摘要本设计设计一个烟感报警器，通过传感器(包括温感和烟感)将现场温度、烟雾等信号转化为可检测的电信号，放大和滤波电路将传感器输出的电信号送入A/D转换电路,完成烟雾传感器和温度传感器输出的模拟信号到数字信号的转换，单片机判断现场是否发生火灾。若发生火灾，系统会驱动蜂鸣器和指示灯报警。由于系统采用高性能的单片机芯片为核心和高灵敏度的烟感传感器，而且利用声音和指示灯两种报警形式进行报警提示，大大的提好了系统的精确性和可靠性。关键词单片机AT89C51ADC0809传感器SummaryThedesignofthedesignofasmokealarm,thescenetemperature,smoke,etc.signalintoelectricalsignaldetectedbythesensors(includingtemperaturesensitiveandsmoke),amplificationandfilteringcircuitofthesensoroutputelectricalsignalfedtotheA/Dconvertercircuit,thecompletionofthesmokesensorandtemperaturesensoroutputanalogsignaltodigitalsignalconversion,themicrocontrollertodeterminewhetherthesitefire.Ifafireoccurs,thesystemwilldrivethebuzzerandthealarmindicator.Asthesystemuseshigh-performancemicrocontrollerchipasthecoreandhighsensitivitysmokesensors,andtheuseofsoundandlightformoftwoalarmalarm,muchofthegoodaccuracyandreliabilityofthesystem.KeywordsAT89C51MCU;ADC0809sensor目录TOC\o"1-3"\h\z\uHYPERLINK\l"_Toc355600623"1引言PAGEREF_Toc355600623\h3HYPERLINK\l"_Toc355600624"1.1课题研究的背景和意义PAGEREF_Toc355600624\h3HYPERLINK\l"_Toc355600625"1.2本文内容的结构安排PAGEREF_Toc355600625\h3HYPERLINK\l"_Toc355600626"2火灾报警系统整体方案设计PAGEREF_Toc355600626\h4HYPERLINK\l"_Toc355600627"2.1火灾的烟雾产生过程和温度升高过程PAGEREF_Toc355600627\h4HYPERLINK\l"_Toc355600628"2.2.1系统硬件总体构架PAGEREF_Toc355600628\h5HYPERLINK\l"_Toc355600629"2.2.2系统软件总体构架PAGEREF_Toc355600629\h6HYPERLINK\l"_Toc355600630"2.3系统主要器件的选择PAGEREF_Toc355600630\h6HYPERLINK\l"_Toc355600631"2.3.1传感器的选择PAGEREF_Toc355600631\h6HYPERLINK\l"_Toc355600632"2.3.2单片机芯片的选择PAGEREF_Toc355600632\h11HYPERLINK\l"_Toc355600633"2.3.3A/D转换芯片的选择PAGEREF_Toc355600633\h12HYPERLINK\l"_Toc355600634"3火灾自动报警系统硬件设计PAGEREF_Toc355600634\h13HYPERLINK\l"_Toc355600635"3.1信号放大和滤波电路PAGEREF_Toc355600635\h13HYPERLINK\l"_Toc355600636"3.2晶振电路与复位电路PAGEREF_Toc355600636\h15HYPERLINK\l"_Toc355600637"3.2.1晶振电路PAGEREF_Toc355600637\h15HYPERLINK\