Dissertation > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Automation systems > Automatic control,automatic control system

An Advanced Intelligent Control System Used in Greenhouse Based on WSN

Author JiangYuan
Tutor WangJianHua
School Jiangsu University of Science and Technology
Course Signal and Information Processing
Keywords Intelligent Control Precise planting Wireless sensor networks ZigBee technology CC2430
CLC TP212.9;TP273
Type Master's thesis
Year 2011
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Our country is an the historic agricultural country, the basic conditions of the \The efficiency of agricultural production has become an important topic in the current construction of modern agriculture. Greenhouse cultivation as a very important form of modern agriculture in China's rapid development, China has the world's largest production of vegetable protection area. Effectively improve the greenhouse cultivation production efficiency low input and high output, must rely on the state-of-the-art agricultural automation technology and equipment, the greenhouse planting environment for real-time acquisition and control to ensure the best environment for the growth of crops. The market is widely PLC, microcontroller or fieldbus technology-based wired control system, although the technology is mature, but in terms of wiring, cost, production scale scalable such limitations. The paper to focus on the limitations of the system, explore monitoring solutions based on wireless communication technology; abandon Western developed countries, based on GIS, GPS technology Daejeon precise cropping systems program, exploring and establishing another wireless sensor network technology based on ZigBee technology intelligent control systems. The system uses wireless sensor networks to achieve real-time acquisition of agricultural information, networking and data communications using ZigBee technology, the selection of the optimal path based on the destination address by routing nodes, agricultural information is sent to the PC virtual control terminal, and in the light of the the expert database parameters control command is sent to the the corresponding greenhouse base station to control the peripheral electrical equipment, and ultimately realize the system function. Paper made intelligent greenhouse control system based on wireless sensor networks in detail. The system consists of sensor nodes distributed in the canopy (terminal equipment), the greenhouse base station (router nodes) and a PC terminal nodes (network coordinator) three parts. Collection of agricultural information the sensor node responsible for temperature, humidity, light intensity, and CO 2 concentration, greenhouses base station for agricultural information summary forwarded canopy electrical equipment control, PC terminal responsible for the summary of the information and PC virtual control communication platform. Choice of adaptive networking and data communication routing algorithm, the paper analyzes the system based on the ZigBee network node tree topology adaptive routing selection algorithm. The algorithms in the the LEACH hierarchical routing algorithm based on analysis of the defects of the algorithm and improved. NS2 simulation results show that the improved algorithm overall network energy consumption steadily decreased greatly improve the network life cycle. System testing, the architecture design is reasonable, better implementation of the functional circuit the system is stable, excellent performance, low cost, to achieve the expected indicators has certain promotional value.

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