Development Of Intelligent Monitoring And Controlling System For Greenhouse Environment

Installed agriculture is a new agricultural industry in the 21th century. Greenhouse is one of the typical representative. At present, main hardware in greenhouse can be self-supported in the mainland, but the monitoring and controlling system is mostly imported, and three are many exiting problems in both quality and efficiency. So the solution to the problems depends on the development of monitoring and controlling system according with the situation of china, and the significance for increesing benefit and quickening modern degree of greenhouse production is discussed.Based on summarizing the former studies, the paper analyzes environmental parameters, the integrated controlling charecteristic of greenhouse system and complicated controlling process. It is difficult to establish the precise mathematical model and corresponding mathematic relation becouse of the interaction between environmental parameters and the delay of no-linear greenhouse systems which is changed frequently. So, the traditiional control metheds can not work but it would be successful to apply fuzzy control strategy in greenhouse environment.It is an effective methed to solve unstable systems because fuzzy control system is based on operators' controlling experience. In this paper, fuzzy control theory is applied in temperature and humidity control in greenhouse, and fuzzy controller is designed. At the same time, applid software MATLAB is used to simulate the tempeature controller. The output shows that the system is stable and the result is satisfied.Greenhouse system is a small distributed monitoring and controlling system composed of the upper and lower computers. The upper computer, PC computer, was the headquarters of the system; The lower computer, 8031 single-chip microcomputer, is located in greenhouse; and the two parts can communicate through RS-232C line. By serial communication, data collected by 8031 was transferred real-time to PC and was displayed, saved, printed and managed. Simultaneously, the 8031 single-chip microcomputer can look up fuzzy control table through a certain algorithm and sent out controlling signals to drive the relay. In addition, environmental parameters can be set dynamically on the MCU.The system software included upper computer system software and lower computer system software. Method of structural module was adopted in the design of the system software. The upper computer system software was developed with VC and composed of 4 modules, such as communication, real-time data collecting, recurring of history data andhelp module. The lower computer system software was developed with 8031 assemble language and composed of modules of main program, time interrupt service routine, receiving interrupt service routine, data collection subroutine and data processing subroutine.The system has a favorable operating environment and friendly interface; and it was easy to operate, upgrade and extend, and lay a technical foundation for realising control system design with many factors in greenhouse environment.