has good wireless communication quality,accurate monitoring data,stable equipment control,simple operation and easy maintenance,and has certain practical value.It can improve the scientific management level of greenhouses and is of great significance to the development of agricultural modernization.