Development Of Greenhouse Environment Monitoring System Based On NB-IoT

With the increasingly close combination of computer technology,Internet of Things technology and greenhouses,traditional greenhouses are developing into smart greenhouses.Greenhouse monitoring,as an important part of smart greenhouses,has received extensive attention.At present,many greenhouse monitoring methods use wired communication or traditional wireless communication such as GPRS and Zig Bee,which have the disadvantages of chaotic wiring,small coverage and poor communication stability.Therefore,in order to solve the above problems,this thesis designs and develops an environmental monitoring system for agricultural greenhouses based on NB-IoT according to the characteristics of wide coverage,low power consumption,low cost,and long distance of NB-IoT technology.The main research contents are as follows:（1）According to the actual needs of the project,the greenhouse monitoring system is divided into a greenhouse data acquisition module and a greenhouse environment control module.In order to realize the function of the greenhouse data acquisition module,four low-power data collectors based on NB-IoT have been developed to monitor the ambient temperature and humidity,light intensity,soil temperature and humidity,and soil PH in the greenhouse,helping greenhouse managers anytime,anywhere.Obtain environmental information.The collector is powered by a battery,which solves the problem of complex wiring in the greenhouse and can make more rational use of the greenhouse production space.Finally,in order to ensure the battery life,a specific method to reduce the power consumption of the collector is proposed from two aspects of software and hardware.（2）A monitoring platform based on B/S architecture is designed to realize the functions of uploading data and issuing control commands in the greenhouse.Among them,the greenhouse data upload is to receive the data uploaded by the collector,parse and store it according to the custom protocol,so as to realize the query and visual display of the data.In addition,using the designed control command issuing function,users can remotely control the field execution equipment in the greenhouse through the monitoring platform.（3）In order to realize the function of the greenhouse control module,a wireless communication interface based on NB-IoT is developed,and the PLC without remote communication capability is incorporated into the Internet,so that the monitoring platform can realize the remote management of the PLC equipment in the greenhouse,integrating water and fertilizer.The machine is used as a practical application and debugged accordingly.Finally,in order to verify the performance of the system,reliability tests,acquisition accuracy tests,and power consumption tests were carried out on the system.Experimental results show that the design has high reliability,accurate data collection,and low power consumption.It proves that this system has a certain practical value,has positive significance for the application of NB-IoT technology in smart greenhouses,and has reference value for the research of NB-IoT low-power acquisition equipment.