《汽车倒车报警设计》.docVIP

目 录 摘 要 I Abstract II 前言 III 第1章 绪论 - 1 - 1.1 研究背景及意义 - 1 - 1.2 国内外研究现状 - 1 - 1.3 本文研究内容 - 2 - 第2章 系统总体设计 - 3 - 2.1 方案设计与论证 - 3 - 2.1.1 控制器的选择 - 3 - 2.1.2 测距传感器选择 - 3 - 2.1.3 显示子系统设计 - 4 - 2.1.4 声音报警设计 - 4 - 2.2 系统总体结构 - 4 - 2.3 本章小结 - 4 - 第3章 系统硬件设计 - 6 - 3.1 单片机控制电路设计 - 6 - 3.2 超声波发射及接收电路设计 - 7 - 3.2.1 超声波发射电路的设计 - 7 - 3.2.2 超声波接收电路的设计 - 8 - 3.3 LED显示及报警电路设计 - 9 - 3.4 本章小结 - 10 - 第4章 系统软件设计 - 11 - 4.1 主程序的设计 - 11 - 4.2 中断处理程序设计 - 12 - 4.3 本章小结 - 13 - 第5章 硬件组装与性能分析 - 14 - 5.1 硬件组装和性能分析 - 14 - 5.2 本章小结 - 15 - 结 论 - 16 - 致 谢 - 17 - 参考文献 - 18 - 附录A - 19 - 附录B - 23 - 基于单片机的汽车倒车测距仪设计摘要Abstract With the increasing popularity of cars, collision caused by human problems are becoming prominent day by day, while the reverse impact crashes accounted for the majority. To improve the safety of car parking, the paper design a car reversing range finder system based on single chip. The system is based on 89S51 microcontroller for the control of the core, using the time difference detection to rang, in order to achieve the purpose of safe car parking. This paper proposed system design based on introducing the function of ultrasonic distance measurement system, and analyzed some of the hardware and software of car reversing warning system based on the ultrasonic distance. Hardware consists of ultrasonic transmitter and ultrasonic receiver circuit, LED display circuit, buzzer alarm circuit. Software part adopts concept of modularization design, the whole program includes main program, display routines, buzzer alarm program modules. This article also analyzes the performance of the system, indicating the error cause and solution. The design through the hardware and software design of each module, can achieve basic design requirements and meet the vehicle reversing safety indicators. Key words: single chip microcomputer ultrasonic ranging car reversing radar 前言 超声波测距仪，可以应用在汽车倒车、建筑施工工地以及一些工业现场的位置监控，也可用于如液位、井深、管道长度的测量等场合。要求测量范围在0.10-5.00m，测量精度1cm，测量时与被测物体无直接接触，能够清晰稳定地显示测量结果。由