基于单片机的酒精浓度测试仪设计.doc

题 目： 此外，因为交通事故造成的经济损失也相当惊人。据事故调查统计，大约50%—60%的车祸与饮酒有关。中国公安部门在2009年8月，在全国各地加强查处酒后驾驶的力度，以减少由酒后驾驶造成的恶性交通事故。要查处就涉及到检测人体内的酒精含量和使用设备来进行检测的问题。 本文研究设计了一种用于公共场所具有检测及超限报警功能的酒精浓度智能测试仪。其设计方案基于89C51单片机，MQ3酒精浓度传感器。系统将传感器输出的4~20mA的标准信号通过以AD0832为核心的A/D转换电路调理后，经由单片机进行数据处理，最后由LCD显示酒精浓度值。文中详细介绍了数据采集子系统、数据处理过程以及数据显示子系统和报警电路的设计方法和过程。系统对于采样地点超出规定的酒精浓度时二极管报警电路提醒监测人员。同时，操作人员对于具体报警点的上限值可以通过单片机编程进行设置。 关键词：酒精浓度传感器（MQ3）；MCU；A/D转换器；软件设计；硬件设计  Abstract Since 2000, with Chinas rapid economic development and the rapid increase peoples living standard, China has gradually stepped into car society, drink driving accident caused by more and more impact on society is also growing, Alcohol is becoming more and more brutal killers. According to statistics, the worldwide number of people killed in road accidents every year on more than 60 million people, left with permanent disability of 400 million or more, usually the injured were numerous. In many countries, traffic accidents have become the first cause of accidental deaths. In addition, the economic losses caused by the accident is quite amazing. Accident investigation, according to statistics, about 50% -60% of car accidents and alcohol-related. China’s Ministry of Public Security in August 2009, around the country to strengthen efforts to investigate and deal with drink driving, to reduce the drink driving accident caused by the vicious. To investigate the human body involving the detection of alcohol and use of equipment to detect problems. In this paper, design a public place for the detection and limit alarm functions with an alcohol concentration of intelligent tester. This design,based on STC89C51 microcontroller and MQ3 alcohol concentration sensor. System sensor output 4 ~ 20mA standard signal through AD0832 core A / D converter circuit, after conditioning, data processing by the MCU, the final alcohol concentration value from the LCD display. This paper describes the data acquisition subsystem, data processing and data display subs