超声波定位倒车防撞系统的设计
摘要:论文的内容是基于AT89C51单片机倒车防撞系统的设计,主要是利用超声波的特点和优势,将超声波测距系统和AT89C51单片机结合于一体,设计出一种基于AT89C51单片机的倒车防撞报警系统。该系统采用软、硬件结合的方法,具有模块化和多用化的特点。本文采用一种简单易行的测距原理建立了防撞报警系统,具体分析了倒车防撞系统的设计原理及各部分元件的设计方案,充分描述了超声波测距的原理及应用,并介绍了我国在超声波测距的发展现状,不过还有一些无法避免的测量误差,还需日益俱进的科学发展加以解决。
关键字: AT89C51;超声测距;倒车防撞
Design of reverse collision avoidance system for ultrasonic positioning
Abstract: Contents of this paper is to design AT89C51 monolithic integrated circuit reverse collision avoidance system, mainly using ultrasound features and advantages of the ultrasonic ranging system and AT89C51 microcontroller combined in one design a reverse proximity warning system based on AT89C51 microcontroller. The system uses hardware and software combination of methods, modular and multi-use characteristics. In this paper, a simple and feasible ranging principle the establishment of a collision warning system, a detailed analysis of the design principle of reversing collision avoidance system design each part of the element, fully describes the principle and application of ultrasonic distance measurement, and introduced in the current development of ultrasonic ranging, but there are some unavoidable measurement errors, the need to address the growing both into scientific development.
Keywords:AT89C51; Ultrasonic Ranging; reversing anti
目录
1.2设计的背景、目的和意义……………………………….. 2
第二章 单片机超声波测距报警系统总体设计………………………. 3
2.1 超声波测距系统的总体方案…………………………….. 3
第三章 单片机倒车防撞报警系统各组成单元方案设计………………. 4
3.5 系统报警电路设计…………………………………….. 6
4.1.3 单片机的基本工作原理………………………….. 11
4.1.4 单片机的分类及发展……………………………. 13
4.1.5 单片机AT89C51的特性………………………….. 14
4.2.2 超声波传感器的原理及特性………………………. 17
4.2.3 超声波传感器的检测方式………………………… 18
4.2.4 超声波传感器系统的构成………………………… 19
4.3.2 显示子程序和蜂鸣报警子程序…………………….. 23
第五章 电路调试及误差分析…………………………………. 26
5.2.1 声速引起的误差……………………………….. 26
5.2.2 单片机时间分辨率的影响………………………… 27