基于单片机的交通灯设计大学毕业论文英文文献翻译及原文Word文档格式.docx

基于单片机的交通灯设计大学毕业论文英文文献翻译及原文Word文档格式.docx

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毕业设计（论文）

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基于单片机的交通灯设计

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2017.02.14

单片机交通灯

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原文

题目：

DESIGNOFTRAFFICLIGHTBASEDONMCU

Becauseoftherapiddevelopmentofoureconomyresultinginthecarnumberoflargeandmedium-sizedcitiessurgedandtheurbantraffic,isfacingserioustest,leadingtothetrafficproblemincreasinglyserious,itsbasicallyarebehavedasfollows:

trafficaccidentfrequency,tothehumanlifesafetyenormousthreat,Trafficcongestion,resultinginserioustraveltimeincreases,energyconsumptionincrease;

Airpollutionandnoisepollutiondegreeofdeepening,etc.Dailytrafficjamsbecomepeoplecommonplaceandhadtoendure.Inthiscontext,incombinationwiththeactualsituationofurbanroadtraffic,developtrulysuitableforourowncharacteristicsofintelligentsignalcontrolsystemhasbecomethemaintask.

Preface

Inpracticalapplicationathomeandabroad,accordingtotheactualtrafficsignalcontrolapplicationinspection,planarindependentintersectionsignalcontrolbasicusingsetcycle,muchtimesetcycle,halfinduction,wholesensoretcinseveralways.Theformertwocontrolmodeiscompletelybasedonplanarintersectionalwaystrafficflowdataofstatisticalinvestigation,duetotrafficflowtheexistenceofvariablesexandrandomicity,thetwomethodshavetrafficefficiencyislow,thescheme,thedefectsofagingandhalfinductiveandalltheinductivethetwomethodsareintheformertwowaysbasedonincreasedvehicledetectorandaccordingtotheinformationprovidedtoadjustcycleislongandgreenletterofvehicle,itthanrandomarrivedadaptabilitybigger,canmakevehiclesintheparkingcordbeforeasfewparking,achievetrafficflowingeffect

Inmodernindustrialproduction,current,voltage,temperature,pressure,andflowrate,velocity,andswitchquantityarecommonmainlycontrolledparameter.Forexample:

inmetallurgicalindustry,chemicalproduction,powerengineering,thepapermakingindustry,machineryandfoodprocessingandsoonmanydomains,peopleneedtotransporttheorderlycontrol.Bysinglechipmicrocomputertocontroloftraffic,notonlyhastheconvenientcontrol,configurationsimpleandflexiblewaitforanadvantage,butalsocangreatlyimprovethetechnicalindexbycontrolquantity,thusgreatlyimproveproductqualityandquantity.Therefore,themonolithicintegratedcircuittothetrafficlightcontrolproblemisanindustrialproductionweoftenencounterproblems.

Inthecourseofindustrialproduction,therearemanyindustrieshavelotsoftrafficequipment,inthecurrentsystem,mostofthetrafficcontrolsignalisaccomplishedbyrelays,butrelaysresponsetimeislong,sensitivitylow,long-termafteruse,faultopportunityincreasesgreatly,andadoptssingle-chipmicrocomputercontrol,theaccuracyoffargreaterthanrelays,shortresponsetime,softwarereliability,notbecauseworkingtimereduceditsperformancesake,comparedwith,thissolutionhasthehighfeasibility.

AboutAT89C51

1.functioncharacteristicsdescription:

AT89C51isalowpowerconsumption,highperformanceCMOS8bitmicro-controller,hasthe8KinsystemprogrammableFlashmemory.Usehigh-densityAtmelcompanythebeltpasswordnonvolatilestoragetechnologyandmanufacturing,andindustrial80S51productinstructionsandpinfullycompatible.ChipFlashallowprogrammemoryinsystemprogrammable,alsosuitableforconventionalprogrammer.Inasinglechip,havedexterous8bitsCPUandinsystemprogrammableFlash,makeAT89C51formanyembeddedcontrolapplicationsystemprovidesthehighflexible,superefficientsolution.AT89C51hasthefollowingstandardfunction:

8kbytesFlash,256bytesRAM,32-bitI/Omouthline,thewatchdogtimer,twodatapointer,three16timer/counter,a6vectorlevel2interruptstructure,full-duplexserialport,pieceinsidecrystalstimelyclockcircuit.Inaddition,AT89C51candropto0Hzstaticlogicoperation,supporttwosoftwarecanchoosepowersavingmode.Idlemode,theCPUtostopworking,allowingtheRAM,timer/counter,serialports,interruptioncontinuetowork.Powerlostprotectionmode,RAMcontentbeingsaved,hasbeenfrozen,microcontrollerallworkstop,untilthenextinterruptionorhardwareresetsofar.Asshowninfigure1fortheAT89C51pinsallotment.

Figure1theAT89C51pinsallotment

2.interruptintroduction

AT89C51hassixinterruptsources:

twoexternalinterruption,（and）,threetimerinterrupt（timer0,1,2）andaserialinterrupts.EachinterruptsourcecanbepassedbuybitsorremoveIEtherelevantspecialregisterinterruptallowcontrolbitrespectivelymakeeffectiveorinvalidinterruptsource.IEalsoincludesaninterruptallowtotalcontrolbitEA,itcanbeabanallinte