车载酒精浓度监控设备设计.doc

车载酒精浓度监控设备设计 关键词：STG89C52; ADC0804 ; 酒精传感器MQ-3； 继电器Car alcohol monitoring device design Abstract The increase based on vehicle Population brings the increase of car incidents years by years.Among the reasons which cause the incident,drunk drive absolutely bears the brunt of any danger. By now, to decrease the Phenomena of drunk drive,the only way 15 using alcohol examiner to determine whether the driver drunk or not in the field by traffic police. Because the examiner device 15 not assembled in the car, so policeman has to hold the device to effect on by one.By using this kind of method, traffic jams occurs quite often because of efficiency. So to be the drunk drive for bidden is hard to achieve. Between the increasing emphasis on drunk driving, alcohol test subject will be more peoples minds. Traffic accidents caused by drunk driving is the driver drinking excessive amounts of alcoholic paralysis of nerves, the brain is unresponsive, physically out of control symptoms. Therefore, this research project is a gas sensor and microcontroller-based, monitoring air alcohol concentration, the LCD display the functions of the air alcohol concentration measurement and control instrument. It monitors the air and breath alcohol concentration exceeds a set value alarm, and displays the value, to prompt dangerous. Car alcohol monitoring and control of the design can achieve the following objectives: (1) in favor of social and public transportation security; (2) effectively reduce the incidence of traffic accidents; (3) alcohol monitoring and control has become more convenient, safe, accurate and efficient, to facilitate the popularization of home alcohol monitoring and control. Keyword: Microcontroller; the ADC0804; MQ-3 Alcohol Sensor; relay目录 第一章 绪论 1 1.1 设计背景 1 1.2 气敏传感器的研究现状 2 1.3 设计酒精浓度测试控制电路的意义 3 第二章 硬件电路设计与实现 4 2.1 系统框图 4 2.2 单片机模块 5 2.3 模数转换器模块 6 2.4 酒精传感器模块 8 2.5 液晶显示模块 11 第三章 系统的硬件设计 13 3.1 最小系统电路 13 3.2 蜂鸣器报警原理及其电路 15 3.3 继电器驱动原理