PAGE\*ROMAN\*MERGEFORMATIV学号：常州大学毕业设计（论文）（2012届）题目学生学院专业班级校内指导教师专业技术职务校外指导老师专业技术职务二○一二年六月基于单片机的简易转速测量系统设计摘要：在工程实践中，经常会遇到各种需要测量转速的场合，测量转速的方法主要有模拟式和数字式两种。模拟式采用测速发电机为检测元件，得到的信号是模拟量。数字式通常采用光电编码器，霍尔元件等为检测元件，得到的信号是脉冲信号。随着微型计算机的广泛应用，特别是高性能价格比的单片机的出现，转速测量普遍采用以单片机为核心的数字式测量方法。该文设计了一个简易的直流电机转速测量系统，主要由霍尔传感器、单片机和显示器、键盘电路、报警电路等组成。系统以AT89S52单片机为控制核心，采用M测速法原理，用霍尔传感器进行转速测量，4位的LED显示转速，当转速高于上限或低于下限值都会进行报警，并通过键盘输入设置开关控制阈值。该系统具有电路简单，测量速度快，可靠高等特点。关键字：AT89S52单片机；转速；霍尔传感器DesignofsimplespeedmeasurementsystembasedonSCMAbstract：Inengineeringpractice,weencounteravarietyofoccasionsfrequently,whichneedtomeasurethespeed.Andthemethodsofmeasuringspeedaremainlyincludinganaloganddigital.Intheanalogmeans,thetachometergeneratorisusedasthedetectingcomponenttogetanalogsignal,whiletheopticalencoderortheHallelementtogetpulsesignalsinthedigitalmeans.Inthispaper,asimpleDCmotorspeedmeasurementsystemisdesigned,whichismainlymadeupoftheHallsensor,AT89S52SCM,displayer,keyboardcircuitandalarmcircuit.AT89S52SCMisthecoreofthemeasurementsystem.Using"M"velocimetryprinciple,weusetheHallsensortomeasurethespeed,4-bitLEDtoshowthespeedandkeyboardtosettheswitchtocontrolthreshold.Andthealarmfunctionisalsorealizedwhenspeedishigherthantheupperlimitorbelowthelowerlimit.Thedesignedsystemissimpleandhasthecharacteristicsoffastmeasuringandhighreliability.Keywords:AT89S52SCM;Speed;HallSensors目录TOC\o"1-3"\h\z\uHYPERLINK\l"_Toc327273541"摘要：PAGEREF_Toc327273541\hIHYPERLINK\l"_Toc327273542"目录PAGEREF_Toc327273542\hIIIHYPERLINK\l"_Toc327273543"1引言PAGEREF_Toc327273543\h1HYPERLINK\l"_Toc327273544"1.1课题的开发背景和意义PAGEREF_Toc327273544\h1HYPERLINK\l"_Toc327273545"1.2转速测量在国内外的研究PAGEREF_Toc327273545\h1HYPERLINK\l"_Toc327273546"1.3课题任务PAGEREF_Toc327273546\h2HYPERLINK\l"_Toc327273547"2转速测量系统的总体方案PAGEREF_Toc327273547\h3HYPERLINK\l"_Toc327273548"2.1转速测量的一般方法PAGEREF_Toc327273548\h3HYPERLINK\l"_Toc327273549"2.2硬件设计总体方案PAGEREF_T