基于单片机的超声波测距倒车雷达--毕业论文.doc

### ######### 本科生毕业论文（设计 基于单片机的超声波测距倒车雷达 Based on single chip ultrasonic reversing radar 独创性声明 本人声明所呈交的论文是我个人在导师指导下进行的研究工作及取得的研究成果。尽我所知，除文中特别加以标注和致谢的地方外，论文中不包括其他人已经发表或撰写过的研究成果，也不包含为获得商洛学院或其他教育机构的学位或证书而使用过的材料。与我一同工作的同志对本研究所做的任何贡献均已在论文中作了明确的说明并表示了谢意。 学位论文作者签名： 日期： 关于论文使用授权的说明 本人完全了解商洛学院有关保留、使用学位论文的规定，即：学校有权保留送交论文的复印件，允许论文被查阅和借阅；学校可以公布论文的全部或部分内容，可以采用影印、缩印或其他复制手段保存论文。 □公开 □保密（____年____月） (保密的学位论文在解密后应遵守此协议) 签名： 导师签名： 日期：  本次设计主要是利用STC89C52单片机、超声波传感器完成测距报警系统的制作，以STC89C52为主控芯片，利用超声波对距离的检测，将前方物体的距离探测出来，然后单片机处理运算，与设定的报警距离值进行比较判断，当测得距离小于设定值时，STC89C52发出指令控制蜂鸣器报警。 关键词：超声波；STC89C52；倒车雷达；单片机  Based on single chip ultrasonic reversing radar  Abstract:Auto industry brought growth and prosperity of the large increase in car ownership. However, the growth rate of car ownership also brings problems such as frequent road congestion and traffic accidents. Through statistical analysis: reverse process easily lead to accidents, and how to simplify the reverse process, and improve the safety of the reverse process is vital. Back in all sorts of auxiliary system, the distance is the most common methods for environmental detection, in the car distance ways, the most mature, also is the most practical support to reverse the process of ultrasonic ranging. Ultrasound has certain good physics characteristic, make it widely used in various fields. The in common use method of ultrasonic ranging has time difference method and pulse method, etc. The pulse method to implement simple, low cost, applicable range wide, so choose this method. The speed of ultrasonic wave in air is mainly related with the temperature, so the ranging system need to get to the temperature of the external environment. Ultrasonic wave in air attenuation, there are 40 KHZ ultrasound is the most suitable for ultrasonic ranging applications. STC89C52 is on STC series single-chip computer is widely used in