基于单片机的汽车醉酒禁驾系统毕业设计.doc

摘 要 随着科技的进步，智能产品在社会生产和人们生活等方面扮演着越来越重要的角色,在我们的日常生活中智能产品已经随处可见。本文以STC89C52单片机和酒精传感器 MQ -3为核心部分，设计制造一种基于单片机的汽车醉酒禁驾系统。该系统在酒精浓度超标的环境下可以自动控制汽车禁止启动，为减少酒后驾车造成的交通事故提供了帮助。同时该系统还具有声光报警、LCD显示的功能。并且该系统可以使用在不同的监控环境下，可根据不同的环境设置不同的阈值，超过阈值即进行声光报警，并自动禁止启动汽车。该设计方案的优点是硬件电路设计简单，软件功能采用C语言编程，方便灵活。而设计用的酒精传感器具有灵敏度高、工作性能好、低功耗、低成本等优点。该系统不仅可以运用在交通检测中，还可以使用在酒厂和食品工厂发酵监控等场所。 关键词：醉酒禁驾；STC89C52单片机；酒精传感器；阈值  Abstract With the progress of science and technology, intelligent products in social production and people life, playing an increasingly important role in our daily life, intelligent products has been everywhere. This paper takes the STC89C52 single chip and alcohol sensor MQ -3 as the core part, the design and manufacture of a drunken driving ban of car based on single chip system. The system in the alcohol concentrations exceed the standard environment can automatically control the motor start-up prohibited, as in reducing drunk driving traffic accidents caused by the offers of help. At the same time, the system also has a sound and light alarm, LCD display function. And the system can be used in different monitoring environment, according to different environmental settings of different thresholds, exceeds a threshold that sound and light alarm, and automatically banned and start the car. The design scheme has the advantages of simple hardware circuit design, software function is the use of C language programming, convenient and flexible. Design and use of alcohol sensor has high sensitivity, good working performance, low power consumption, low cost and other advantages. The system not only can be used in traffic detection, may also use in the winery and food plant fermentation monitoring etc. Key words: A drunken driving ban; STC89C52 single-chip microcomputer; Alcohol sensors; Threshold value 目 录 第1章 概述 1 1.1 选题的依据和课题的意义 1 1.2 选题的目的 1 1.3 国内外研究概况 2 1.4 课题研究方法 3 1.5 设计构成及研究内容 3 第2章 系统的工作原理与结构 4 2.1 系统的工作原理 4 2.2 系统的结构框图 4 2.3 系统的整体结构特点 5 2.4 系统的设计内容 6 2.5 本章小结 6 第3章 汽车醉酒禁驾系统的硬件设计 7 3.