3.Through the use of micro processor LPC2138, control of the giant magnetoresistance sensor data acquisition and rf module to send and receive data. Its smallest encapsulation and lowest power consumption, increase the stability and feasibility of the system. In each of the wireless nodes, giant magnetoresistance sensor after the node of traffic information collection, the signal amplification and A/D converter to the LPC2138, the processed to transmit information through radio frequency module to the master node. Verified by the experiment, the use of the chip can be accurate to complete the above function, theoretical analysis is verified the correctness of the design.
1、利用HMC1021Z巨磁阻传感器，传感器电路中使用滤波电路使输出信号更加稳定，该电路中还使用运算放大器，可使芯片的输出电压信号放大以便在有铁磁物体经过传感器附近时输出供处理器使用的高电平信号，实际测得巨磁阻传感器可正常运行，并可较为精确的计算通过交通信号灯的车流量大小。
2、收发单元利用射频模块，将处理器处理后的信息传送到交通信号灯控制中心，以便在不同车流量情况下更好的控制交通信号灯。经试验测量后，射频模块工作状况良好，可精确传送经处理器处理过的信息。
First consult literature at home and abroad to understand the topic research background, the working principle of magnetic resistance sensor and the principle of ferromagnetic material influence on the surrounding magnetic field, and to understand the structure and function of the microprocessor. The design scheme of the whole system, and through further study and improve the existing design. Draw the circuit diagram, design scheme can be converted to map, cast slice, complete the construction of the hardware platform. For software programming, and hardware debugging. The software and hardware together, simulated road experiment. This topic by reference to the design of the intelligent transportation system both at home and abroad and the magnetic resistance sensor research, design and the use of giant magnetoresistance sensor radio frequency module, a microprocessor based on wireless sensor network is composed of intelligent transportation system, in the design process of the main results were as follows:
2.The transceiver unit using radio frequency module, after processing the information sent to the traffic light control center, under different traffic conditions in order to better control the traffic lights. After test measurements, rf modules work in good condition, can accurately convey information treated by the processor.
ing HMC1021Z giant magnetic resistance sensor, the sensor circuit is used in filtering circuit make the output signal is more stable, the circuit is also used in the operational amplifier, can make the output voltage signal amplification of chip in order to have a ferromagnetic objects pass near the sensor output for the processor using high level signal, the actual measured giant magnetoresistance sensor can run normally, and can be more accurate calculate the size of traffic through the traffic lights.
ZigBee as a new wireless sensor network (WSN), with low power consumption, low cost, etc. Introduces the intelligent transportation simulation flat in a small area
4、该系统实现了集数据采集、处理，以及由交通信号灯显示控制结果等基
本的功能于一体的传感器智能化设计，经过试验证明该系统具有可行性与稳定性。
5、提出了将所设计的传感器应用于智能交通系统中的方案。
关键词：无线传感器网络；智能交通系统；ZigBe；网络模型；路由技术
Abstract
Intelligent transportation system will be information technology, electronic control technology and network technology and other high and new technology comprehensive application in the transportation management system.
专业班级：电气自动化1101班学生：旭恒指导教师：高立兵讲师系别：机电工程系
2014年3月
摘要
智能交通系统将信息技术、电子控制技术及网络技术等高新技术综合应用于运输管理体系。
ZigBee作为一种新兴的无线传感器网络，具有功耗低、成本低等特点。介绍
了在小区域智能交通模拟平
台上使用无线传感器网络的实例，建立了信息发布／订阅和信号控制系统。重点介绍了系统的节点硬件、ZigBee协议的数据传输以及两个子系统的软件设计针对目前中国的交叉路口多，车流量大，交通混乱的现象研究一种控制交通信号灯的基于无线传感器的智能交通系统。
This article mainly introduced the use of HMC1021Z giant magnetoresistance sensor and microprocessor LPC2138, rf modules of the application of wireless sensor network in intelligent transportation, this paper research content is as follows:
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毕业设计
专业：电气自动化班级学号：201103010108学生：旭恒指导教师：高立兵讲师
二〇一四年三月
有色冶金职业技术学院毕业设计
基于无线传感器在智能交通系统中的应用
Based on the wireless sensor in the application of intelligent
transportation system
4.The system has realized the collection of data acquisition, processing, and by the basic function such as traffic lights display control results in the integration of intelligent sensor design,ห้องสมุดไป่ตู้after tests showed that the system has the feasibility and stability.
3、通过使用LPC2138微处理器，控制巨磁阻传感器的数据采集和射频模块的数据收发。它的最小封装和最低功耗，增加了系统的稳定性和可行性。在每个无线节点中，巨磁阻传感器收集经过该节点的车流量信息，将其信号放大并经A/D转换器传输至LPC2138，经处理后将信息通过射频模块传输至主控节点。经实验验证，使用该芯片可以精确的完成以上功能，验证了理论分析设计设计的正确性。