目录1 绪论.............................................................................................................................32 总体技术方案.............................................................................................................42.1 技术方案比较......................................................................................................42.2 总体技术方案......................................................................................................63 硬件系统设计.............................................................................................................63.1 硬件总体原理框图..............................................................................................63.2 关键元件介绍......................................................................................................73.3 电源电路设计......................................................................................................73.3.1 单片机最小系统电路...................................................................................73.3.2 超声波测距电路...........................................................................................93.3.3 声光报警提示电路.....................................................................................103.3.4 环境光强度采集电路.................................................................................113.3.5 供电电路.....................................................................................................113.4 总体电路原理图................................................................................................124 软件系统设计...........................................................................................................134.1 软件设计思想....................................................................................................134.2 程序流程框图..................................................................................
