目录第一章 系统总体方案选择和说明......................71.1 方案选择.................................................................................................71.2 系统说明.................................................................................................7第二章 系统结构框图和工作原理..........................82.1 设计框架图.............................................................................................82.2 工作原理.................................................................................................9第三章 各单元硬件设计说明及法计算方...................103.1 主控芯片 80C51....................................................................................103.2 A/D 转换集成电路主芯片 0809..........................................................123.3 集成气体传感器 TGS202 元件............................................................133.4 地址锁存器主芯片 74LS373...............................................................143.5 单片机时钟电路...................................................................................163.6 复位电路...............................................................................................173.7 光报警系统...........................................................................................183.8 单片机振荡电路...................................................................................19第四章 软件设计......................................204.1 软件总体设计.......................................................................................20第六章 总结...........................................23附件 1（原理图）.............................................................................25附录 2 参考文件........................................................................................31第一章 系统总体方案选择和说明1.1 方案选择用单片机控制一个检测报警系统，和以往用数字逻辑电路组成控制系统相比，用单片机组成检测报警系统，应含有更...
