| China is a large agricultural country, the development of greenhouses has an unparalleled resources and potential. But our greenhouse is still in its infancy, there are many problems such as facility structure is irrational, serious waste of resources, the high cost of operation and management, low level of technology management and low yield per unit area. Therefore, the need for a unattended monitoring and management system capable of real-time, dynamic monitoring and management.Recent years, with the rise of the Internet of Things technology, development of communication technology and the popularity of embedded technology, embedded control systems and wireless sensor network technology are more widely used, especially in recent years3G network popularity which provides the conditions for the formation of large-scale remote monitoring, user can remotely monitor and manage the greenhouses through the network, at the same time,image compression technology of network-based video surveillance system and network transmission technology provide the possibility for wireless transmission of video.Through the analysis and feasibility study of greenhouse, a new greenhouse unattended monitoring system solutions are provided. The programs are primarily divided into three parts:the ZigBee wireless sensor network data acquisition part, embedded host part and the remote server part. We only study the first two parts.ZigBee wireless sensor network data acquisition section includes:ZigBee terminal nodes, routing nodes and the coordinator node.The terminal node has the temperature, humidity and light sensor module, terminal node is only responsible for the collection and transmission of data; routing node has a routing function, but also both the function of the terminal node; coordinator node is responsible for network structures, receiving the data from other nodes, and transmitting the date through serial port to the embedded host device.TI’s CC2530chip are used for ZigBee nodes and Z-Stack2007protocol stack are used for finishing the program design.The embedded host part includes the embedded monitoring terminal and3G dial-up. Embedded monitoring terminal completes the data collection in two ways, on the one hand, through the serial port to read and analysis the sensor data from the coordinator node to open or close greenhouse automation equipment; On the other hand,through the Linux system V4L2driver module to get the video date, and encode the video data by the S3C6410chip MFC unit. Terminal through3G wireless dial-up module to access3G mobile networks, access the Internet network by the network operator’s base station, finally the two parts of the collected data through the Internet are sended to the remote server. Remote servers receive and save the data, sensor data is stored in the server database,they can real-timely display by a software application, video data is stored on the hard disk, they also can be played. Video capture device is a USB camera, transmission uses the TCP protocol.3G dial-up part uses the Huawei EM770W module and China Unicom’s WCDMA standard.Final embedded host can upload date to the server-side with the rate of about300Kbit/s, server-side can play the video date and observe temperature,humidity and light value real-timely. Meanwhile,embedded host can automatically open and close the equipment of the greenhouse (shade net, humidifiers, hair dryer, sprinkler).Finally,achieve the purposes of monitoring and managing automatically. |
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