Design And Implementation Of Upper Machine For The Greenhouse Environment Monitoring System

Food is the paramount necessity of the people, and crop production is closely related to people’s life. Greenhouse as a kind of modern agricultural facilities, effectively improve the production of crops, and make anti-season cultivation possible. Our country is paying more and more attention to the development of greenhouse for more than ten years, many large farms, schools, research institutions have had the greenhouse that can monitor environment. But in our country, because of the poor operability of greenhouse control facilities, high maintenance cost,high energy consumption, and many other reasons, penetration of peasant household using greenhouse environmental monitoring facilities is still very low, and they mainly depend on artificial management to manage the greenhouse.In view of the above situation, combining with national conditions, author designs and realizes a greenhouse environment monitoring system, especially introduces the upper machine in detail. The system has many advantages,for example:easy to operation, low maintenance cost, low consumption, simple wiring in the greenhouse, and realizes the greenhouse automation management. Upper machine was compiled under the environment of Visual C++, it has friendly interface, low complexity, and is very convenient for daily use.Monitor-control nodes communicate through ZigBee technology, and coordinator node through Serial port-Ethernet port conversion equipment complete the communication between upper machine and lower machine. According to the needs of greenhouses, Ethernet port communication increase the data transmission distance. System collects and transmisses temperature, humidity, light intensity and then control devices to maintain stability of the parameter. After monitor-control nodes complete connecting automatically, users login the upper system that can communicate with monitor-control nodes and get the Network topology of ZigBee, then displays parameters in the form of real time curve on the screen. When the parameters exceed alarm Settings, System alarms and drive response actions. System can save the parameters because of the access in it. When the monitor-control nodes are offline, users also can view the historical data.Through indoor simulation test and field greenhouse integrated test, prove that the system is stable and all the function is normal. Test results show that:stability of monitor-control nodes woke stablily, and communicate normally, monitor-control nodes response the control quantity from the upper system quickly. Real time parameter curve displays stably, the screen don’t flicker, display parameters in the form of real time curve on the screen well and meet the basic requirements of the system.