目录1任务与要求.........................................................31.1课题概述.....................................................31.2设计内容与要求..............................................31.2.1功能要求...............................................31.2.2设计内容...............................................31.3参数要求.....................................................32基于51单片机的超声波测距设计分析................................42.1设计背景.....................................................42.2需求分析一一设计要求.......................................42.2.1工艺要求..............................................42.2.2设计要求...................................................42.4产品设计实施计划............................................53方案设计与论证.....................................................63.1总体方案框架设计分析........................................63.2方案的选择与设计............................................63.2.1主控模块的选择与确定..................................63.2.2显示模块的选择与确定.................................63.2.3按键模块的选择与确定.................................73.2.4电源模块的选择与确定.................................73.2.5超声波模块的选择与确定...............................73.4方案确定（论证）............................................73.4成本预算表（表1）.............................................................................8表1成本预算表..............................................84.1单片机最小系统硬件设计.....................................94.1.1单STC89C52引脚图....................................94.2单片机最小系统原理图.......................................104.3HC-SR04超声波模块电路....................................104.3.1HC-SR04模块电气参数.................................114.3.2基本工作原理..........................................114.4语音播报....................................................124.5显示单元....................................................124.6主程序流程图...............................................134.7超声波发生子程序和超声波接收中断程序......................155样机试制..........................................................175.1元器件的选择与测量........................