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TheControlSystemforLightingBasedonSingle–chipMicrocomputerWiththerapiddevelopmentofelectronictechnology,thesystemofcontrolbasedonSinglechipMicrocomputeriswidelyappliedinindustry,agriculture,electricpower,electron,intelligentbuildingandsoon.Microcomputer,asthesubjectandcoreoftheembeddedsystemofcontrol,replacesthetraditionalsystemelectroniccircuit.Atthesametime,thedevelopmentandmaturationoftheintelligentbuildinghaveestablishedthesubstantialfoundationforthepopularizationandapplicationofthecontrolsystemforlightingbasedonsinglechipmicrocomputer.Thepaperexpatiatesonthedesigningtheoriesandimplementationmethodofthecontrolsystemforlightingbywiredorwirelesscommunications.Takingthedesigningprocessasmainline,itdescribestheprocessofdesigningfromtworespectshardwareandsoftware.Inanotherword,thepaperdescribestheprocessfromthemethodofcircuitdesigningtothesoftwaretechnologyofrealizingthedemandedfunctions.ThehostcontrollerofthecontrolsystemforlightingisbasedonAT89C51singlechipmicrocomputer,andtheauxiliaryonesarebasedonAT89C2051.Thesystemcandomanyjobs,suchaswiredcommunication,wirelessdatatransmitting,controllinganddisplay.Thepaperdescribesthedesigningprocessofthecircuitatlength,includingkeyboardandLEDdisplaycircuit,RS485communicationcircuit,wirelesstransmittingcircuit,controlcircuitoflighting,watchdogcircuit,etc.Thedesigningofsoftwaremainlyincludestheseveralprogramming,suchaswiredcommunication,wirelessdatatransmitting,lamplightcontrolling,timedcontrolling,keyboardscanningandLEDdisplaying.ThewiredcommunicationprogrammingfunctionisthatthroughMasterslavecommunicationmethodbasedonRS485thehostcontrollersendsorderstotheallauxiliarycontrollersoreachone,includingturningonlighting,turningofflighting,regulatingbrightnessoflighting,controllingtimedlighting,etc.Thewirelessdatatransmittingprogrammingfunctionisthatbywirelesstransmitteritrealizeswirelesscontrollingofthelighting,andachievesthefunctionsidenticaltowiredcommunication.Traditionalbuildingautomaticcontrollingsystemonlyincludessuchsubsystemscomprehensivewires,computernetwork,safedefending,firedefendingandclosedcircuitsTVmonitoringsystemsandsoon.Butintherecentyears,withtheeconomicdevelopmentandtheprogressofthescienceandtechnology,peoplehaveputforwardmorehigherdemandsforenergyconservationoflightinglampsandscientificmanagement,whichmakesthelightingcontrolsystemoftheclassroomhavesuchfunctionsasenergyconservation,convenience,intelligence,etc.Whatsmore,itcanimprovetheefficiencyoftheworkandstudy,resultinmanykindsoflightingeffects,andimprovethemanagementlevel.Therearethedesignphilosophyofthissystem,operationprincipleofeverychip,andsuchrelevantproblemsasthechoice,makinganddebuggingofthecomponentsandunitcircuitsaboutlightingcontrolsystemofclassroom,whichregardsthemicrocontrolunitasthecontrolcoreofthesystem.Thiscontrolsystemissuitableforsuchoccasionsasvariouskindsofmultimediaclassrooms,stationwaitingrooms,offices,etc.Itismainlycomposedoflighteningcontrolunit,movingsensorunit,illuminativesensorunit,handedcontrolunit,andsoon.Thetargetofthedesignisintelligentlightening,scientificmanagement,andenergyconservationandcostconservation.TheAT89C2051withthefeatureofcheapcosthasbeenusedasthecontrolunitinthewholedesign.Thewholesystemnotonlyhasbeenintroducedinthepaper,butalsohasbeensuccessfullyfinishedwithseriesoftheDaismicrocontrolunit.Theexperimentsuggeststhatthisdesigncaneasilycometrueiftheusersdoasthethesis.Soitcanbeusedastheintelligentlightingcontrolsystemoftheuniversitycampus.Whatsmore,itwillaffectbetterifcombiningwithotherintelligentcontrolsystems.LEDSummaryLEDLightEmittingDiode,lightemittingdiode,isasolidstatesemiconductordevices,whichcanbedirectlyconvertedintoelectricitytolight.LEDistheheartofasemiconductorchip,thechipisattachedtooneendofastent,isthenegativeside,theotherendofthepowerofthecathode,theentirechippackagetobeepoxyresin.Semiconductorchipiscomposedoftwoparts,partofthePtypesemiconductor,itinsidetheholedominated,theothersideistheNtypesemiconductor,hereismainlyelectronic.Butlinkingthetwosemiconductors,amongthemtheformationofaPNjunction.Whenthecurrentthroughthewiresroleinthischip,willbepushingeP,Pzoneintheholewithelectroniccomposite,andthentobeissuedintheformofphotonenergy,andthisistheprincipleofLEDluminescence.Thewavelengthoflightthatisthecoloroflight,isformedbythePNjunctionofthedecisionsofthematerial.LEDhistory50yearsago,peoplehavetounderstandsemiconductormaterialscanproducelightofthebasicknowledge,thefirstcommercialdiodesin1960.EnglishistheLEDlightemittingdiodeLEDacronym,anditsbasicstructureisanelectroluminescentsemiconductormaterials,placedinawirerack,thensealedwithepoxyresinaround,thatis,solidpackage,Therefore,theprotectionoftheinternalbatteriescanplaytheroleofline,sotheseismicperformanceLEDgood.LEDisthecoreofthePtypesemiconductorandcomponentsoftheNtypesemiconductorchips,thePtypesemiconductorandNtypesemiconductorbetweenatransitionlayer,calledthePNjunction.InsomesemiconductormaterialsinthePNjunction,theinjectionofasmallnumberofcarriercarrierandthemajorityoftheextratimewillbeintheformoflightenergytorelease,thusthepowertodirectconversionofsolarenergy.PNjunctiononreversevoltage,afewhardcarrierinjection,itisnotluminous.Thisuseofinjectionelectroluminescentdiodesisproducedbytheprincipleoflightemittingdiodes,commonlyknownasLED.Whenitinapositivestateoftheworkthatis,atbothendswithforwardvoltage,thecurrentflowsfromtheLEDanode,cathode,semiconductorcrystalsontheissuefromtheultraviolettoinfraredlightofdifferentcolors,lightandthestrengthofthecurrents.InstrumentsusedforthefirstLEDlightsourceinstructions,butallkindsoflightcoloredLEDlightsintrafficandlargescreenhasbeenwidelyapplied,haveaverygoodeconomicandsocialbenefits.The12inchredtrafficlightsasanexample,isusedintheUnitedStateshavelonglife,lowefficiency140wattincandescentlampasalightsource,itproduced2,000lumensofwhitelight.Theredfilter,theloss90percent,only200lumensofredlight.Inthelightofthenewdesign,Lumiledscompanieshave18redLEDlightsource,includingthelossofcircuit,atotalpowerconsumptionof14wattstogeneratethesameopticaleffect.AutomotiveLEDlightsisalsothesourceofimportantareas.Forgenerallighting,peopleneedmorewhitelightsources.The1998whiteLEDsuccessfuldevelopment.ThisistheGaNLEDchipandYttriumAluminumGarnetYAGpackagetogethercause.GaNchipoftheBlurayλp465nm,Wd30nm,madeofhightemperaturesinteringoftheCe3YAGphosphorsexcitedbythisBlurayafterirradiatingayellow,thepeak550nm.BluechipinstalledintheLEDbasedWanxingreflectioninthecavity,coveredwitharesinmixedwithYAGthinlayer,about200500nm.LEDbasedtabletsissuedbytheBlurayabsorptionpartofthephosphor,thephosphoranotherpartoftheBlurayandayellowlightmixed,canbeawhite.Now,theInGaN/YAGwhiteLED,YAGphosphorbychangingthechemicalcompositionofthephosphorlayerandadjustthethicknessofthe350010000Kcolortemperaturecanbecoloredwhite.ThisblueLEDthroughthemethodbywhite,constructedsimple,lowcost,hightechnologyismature,sousethemost.Inthe1960s,theuseofscienceandtechnologyworkerssemiconductorPNjunctionofTheprincipleofdevelopingaLEDlightemittingdiodes.Atthattime,thedevelopmentofLED,thematerialsusedareGaASP,itsluminouscolorisred.Afternearly30yearsofdevelopment,andnowweareveryfamiliarwiththeLED,hasbeensenttored,orange,yellow,green,blue,andothershade.HoweverlightingnecessaryforwhiteLEDlightonlyinrecentyearstodevelop,readersheretotellusaboutlightingwithwhiteLED.
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