Study Of The Greenhouse Environment Supervisory System Based On WSN

China is a large agricultural country. It is very important to improve the production efficiency and technology for agriculture. As an important part of modern agriculture, greenhouse involves broad subjects, high technology. It can improve the crop production and productivity to a more great level. So it has the strategic significance in improving the level of greenhouse industry for the development of modern agriculture.Intelligent greenhouse is an advanced type in facilities farming. It has integrated environmental control system. It can be used to accurately capture the various parameters of the greenhouse. Wireless sensor network has unique advantage as an environmental monitoring system. It combines the sensor technology, information processing and network communication technology. Its rapid layout, high survivability, high precision monitoring, large coverage area, cheap low cost, make it ideal for applications in intelligent measurement system of greenhouse. ZigBee is a simple, inexpensive, moderate transfer rate, low power consumption short-range wireless communication technology. It is particularly suited to agricultural environment monitoring control system which is small data throughput, difficult long-distance field wiring, wide data collection covering, frequent battery replacement or recharge. This paper is based on the wireless sensor network and ZigBee technology to study the greenhouse measurement system technology. Mainly to complete the following tasks:Hardware design of the sensor node:Select ATmega128L as microprocessor, CC2420 RF as transceiver chip, a number of LED modules, the node ID block, external memory and other peripheral circuits. They constitute the RF processor board. Select four digital sensor to detect the temperature and humidity, pressure, light, acceleration of gravity and power management unit to constitute a data acquisition board. In addition, I also designed the board for programming communication. RF processor board, data acquisition board and programming communication board are connected by 51 pin connector. The schematic and PCB are designed by Prote199SE.Software design of the sensor node:Given the node to node communication software, Including CC2420 initialization procedures, procedures for data transmission and data reception. Build a ZigBee Star Network by transplanting MpZBeeV1.0-3.6. Then we analyze the ZigBee Star Network and design main program of star network.