Nodes Design Of The Eco-hydrological Data Acquisition System Based On ZigBee

With the development of sensor network technology and communication technology,eco-hydrological data acquisition system has shown the tendency of the intelligence,standardization, networking and information technology development. Heihe water allied telemetry experimental research(Hi-WATER), based on the basin observation system of Heihe, is a comprehensive observation test carried out in Heihe basin from 2012 to 2015 with the integration of satellite, aerial remote sensing and ground of researchers with multidisciplinary background and from various institutions.The whole eco-hydrological data acqusition system network was studied.This thesis studies the whole eco-hydrological data acquisition system network. Centered with ZigBee technology, a laboratorial acquisition system is established and nodes of system are designed especially,aiming to solve the eco-hydrological data acquisition problem underlying nodes in the bottom of observation network in order to provide reliable data for the allied telemetry.First of all, based on the ZigBee network design, the general design of system hardware is introduced, and hardware equipment and the composition of the node modules are illustrated in detail. Core parts of the circuit diagram are also offered.Secondly, according to the characteristics of system and its environment, system software is given, with extra attention paid to ZigBee network design and detailed description given to software part of nodes modules. ZigBee network is optimized with the introduction of mZig technology to solve the problem of packet collision, and Qt is applied in the development of PC software, making the system function more completely.Finally, the result of test is introduced in this thesis, mainly including ZigBee network experiment and wireless transmission quality testing. The result of online testing from hardware to software shows system can run stably and reliably.The innovation of the design also includes associating ZigBee with eco-hydrological field and optimization of ZigBee network. The principle of packet conflict is analyzed and corresponding solutions are also provided, which improves communication efficiency of ZigBee technology. These are the innovation and finally the design achieves the intended target.