超声波倒车防撞报警系统

摘 要:本设计采用以AT89S52单片机为核心的低成本、高精度、微型化数字显示超声波测距仪的硬件电路和软件设计方法。整个电路采用模块化设计，由主程序、预置子程序、发射子程序、接收子程序、显示子程序等模块组成。各探头的信号经单片机综合分析处理，实现超声波测距仪的各种功能。在此基础上设计了系统的总体方案，最后通过硬件和软件实现了各个功能模块。相关部分附有硬件电路图、程序流程图。

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经实验证明，这套系统软硬件设计合理、抗干扰能力强、实时性良好，经过系统扩展和升级，可以有效地解决汽车倒车、建筑施工工地以及一些工业现场的位置监控。 [资料来源：http://think58.com]

关键词：单片机；超声波；测距

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Abstract：At the core of the design using AT89C51 low-cost, high accuracy, Micro figures show that the ultrasonic range finder hardware and software design methods. Modular design of the whole circuit from the main program, pre subroutine fired subroutine receive subroutine. display subroutine modules form. SCM comprehensive analysis of the probe signal processing, and the ultrasonic range finder function. On the basis of the overall system design, hardware and software by the end of each module.

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The research has led to the discovery that the software and hardware designing is justified, the anti-disturbance competence is powerful and the real-time capability is satisfactory and by extension and upgrade, this system can resolve the problem of the car availably, building construction the position of the workplace and some industries spot supervision. [资料来源：THINK58.com]

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Key words: single-chip microcomputer；silent wave；measure distance
 

目  录 [资料来源：http://www.THINK58.com]

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1  绪论···························································1

     1.1   课题设计的目的及其意义·································1 [来源：http://www.think58.com]

     1.2   超声波测距仪的设计思路·································1

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1.3   课题设计的任务和要求···································2

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2  课题的方案设计与论证···········································3

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     1.1   系统整体方案的设计·····································3 [版权所有：http://think58.com]

     1.2   系统整体方案的论证·····································3 [资料来源：www.THINK58.com]

3  系统的硬件结构设计·············································4

     3.1   单片机的功能特点及测距原理·····························4

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     3.2   时钟电路·········································11 [资料来源：http://THINK58.com]

     3.3   复位电路·········································12 [资料来源：http://think58.com]

     3.4   LED显示电路·········································12 [来源：http://www.think58.com]

     3.5   超声波发射电路·········································14

     3.6   超声波检测接收电路·····································15 [资料来源：http://THINK58.com]

     3.7   超声波测距系统的硬件电路设计···························15 [资料来源：THINK58.com]

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