注：辽宁机电职业技术学院2016度院级教研课题（NO.JXLX2016）
作者：刘娜
单位：辽宁机电职业技术学院，辽宁丹东 118009
中图分类号：TP273       
文献标识码：B      
文章编号：1006-883X(2016)04-0033-05
收稿日期：2015-12-07

摘要：司机在倒车时主要借助反光镜和后玻璃窗来观察车后障碍物，但总有死角存在，长车身车辆倒车更是不便。介绍一种基本单片机控制的超声波倒车测距仪，能解决以上问题，成本低、体积小、随意拆卸，还可以做为单片机实训课题给学生使用。测量距离2cm~4m，精度为3mm，对温度进行补偿以提高精度。测量结果能实时显示在汽车里的液晶屏上，同时进行语音提示。可以任意设置最小报警距离，达到极限值时，声光报警。通过以电子产品为载体的单片机实训课程，学生不但提高了学习兴趣，还为将来从事电子产品的设计、检测奠定了坚实的基础。
关键词：单片机；超声波；倒车测距仪

Reverse distance measuring system  based on SCM and ultrasonic
LIU Na
Information Department ,Liaoning Jidian Polytechnic, Dandong 118009, China
Abstract: Drivers observe obstacles behind vehicles with the help of retroreflectors and rear windows mainly .But dead angles always exist, especially for those vehicles with long bodies. In order  to solve the problems above, a ultrasonic reversing distance measuring system based on SCM with low cost, small size and free disassembly is designed in this paper. It also can be used as a SCM training topic for students. The system has characteristics with measuring range of 2cm~4m and accuracy of 3mm. The temperature compensation is done for improving the accuracy. Measurement results can be displayed on the LCD of vehicle in real time, at the same time the sound prompt is given. The minimum alarm distance can be set freely. The sound and light alarm are presented as the measured distance exceeds the threshold. The SCM practical training courses with electronic products as the carriers not only improve the students learning interest, but also lay a solid foundation for their electronic product design and testing work in the future .
Keywords: SCM; ultrasonic; reverse distance measuring system

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备注：2016年 第22卷 第04期