Design And Implementation Of Greenhouse Monitoring System Based On NB-IoT Internet Of Things

Under the background of agricultural modernization,intelligent greenhouse has entered the track of rapid development.At present,many experts and scholars have put forward the solution of intelligent greenhouse.However,there are more or less problems in the existing intelligent greenhouse,such as high cost,complex operation,unable to realize intelligent control,which limit the popularity of intelligent greenhouse.According to the shortcomings of the existing greenhouse,this design proposes a greenhouse monitoring system based on NB-IoT Internet of things.The system adopts NB-IoT narrow-band wide internet of things technology,communication network technology,new energy technology,Java programming language technology,database technology and fuzzy control technology to realize the intelligent monitoring of greenhouse.The system collects environmental information such as temperature,humidity,light intensity and carbon dioxide concentration from the terminal control sensor,and transmits the data to the remote server through NB-IoT network and stores it in the database.The control terminal uses the Web page developed by B / S structure to call the data in the remote server and display it in the form of charts and data in the Web page.The greenhouse administrator can log in the specific Website through PCor mobile terminal and monitor the greenhouse at any time.Compared with the traditional greenhouse monitoring system,the designed monitoring system has the following advantages:(1)Compared with the traditional Zig Bee,Bluetooth and other Internet of things technologies,it has a wider coverage,simple networking,low power consumption and simple operation.WH-NB73 module supporting TCP protocol is selected for NB-IoT module to ensure reliable control of the system.(2)On the premise of ensuring the temperature and light quantity in the greenhouse,combining the greenhouse with the solar energy,the power modules in the greenhouse can be provided by the photovoltaic power generation system,making it more energy-saving and environmental protection.(3)According to the problem of power generation efficiency decreasing due to the temperature rising of photovoltaic panels,this design adopts the way of water circulation to reduce the temperature of photovoltaic panels and increase the power generation of the system.At the same time,the water temperature rising after circulation can be used for irrigation of greenhouse,change the soil humidity and improve the soil temperature,promote the growth of crops and avoid water resources Waste of source.(4)In terms of system,this design abandons the C / S structure which is widely used in the Internet of things at present,and adopts the B / S structure and Java Web technology to design the Website system.The SSH(struts +Spring + Hibernate)framework,AJAX asynchronous request technology andJXLL / JFree Chart technology are fully applied to improve the practicability and comfort of the system,reduce the development and maintenance costs and facilitate the popularization.(5)In the aspect of control,according to the characteristics of environmental factors in greenhouse,taking soil moisture as an example,this design chooses fuzzy control algorithm to control greenhouse automatically.At the same time,ARIMA model is established to predict the changes of environmental factors in the future by using the historical data of environmental factors in greenhouse,which provides data support for the management of greenhouse managers.After the completion of the system design,the existing experimental conditions are used to test the modules.The experimental results show that the system design is reliable,can operate normally,has high stability,and has practical significance.