Research And Application Of Key Technologies Of Greenhouse Remote Monitoring And Control System

Agriculture is the foundation of every national economy,hence a sustainable agricultural development is mandatory and requires an immediate solution.Intelligent greenhouse has the capability to achieve a high quality and high crop production in agricultural production and with the recent trends in development and innovation of electronic information techology,agricultural greenhouse monitoring technology systems is also transformed to automated systems.Therefore,the study of greenhouse control system technology has an important significance for the development of China's modern greenhouse.This research focuses on the full functionality and performance requirements of modern greenhouse management platform both locally and abroad,and summarizes the key technologies fundamental to greenhouse remote monitoring system.This system deployed a wireless networks to collect the environmental information based on PLC control technology,using SQL Server as database platform and ASP.NET as a dynamic web technology,socket communication technology,ADO.NET database access technology,the communications technology of PC and PLC,fuzzy control technology comprehensively to realize the remote management and control of greenhouse environment information.This paper completes the following several aspects of work:(1)Sensors collect the greenhouse environment information through socket communication to the PC server and stores the data to the database.FX2N series PLC connects with PC and realizes no protocol communication by using the SC-09 interface.The user sends the organization control command to the PLC controller which then analyzes the control commands through the instruction table,and controls the greenhouse environment by the greenhouse mechanism.(2)Web management platform includes system information module,the environmental parameters in real-time display module,the environmental parameters curve display module,the user login module and remote control module.These five modules page were designed using ASP.NET technology.The SQL Server database technology was used to design the database.(3)Greenhouse main environmental factors(temperature,humidity,light intensity,CO2 concentration)that affect crop growth and their corresponding control actuators were researched.The basic principle of fuzzy control was implemented considering the characteristics such as time-varying parameters,unevenly distributed and multi-variable coupling of the greenhouse environment.The dimensional fuzzy controller was chose in(?)consideration to the actual situation of the greenhouse and designed combining the experience of the management and expertise.System was tested and implemented for more than a year at Haimen Delight Vegetable Co-operatives Base and New Rural Development Research Institute of Nanjing Agricultural University Base where it proved to be reliable,stable and safe.Thus the system achieves the effective management of greenhouse environment information.