51单片机超声波倒车测距报警系统[毕业设计].doc

I 摘要随着社会经济的发展交通运输业日益兴旺,汽车的数量在大副攀升。交通拥挤状况也日趋严重,撞车事件屡屡发生,造成了不可避免的人身伤亡和经济损失, 针对这种情况,设计一种响应快,可靠性高且较为经济的汽车防撞预警系统势在必行,超声波测距法是最常见的一种距离测距方法,本文介绍的就是利用超声波测距法设计的一种倒车防撞报警系统。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。论文概述了超声波检测的发展及基本原理,阐述了超声波传感器的原理及特性。对于系统的一些主要参数进行了讨论,并且在介绍超声波测距系统功能的基础上,提出了系统的总体构成。通过多种发射接收电路设计方案比较,得出了最佳设计方案,并对系统各个设计单元的原理进行了介绍。对组成各系统电路的芯片进行了介绍,并阐述了它们的工作原理。论文介绍了系统的软件结构,通过编程来实现系统功能。最后,通过对系统的误差分析,给出了系统的改进方案。关键字: 单片机超声波 AT89C51 II Abstract Isday byday prosperous along with the social economy development transportation shipping industry, the automobile quantity climbs inthe first mate. Traffic congestion condition also day byday serious, the collision event occurred repeatedly, has caused the inevitable person casualties and the economic loss, inview ofthis kind ofsituation, designed one kind torespond quickly, the reliability was high also amore economical automobile guards against hits the early warning system imperative, the ultrasonic wave range finding was the mon one distance range finder method, this article introduces isguards against using the ultrasonic wave range finding design one kind ofback-draft hits the alarm system. The paper isbased onthe contents ofthe AT89C51 monolithic integrated circuit reverse collision avoidance system design, mainly using ultrasound features and advantages, ultrasound ranging system and the integration with the integration AT89C51 monolithic integrated circuit, AT89C51 monolithic integrated circuit based onthe design ofa reverse collision avoidance warning systems. The system used software and hardware integrated approach ofamodular and multi-use characteristics. The paper outlines the development and the basic principles of ultrasound tests onthe principles and characteristics ofultrasound sensors. Some ofthe main parameters for the system were discussed, and introducing ultrasonic ranging system functions basis, the position ofthe system. Th