本科毕业设计（论文）
外文翻译
Greenhouse Wireless Monitoring System Based on the ZigBee*
作者：Minghua Shang, Guoying Tian, Leilei Qin, Jia Zhao, Huaijun Ruan, and Fengyun Wang
国籍：China
出处：CCTA 2012, Part I, IFIP AICT 392, pp. 109–117, 2013.
Abstract. Designed a WSN-based wireless monitoring system for greenhouse environment. The overall structure of the system is introduced. The design and realization of the monitoring node, the gateway node and the upper computer system are respectively described. Through the practical application in the greenhouse, it is proved that the system comprehensive performance is significantly better than the traditional greenhouse monitoring system.
Keywords: Greenhouse; Monitoring;WSN; ZigBee.
Introduction
The traditional greenhouse monitoring system is mainly based on the cable communication mode which has a series of questions such as complex wiring, difficult maintenance, inflexible deployment for sensor nodes and so on. These questions limit the popularization and application of greenhouse monitoring system to some extent. With the rapid development of modern information technology, there are many kinds of wireless communication technology such as WiFi,bluetooth,ZigBee and so on.WiFi and bluetooth etc cannot be widely used in greenhouse monitoring field because of its high cost and large power consumption etc shortcomings. As a brand new information acquisition and processing technology, the wireless sensor network based on ZigBee has a big scale, small volume, low cost, AD hoc network etc characteristics which has wide application prospects in agricultural environment monitoring field.
In view of the problems and shortcomings occurred in the current monitoring system of greenhouse environment, a wireless monitoring system for greenhouse is designed in this article which has designed low power consumption, low cost, flexible networking, friendly interface, convenient on-site and remote management. It is successfully applied.
Overall Design
System Requirements Analysis
The environment in greenhouse has many features such as large temperature difference between daytime and nighttime, large air humidity, bad gas exchangeability, poor light intensity, strong soil acidity and so on. There are more crop species planted in greenhouse with dynamic change. The monitoring area is large and monitoring parameters are too many. In addition, the farmer is also very sensitive to whole cost and reliability of monitoring system. Through investigation and analysis, most of the current acquisition demand for greenhouse monitoring environmental parameter is mainly focused on six factors i.e. air temperature and humidity, soil temperature and humidity, light intensity, concentration of CO2. In addition, a few greenhouses also need to collect EC value, pH value of nutrient solution and outdoor weather factors and other information. The quantity of sensor nodes can increase or decrease at random and the nodes can change its position without affecting the normal operation of the system according to crop growth, species replacement or greenhouse space structure change etc. The system is with intuitive interface, comprehensive analysis easy to use and low application cost etc.
Overall Structure
In accordance with the characteristics of greenhouse monitoring system and the above mentioned function demand, this paper integrates the wireless sensor network technology, ZigBee technology and embedded technology to design the wireless sensor network monitoring system based on ZigBee for greenhouse. The whole system hierarchy is shown in figure 1.
Fig. 1. Framework of the greenhouse wireless monitoring system
The system consists of monitoring node, gateway node and a host computer three layers. Monitoring node includes sensor node and actuator node deployed in greenhouse monitoring region which is automatically establish unified wireless sensor network through the ZigBee protocol. Each sensor node collects the real-time greenhouse environment data to the gateway node by multi-hop routing mode, the actuator nodes receives the real-time control orders from gateway node to control the fan etc actuating mechanism. The gateway node realizes the local communication through the serial port or remote communication through the Ethernet and GPRS etc modes which provide the sending support for monitoring data and control data. Host computer system provides a user interface to realize the interactive management operation between the user and system.
Monitoring Node Design
Hardware Design
Monitoring nodes are the base of greenhouse monitoring system which is the basic unit to information perception, executive control and network function of wireless sensor network. According to different division of labor, monitoring nodes are divided into the sensor node and actuator node which are introduced as follows.
Sensor nodes
The hardware design core of sensor node is microprocessor chip. The microprocessor of node finishes data acquisition, data processing, wireless communications etc functions in collaboration with the wireless transceiver module. The hardware structure diagram of wireless sensor node is shown in figure 2. The hardware design of wireless sensor n
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