目 录
摘 要 ............................................................................................................................I
ABSTRACT .................................................................................................................II
目 录..........................................................................................................................III
第一章 概 述............................................................................................................1
1.1 课题研究的背景和意义 .................................................................................1
1.2 报警器发展现状 ..............................................................................................1
1.3 火灾报警系统的类型 ......................................................................................2
1.4 主要设计指标及参数 ......................................................................................3
第二章 报警器核心芯片的选择................................................................................4
2.1 课题设计方案 ..................................................................................................4
2.2 烟雾传感器的选择 .........................................................................................5
2.2.1 烟雾传感器的分类 ...............................................................................5
2.2.2 烟雾传感器检测烟雾种类 ...................................................................6
2.2.3 烟雾传感器的选择 ...............................................................................6
2.3 单片机的选择 .................................................................................................7
第三章 报警器硬件电路的设计................................................................................8
3.1 火灾报警器信号采集电路 .............................................................................9
3.1.1 MQ-2 型烟雾传感器..............................................................................9
3.1.2 前置放大电路 .....................................................................................10
3.2 AT89S52 单片机介绍....................................................................................11
3.2.1 AT89S52 单片机..................................................................................11
3.2.2 AT89S52 单片机引脚介绍..................................................................12
3.3 单片机晶振电路与复位电路 .......................................................................14
3.3.1 单片机晶振电路 .................................................................................14
3.3.2 单片机复位电路 .................................................................................14
3.4 A/D 转换电路 ................................................................................................15
3.4.1 ADC0809 芯片.....................................................................................15
