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1、毕业课程设计题目：超声波测距摘要现今超声波测距已被应用在现实生活的各个领域。它与传统的测距方法相比精确度更高、操作更方便、安全系数更高。超声波测距是一种利用声波特性和电子计数相结合来实现距离测量的方法。本次课程设计主要介绍以AT89C51为核心的超声波测距系统。测距系统主要由超声波发射电路、超声波接收检测电路和显示电路组成。设计利用51单片机系统的I/O口，发出40MHZ的超声波，反射回来的超声波信号，经过放大和整形电路进入单片机，比较调试后确定其对应的距离，完成测距。可实现距离在3m内，盲区7cm的有效测距，测量精度为1cm,测量时与被测物体无直接接触，能够在LED上稳定的显示
2、测量结果。该测距系统测量精度高，使用方便，可应用于汽车倒车雷达、建筑施工工地以及一些工业现场的位置监控，也可用于如液位、井深、管道长度的测量等。Nowadaysultrasonicranginghasbeenusedinreallifeinallareas.Itcomparedwithtraditionalrangingaccuracyishigher,operationmethodsmoreconvenientandsafetycoefficient.Ultrasonicrangingisauseofacousticpropertiesandelectroniccounting
3、combinationtoachievedistancemeasurementmethod.ThiscoursemainlyintroducesthedesignUSESAT89C51asthecoreofultrasonicrangingsystem.Distancemeasuringsystemmainlybyultrasoniclaunchingcircuit,ultrasonicreceivingdetectioncircuitanddisplaycircuitcomposed.Using51SCMsystemdesignofI/Omouth,issued40MHZult
4、rasonic,reflectedultrasonicsignals,amplifiedandplasticcircuitintomicrocontroller,comparativeaftertestingtodetermineitscorrespondingdistance,completerange.Canrealizedistancefor3m,blindareawithintheeffectiverange-finding7cm,measurementaccuracyformeasuring1cm,withnodirectcontactwiththeobjecttobe
5、tested,canbeinLEDdisplayonthestabilityofthemeasurementresult.Themeasurementsystemofhi-ghaccuracy,easytouse,canbeappliedinautomobileback-draftradar,construc-tionsiteandsomeindustrialfieldlocationmonitoring,alsocanusedforsuchasliquidlevel,welldepth,thetubelengthmeasurement,etc.目录1绪论............
6、................................................................................................32总体设计方案.............................................................................................................32.1超声波测距原理.....................................................................
7、....................................2.2原理框图....................................................................................................................3系统硬件结构设计..........................................................................
