目录摘要.........................................................1Abstract.....................................................2第一章绪论...................................................31.1研究背景................................................31.2国内外研究现状..........................................31.3本文内容介绍............................................4第二章超声波测距原理.........................................52.1超声波..................................................52.1.1超声波简述...........................................52.1.2超声波的两个主要参数.................................52.1.3温度对超声波的影响...................................52.2超声波测距原理..........................................62.2.1超声波测距方法.......................................62.2.2超声波测距实现.......................................7第三章硬件设计...............................................83.1硬件设计总览............................................83.2STC89C52RC芯片介绍.....................................83.3超声波模块..............................................93.4时钟模块...............................................103.5语音模块...............................................113.6LCD1602模块（用于测试调试以及时间设置）...............12第四章软件设计..............................................144.1软件设计思路...........................................144.2软件设计程序框图.......................................144.2.1主程序设计流程图....................................144.2.2设置时间程序流程图..................................154.2.3中断程序流程图......................................17第五章系统测试与结果分析....................................185.1设计目标...............................................185.2系统测试...............................................185.3结果分析...............................................20第六章总结与展望...........................................216.1设计总结...............................................216.2展望...................................................21参考文献....................................................23致谢........................................................24摘要本文介绍的是一款基于STC89C52RC单片机芯片的超声波导盲系统。该系统利用HC-SR04超声波模块，通过单片机的控制收发超声波，实现对障碍物进行检测，然后利用收发时间差以及超声波在空气中的传播速度，完成对距离的计算，最后通过单片机的一系列处理，将结果反馈给盲人用户。本文将从该系统设计的理论基础超声波测距原理开始，详细地阐述超声波测距理论基础、HC-SR04超声波模块的使用、DS1302时钟模块的使用、YF017语音模块的使用。本文还通过利用DS1302时钟模块及YF017语音模块配合单片机的I/O口，为导盲系统添加了诸如按键语音日历、语音报时及语音报距等对于盲人比较友好的功能。关键词：单片机；超声波测距；导盲仪；DS1302；YF017；HC-SR04；STC89C52RCAbstractThisarticledescribesanultrasonicblindingsystembasedontheSTC89C52RCmicrocontrollerchip.ThesystemusestheHC-SR04ultrasonicmoduletosendandreceiveultrasonicwavesthroughthecontrolofasingle-chipmicrocomputertodetectobstacles,andthenusesthetimedifferencebetweensendingandreceivingandthepropagationspeedofultrasonicwavesintheairtocompletethecalculationofthedistance.Finally,itisprocessedbyaseriesofsingle-chipmicrocomputers.Feedbackresultstoblindusers.Thisarticlewillbeginwiththetheoreticalbasisofthedesignoftheultrasonicdistancemeasurementprinc...
