The Chang Jang River Segment Design Load Transportation Wire Drag Force Monitoring Device

The purpose of this paper is for the Yangtze River section water facilities dragwire load overload of monitoring stress condition and design a set of monitoringequipment. the system consists of a plurality of tension collection node and areceiving node, using a PC computer as a terminal control equipment, through thewireless transmission mode, form a real time acquisition of each cable wireless datacommunication network. The whole design work mode: the whole wireless networkis a star, a tension sensor nodes will wire force data collected, the AD conversionprocess under the control of MCU, wireless communication way the data back to thereceiving end, the receiving end will receive the information, transfer to the PCmachine by USB interface, real-time display and other operations on data usingLabview software to design the interface. This article from three aspects of hardware,software and network structure are studied.The hardware part is in accordance with the idea of modularization, the dataacquisition of three parts module, wireless transmission module, computer moduledesign. Data acquisition module mainly involves the sensor type and the typeselection of AD converter, selection criteria and selection, this paper uses CKY-126type tension sensor is developed Beijing aviation instrument measuring andControlling Technology Co. Ltd. and America AD company produced the AD1674AD converter. Focus on wireless transmission module of this paper, from theperformance, the working frequency, transmission distance, the difficulty ofprogramming, anti-interference ability, internal integration and other factors of thechip, the final choice of microcontroller nRF905wireless transmission chipSTC11F02E microcontroller Shenzhen macro crystal production company and theNorway NORDIC VLSI company, and then the design of the a crystal oscillatorcircuit, the system power supply module, voltage stabilizing circuit. The main contentof PC module is connected with the PC receiver chip selection, in comparison withthe USB interface and serial connection modes, selected the USB connection method,the USB chip PL2303circuit diagram and object diagram are given.The software part mainly the same in accordance with the modular idea, given the various modules of the program flow chart and some source code, mainlyintroduces the wireless transmission module for nRF905wireless chip initialization,configuration registers and how to accept the MCU instructions through the SPIinterface of the working principle. The PC module using Labview graphicalprogramming software is designed to monitor the man-machine interface, includingthe main control interface, alarm interface settings, historical data display interfaceand data curve display interface four interface.The wireless transceiver module at the end of this design has been completed bythe transceiver function and accept the distance test, and to improve the reliability ofthe system is analyzed.