毕业设计基于单片机的数字万用表设计毕业论文.doc

www.yanziedu.comwww.yanziedu.com毕业设计（论文）题目基于单片机的数字万用表设计英文题目THEDESIGNOFDIGITALMULTITESTERBASEDONMONOLITHICINTEGRATEDCIRCUIT学生姓名学号指导老师职称专业www.yanziedu.comwww.yanziedu.com摘要本次设计用单片机芯片AT89s52设计一个数字万用表，能够测量交、直流电压值、直流电流、直流电阻以及电容，四位数码显示。此系统由分流电阻、分压电阻、基准电阻、电容测试芯片电路、51单片机最小系统、显示部分、报警部分、AD转换和控制部分组成。为使系统更加稳定，使系统整体精度得以保障，本电路使用了AD0809数据转换芯片，单片机系统设计采用AT89S52单片机作为主控芯片，配以RC上电复位电路和11.0592MHZ震荡电路，显示芯片用TEC6122，驱动8位数码管显示。程序每执行周期耗时缩到最短，这样保证了系统的实时性。关键词数字万用表AT89S52单片机AD转换与控制www.yanziedu.comwww.yanziedu.comAbstractThisdesignisdesignadigitaluniversalmeterwithchipAT89s52ofonechipcomputer,canmeasureandhandin,directcurrentpressingvalue,directcurrentflow,thedirectcurrentishindered,fournumbersshow.Thissystemisshuntedresistance,resistanceofpartialpressure,basicresistance,minimumsystemof51onechipcomputers,shownthatsome,warningpart,ADchangeandcontrolmakinguppartly.Inordertomakethesystemmoresteady,makethewholeprecisionofthesystembeensured,thiscircuithasusedAD0809datatochangethechip,theonechipcomputersystemisdesignedtoadoptAT89S52onechipcomputerasthetopmanagementchip,theelectricityisrestoredtothethronethecircuitand11.0592MHZandshakenthecircuittomatchonRC,showthatthechipusesTEC6122,urge8numberstobeinchargeofshowing.Theeveryexecutioncycleconsumingtimeofprocedurecontractstogetshortest,inthiswaytherealtimecharacterofthesecuritysystem.KeywordDigitaluniversalmeterAT89S52onechipcomputerADchangesandcontrolswww.yanziedu.comwww.yanziedu.com目录摘要.................................................................iAbstract..............................................................ii绪论.................................................................41.数字万用表设计背景..................................................61.1数字万用表的设计目的和意义..............................................................................61.2数字万用表的设计依据.........................................................................................61.3数字万用表设计重点解决的问题..........................................................................62数字万用表总体设计方案...............................................62.1数字万用表的基本原理..........................................................................................62.2数字万用表的硬件系统设计总体框架图...........................................................122.3硬件电路设计方案及选用芯片介绍....................................................................132.3.1设计方案.....................................................................................................132.3.2芯片选择及功能简介.................................................................................142.4数字万用表的硬件设计........................................................................................242.4.1分模块详述系统各部分的实现方法..........................................................242.4.2数字万用表控制硬件整体结构图...........................................................292.4.3电路的工作过程描述.................................................................................293.系统软件与流程图...................................................303.1电路功能模块.......................................................................................................303.2系统总流程图........................................................................................................303.3物理量采集处理流程.............................................323.4电压测量过程流程图.............................................323.5电流的测量过程流程图...........................................343.6电阻的测量过程流程图...........................................353.7电容测量过程流程图...........................................................................................36结论................................................................37致谢................................................................38参考文献..............................................................39