单片机的汽车汽车火灾报警系统模拟设计与实现论文.doc

毕业设计论文 题 目： 学校： 姓名： 老师： 联系方式： 2015月1日25日 摘 要 随着现代汽车用量的增加，汽车汽车火灾发生的频率越来越高，汽车火灾报警器也随之被广泛的应用于各种场合。本设计是利用单片机结合传感器技术而开发设计的智能汽车火灾报警系统。设计目的是设计和实现一种分布式智能汽车火灾报警控制系统，实现系统软硬件的组成和实现。论文中主要针对智能汽车火灾报警器系统中的各个组成部件进行了介绍，对它的主控电路和外围设备电路之间的接口技术，还有软件方面进行了重点介绍。 设计以MCS-51单片机为硬件核心实现智能汽车火灾报警系统的设计。文中选用MQ-2型半导体汽车火灾传感器实现汽车火灾的检测；选用DS18B20数字温度传感器实现温度的检测；使用ADC0809对MQ-2采集的模拟信号进行A/D转换，以便单片机处理。由于ADC0809的时钟信号通常为500KHz，故而选用74LS74进行分频。单片机处理数据后，与设定的上限值进行比较，超过上限值时，发出指令，实现光报警，达到预期的效果。 关键词：汽车火灾；单片机；报警器；传感器Abstract With the modern family the use of fire, electricity consumption increases, households are more frequent fires, fire alarm also will be widely used in various applications. This design is the use of microcomputer with the sensor technology development and design of intelligent fire alarm system. Design purpose is to design and implementation of a distributed intelligent fire alarm control system, and the composition and realization of hardware and software. The main thesis of intelligent fire alarm system of the component parts have been introduced, its main control circuit and peripheral circuits interface between technology and software were also highlighted. Designed to MCS-51 microcontroller core for the hardware realization of intelligent fire alarm system. A selection MQ-2-type semiconductor Smoke Sensors detect smoke; optional digital temperature sensor DS18B20 Temperature measurement; use of the MQ-2 ADC0809 analog signals acquisition A / D converter for single chip processing. As the ADC0809 clock signal is usually 500KHz, Guer 74LS74 for frequency selection. MCU processing data, and set the upper limit comparison, over the limit, give directions, to achieve sound and light alarm, to achieve the desired results. Key words：F