摘要：课题的主要内容是用单片机设计一个汽车倒车系统，所涉及到的内容包括电路设计、单片机以及C语言的知识。本文章介绍了硬件控制的原理和方法，提出了以下的问题：单片机是如何对周围硬件进行控制的，以及如何实现数据的读取和控制的。还要研究的问题是单片机是如何从测量传感器上进行数据读取，将外界温度读取到单片机内。进过分析，可知汽车倒车监控系统由超声波传感器，显示器，控制器，温度传感等部分组成。计算车距用到了超声波接受模块和超声波发射模块。通过分析得到的结论是需要用超声波测距原理来实现本次的实验，要了解超声波传感器的特点和性能。本课题遇到的问题就是需要用汇编语言来实现汽车倒车的测距，来进行汽车与障碍物的距离测量，从而进行数据的显示。编写程序是本课题的难点，我通过查阅了c语言编程的书籍，一步一步学习如何编程，最终完成程序的编写。72944

毕业论文关键词：汽车倒车；单片机 ；超声波传感器；距离测量

    Design and Application of Precision Distance Measurement System

  Abstract:This topic is the design and application of the precision ranging system。 The task of the task is based on the single chip computer system。 The design of the hardware circuit and the program is designed by using the sensing and control technology to realize the design of the vehicle reversing monitoring system to realize the monitoring and alarm。

   The main content of the project is to use a single chip design a car reversing system, the contents involved include circuit design,  single chip and C language knowledge。 This article describes the principles and methods of hardware control, how the  single chip is to control the surrounding hardware, and how to read and control the data。 Car reversing monitoring system consists of ultrasonic sensors, monitors, controllers, temperature sensing and other components。 Calculate the vehicle distance from the ultrasonic receiver module and the ultrasonic transmitter module。 The main research of this topic is the principle of ultrasonic distance measurement, and the characteristics and performance of ultrasonic sensor, the design of single-chip microcomputer。 But also to study the problem is how the  single chip from the measurement sensor for data read, the external temperature read into the  single chip。 How is the  single chip from the measurement sensor for data read, the external temperature read into the single chip。 But also need to use the assembly language to achieve the car reversing the ranging, to carry out the distance measurement between the car and the obstacles, so the data display。

Key words: Car reversing；single chip；ultrasonic sensor；distance measurement

                       目录

摘要 i

Abstract ii

目录 iii

1。绪论 1

1。1 课题的目的和意义 1

1。2 国内外研究现状与发展趋势 1

1。2。1 国内外研究现状简介 1

1。2。2 发展趋势 2

1。3 课题的主要工作 2

2。 汽车倒车的工作原理 3

2。1超声波传感器系统 3

2。1。1 超声波传感器简介