本科论文目 录摘 要....................................................................................................................IAbstract.....................................................................................................................II引 言...................................................................................................................11 控制系统设计........................................................................................................31.1 系统方案设计.............................................................................................31.2 电路总体方案.............................................................................................32 硬件设计................................................................................................................42.1 超声波测距模块.........................................................................................42.1.1 HC-SR04 超声波测距原理.............................................................42.1.2 超声波传感器介绍..........................................................................42.1.3 HC-SR04 超声波测距模块的性能特点.........................................52.1.4 管脚简介..........................................................................................62.1.5 HC-SR04 的电气参数.....................................................................62.1.6 超声波时序图..................................................................................72.2 单片机最小系统.........................................................................................72.2.1 STC89C51........................................................................................82.2.2 复位电路..........................................................................................82.2.3 晶振电路..........................................................................................92.3 显示电路和报警电路...............
