本科论文目 录摘 要...........................................................................................................IAbstract......................................................................................................II1 引 言.......................................................................................................12 天然气泄露检测报警系统的方案设计.................................................42.1 方案选择......................................................................................42.2 天然气泄露报警系统的整体设计方案......................................52.2.1 天然气泄漏报警器工作原理...........................................52.2.2 天然气泄漏报警器的结构...............................................53 天然气泄露报警的硬件部分设计.........................................................73.1 STC89C52 单片机.......................................................................73.2 传感器的选择............................................................................103.3 LCD1602 液晶显示电路...........................................................113.4 键盘电路....................................................................................123.5 A/D 转换电路.............................................................................133.6 报警电路....................................................................................153.6.1 灯光提示电路.................................................................153.6.2 声音报警电路.................................................................153.7 电源电路设计............................................................................173.8 继电器电路................................................................................174 天燃气泄漏检测报警系统的软件部分...............................................194.1 软件介绍....................................................................................194.2 主程序框图.............
