摘 要 超声波具有很强的指向性，消耗能量缓慢，距离传播较远等优点，所以，在利用自动化控制技术和传感器应用技术相结合的测距方案中，利用超声波专有特性测距是目前最普遍的一种方式，它被广泛地应用于防盗、倒车雷达、水位测量、建筑施工施工场地以及一些工业现场。本论文详细的介绍了超声波传感器的原理及特性，并且介绍了 Atmel 公司的AT89C52 单片机的性能与特点，且在分析了超声波测距原理的基础上，指出了本次方案的思路和所需考虑的问题，给出了以 AT89C52 单片机为核心，LCD 显示电路，硬件制作和软件设计为一体的设计方案。关键字：超声波测距；单片机；测距；AT89C52；LED 显示屏Abstract Ultrasonic wave has strong pointing to nature ,slowly energy consumption ,propagating distance farther ,so, in utilizing the scheme of distance finding that sensor technology and automatic control technology combine together ,ultrasonic wave finds range to use the most general one at present ,it applies to guard against theft , move backward the radar , water level measuring , building construction site and some industrial scenes extensively. This subject has introduced principle and characteristic of the ultrasonic sensor in detail ,and the performance and characteristic of one-chip computer AT89C52 of Atmel Company ,and on the basis of analyzing principle that ultrasonic wave finds range ,the systematic thinking and questions needed to consider that have pointed out that designs and finds range .Given the AT89C52, LCD display circuit, the hardware and the software design production.Keywords：ultrasonic ranging；single-chip；Range finding；AT89C52；LCD display目 录第一章 引言...............................................51.1 单片机应用系统概述..........................................51.2 超声波测距系统概述..........................................61.3 本设计任务的主要内容.........................................6第二章 超声波测距的原理.................................
