Research Development And Application Of Greenhouse Environmental Monitoring Systembased On Heterogeneous Network

Facility agriculture has become a hot topic of modern agriculture. The application of the greenhouse monitoring technology has made the material foundation and promoted the rapid development for the facility agriculture. Traditional monitoring application based on cable transmission has the limitations of complicated wiring, poor flexibility, and difficult maintenance. Wireless sensor networks(WSN) with the advantages of flexible networking, low cost and low power consumption can make up for the above problems. But most of the existing wireless sensor network monitoring technologies just use a single Zig Bee protocol and are not suitable for long distance transmission. According to the requirements of the greenhouse crop growth environment parameters required, this dissertation constructed a heterogeneous networks which based on ZigBee and GPRS and built the hardware platform based on ZigBee to monitor the greenhouse’s temperature, humidity, light intensity and carbon dioxide concentration. The collected data is transmitted to the monitoring center through the GPRS network and the heterogeneous networks can realize the remote monitoring of multiple greenhouse environments by the collected data is transmitted to the monitoring center through the GPRS network. The main contents are as follows:(1)The hardware platform is built. At the request of the greenhouse monitoring system, the design of multi parameters, micro and low power consumption of the monitoring node is carried out. The system selected CC2530 as the main control chip, and designed three kinds of function nodes, including the terminal node, the coordinator node and the routing node. The hardware design of the terminal node selected the digital temperature and humidity sensor of SHT10, BPW34_s light sensor and MG811 carbon dioxide concentration sensor, which is used to collect the raw data. The coordinator node is used to complete ZigBee network by using the network’s PAN ID to distinguish greenhouses. In addition, the RS232 serial circuit by using MAX232 is used to enable the communication between the CC2530 and GPRS. The routing node is composed of basic circuits to forward data.(2)Zig Bee and GPRS heterogeneous networks are designed. The network has the advantages of ZigBee network flexibility, low power consumption and long distance transmission. ZigBee network used Z-stack protocol stack and the version used Z-stack2007 which specially adapted the CC2530. The program is compiled under the IAR EW8051 integrated development environment. The connection of GPRS network is done by W3100G-EC wireless data transmission module. The device is based on 2.5G communication network platform, and used for data remote transmission.(3) PC monitoring software is designed. The design of remote monitoring software is based on Visual Studio 2010 platform. Computer receives the monitoring data through the network port monitor and parsed the data to store in the database. The SQL Sever2012 is used as the developed platform. Then, the monitoring software completed the connection with the database through ADO.NET to real-time display of data query and analysis.(4) In the end, the function of the system was tested and the results showed that the packet loss rate of the Network data transmission is in a reasonable range and the system reached the expected goals which can used for agricultural environment monitoring.