A Greenhouse Intelligent Controller Based On WSN And Embedded System

With the improvement of people’s living standard, the demand for high-quality andanti-season agricultural products (which should not grow and mellow in autumn and winter)increased year by year. Therefore, to accelerate the urbanization and industrialization inour country can make the facility agriculture speed rapidly toward modernization, and atthe same time, it is one of the major tasks of "12th five-year" period in our country.Among the period, promoting agriculture industrialization and informationization is themain contents of development of agricultural facilities. At present the running of ourcountry facility agriculture production is mainly in small scale, the technology level is low,under the technology a few of simple measuring equipment, such as thermometer,hygrometer and so on are used. The greenhouse environment control depend on farmers’experience, the level of mechanized operations is lower and the labor cost is larger. Fewmechanical controlled greenhouses adopts industrial computer as the controller, it takes uplarge space and costs much. At present, in China there are few suitable low cost and highaccurate control system for the greenhouse environment.This thesis presents design considering about the actual level of facility agriculturedevelopment in our country. The greenhouses of fruit and vegetable production base inZhang Yi County, Shenyang City is take as typical object, a intelligent greenhouseenvironment monitoring system with sensor CC2430and central controller S3C2440isdesigned.In order to improve the network utilization and prolong the network life, anenergy-saving algorithm is adopted. The Zigbee wireless sensor network (WSN) based onthe IEEE802.15.4protocol is used to collect and send temperature and humidityinformation in the greenhouse environmental. The central processing unit fusion, analysisand process the data sent through a wireless network. Analytic hierarchy process intelligentcontrol strategy is adopted aiming at highest dry matter content of crop to obtainreasonable automatic control. The central processor S3C2440, an embedded processor andbelong to ARM9series, is taken as the core, and linux operating system and QT GUIdevelopment language. By cross-compiling and system migrating the application program is download to the TQ2440board. The system can display real-time information andautomatically control the environment of greenhouse.This design had been test by simulation and actual experimental in greenhouses. Theresult of experiments show that the control system of greenhouse environment is stabilityand effective. The use of this system improved the quality of agricultural products, weakenthe impact of climate on grow of crops, so the system should be widely used in modernagricultural production in our country, especially in north country.