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Design of Soil Moisture Wireless Data Collection System Node Based on ZigBee

Author: HanTingGe
Tutor: LiShuQin
School: Northwest University of Science and Technology
Course: Applied Computer Technology
Keywords: JN5139 ZigBee technology Soil moisture Wireless sensor networks
CLC: TP274.2
Type: Master's thesis
Year: 2010
Downloads: 277
Quote: 3
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Abstract

In recent years, a growing problem of water shortages, countries pay more attention to the problem of the efficient use of water resources. As a large agricultural country, although the total freshwater resources largest in the world, but the per capita water resources are only equivalent to 1/4 of the world average, it is one of the world's per capita water resources in the poorest 13 countries. Nevertheless, the waste of water resources in China is still very serious, accounting for 80% of total water consumption of society agricultural water utilization is very low, far below the world average. Therefore, changing the business model with extensive traditional agriculture, the development of precision agriculture, crop water demand for accurate monitoring, timely and appropriate amount of irrigation on crops necessary. In a wide range of monitoring, wireless sensor network has a unique advantage. Relative to the traditional wired communication, wireless sensor networks can be an effective cost savings, and will not affect farming. Through a wide range of many nodes can collaborate acquisition object information within the target area, and can be transmitted by wireless to the observer. In the field of low data rate, low power consumption, ZigBee technology has incomparable advantages. ZigBee operates in the 2.4GHz band for free, network capacity, low cost, low power consumption is the main advantage. These features based on ZigBee, it is very suitable for the application of soil moisture detection This article describes how ZigBee protocol-based development of soil moisture monitoring node. The paper first introduces the concepts and features of wireless sensor network, and then introduces the research status of wireless sensor networks in agricultural irrigation applications, and then compared the wireless sensor network technology. The paper then of the ZigBee protocol is described in detail, including network constitutes the network topology, protocol stack. Node deployment and data fusion technology is introduced in the third chapter. Chapter collection node hardware structure, including sensors, microprocessors, wireless transceiver chip, serial and analog-to-digital conversion module. In the fifth chapter on how to form a mesh network, mesh network node function analysis, and completed the software design of each node. The programming environment used by the software design, compile, debug method. Node to use Jennic EK000 development board for hardware development platform. The Jennic EK000 provide peripheral expansion, including the extension pin power supply. The JN5139 microcontroller JN5139 M0 wireless transceiver chip A / D conversion module completed the hardware architecture of the node. CODE: BLOCKS for software using open source integrated development environment, which GCC compiler and GDB debugger integration download tools and Burn tools will be cross-compiled code is downloaded to the target board. Development nodes flexibility to form a mesh network and the completion of the data collection, transmission and other functions.

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