摘 要现在，人类已经步入了信息时代，烟雾报警系统已经成为实现家庭设备安全管理的基础。当人们家中发生意外性火灾时，吸入火灾烟雾会导致呼吸道堵塞并引发呼吸衰竭，并且火灾还会造成经济财产损失，危害公共安全。本设计是基于 AT89S51 单片机的烟雾报警系统，主要由 MQ-2 敏感元件烟雾传感器、DS18B20 温度传感器、A/D 转换模块以及由蜂鸣器、LED 灯和液晶显示器组成的声光报警系统组成。由 MQ-2 敏感元件烟雾传感器和 DS18B20温度传感器采集外界的温度和气体浓度作为输入信息，经由 A/D 转换模块将模拟信号转换为数字信号并放大，由 AT89S51 单片机接受处理转换完的数字信号，对比其数值是否超过所设定的阈值并将浓度通过状态显示模块的 LCD屏显示出来，若达到阈值则启动声光报警系统，实现报警。本设计简单易操作，而且制造成本比较低廉，可靠性高，在人们日常生活中能够起到防火的作用，能最大程度的避免人员伤亡以及财产损失。- I -关键词：AT89S51 单片机；烟雾传感器；声光报警系统AbstractNow, the human has entered the information age, smoke alarm system has become the basis for the realization of home equipment safety management. When accidental fires occur in people's homes, inhalation of fire smoke can cause choking and respiratory failure, and fire can cause economic and property losses, endangering public safety. The design is based on AT89S51 SINGLE-CHIP SMOKE ALARM SYSTEM, mainly by MQ-2 sensor smoke sensor, DS18B20 temperature sensor, a / D conversion module and by the Buzzer, LED lights and liquid crystal display composed of sound and light alarm system. The smoke sensor MQ-2 and DS18B20 are used to collect the outside temperature and gas concentration as the input information. The analog signal is converted into digital signal and amplified by a / D conversion module, the AT89S51 single chip computer receives the converted digital signal, compares whether the value of the digital signal exceeds the set threshold and displays the concentration throug...
