摘要车从被发明的那天起就代表了无限的荣耀。随着时代的发展，越来越多的汽车进入了人们的生活和家庭。同时，汽车也带来了很多的麻烦与不足，好比车祸，以及对空气的污染。在种种的车祸因素中，醉驾是个最大的要素。这个问题的解决政策在我国已经多种多样。可是，我们更希望能够再减少点事故发生的概率，通过我们的努力。76875

这个设计的出发点就是从源头上阻止车祸的发生，从而使得醉驾导致的车祸概率大大降低。我的设计思路是利用MQ3气敏传感器的检测效果，中枢控制由单片机完成，通过LCD的数值显示监测，对规定浓度以上的空气酒精的含量报警，与此同时使得点火电路中断。该设计意图运用于汽车的实际驾驶中，方便安装与运用，适合于大规模的推广

毕业论文关键词：单片机STC89C52  传感器MQ3 

Car alcohol concentration test controller

Abstract The car was invented by the day on behalf of infinite glory。 With the development of the times, more and more cars on the lives of people and families。 Meanwhile, the car also brings many problems with shortages, such as a car accident, as well as air pollution。 Various factors in the accident, drunk driving is the biggest factor。 Policy to solve this problem in our country has changed。 However, we hope to reduce the possibility of the accident point, with our efforts。

The starting point of this design is to prevent the occurrence of accidents at the source, so that the probability of a car accident caused by drunk driving is greatly reduced。 My design idea is to use gas sensors MQ3 to discover the effect of central control of the microcontroller, LCD monitor screen of the value of the content of air over a concentration predetermined alarm alcohol, at the same time so that the circuit ignition is discontinued。 The design used in the actual goal driving the car, making it easy to install and use, suitable for large-scale promotion

Keywords:  singlechip-STC89C52  sensor-MQ3

目  录

摘要。Ⅰ

AbstractⅡ

目录。Ⅲ

1   绪论 1

 1。1设计背景 1

     1。2设计目标 1

     1。3 设计主要工作 1

    2   方案设计 3

     2。1 系统原理 3

     2。2 系统流程图 4

    3   硬件设计 4

     3。1 最小系统电路 5

     3。2 显示模块 7

     3。3 传感模块 7

     3。4 模数转换模块 9

     3。5报警与控制电路 10

4   软件设计 14

     4。1 总流程 14

     4。2 信号转换 15

     4。3 限值设定 16

     4。4 酒精浓度算法 16

5   安装与调试 17

     5。1 软件安装与调试