完整版基于单片机的家用电器电话远程控制系统毕业论文.docx

完整版基于单片机的家用电器电话远程控制系统毕业论文.docx

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完整版基于单片机的家用电器电话远程控制系统毕业论文

基于单片机的家用电器电话远程控制系统

 现在才将早已过去的毕业设计的的论文放在这里，不是因为这篇论文有多么的了不起，只想把我曾经的一点关于大学最后奋斗的记忆留在这里，以示对那青春岁月的追逝，并以此为证；同时也为那些能够为了整好论文而不停"baidu"的后继者也借鉴，希望只做参考，切不可照搬，因为此文还有不完善的地方，寄望后人斧正。

基于单片机的家用电器电话远程控制系统

本文设计的是一种基于AT89C51单片机的远程电话控制系统。

该系统是以AT89C51为核心、利用现有的个人通信终端,实现基于PLMN（陆基移动通信网）和PSTN（公用电话交换网）的电话远程控制系统。

电话远程控制系统（ITRCS）,以CCITT（国际电报电话咨询委员会）及我国标准共同规定的部分标准程控交换信令（DTMF双音多频信号,振铃信号,回铃音信号等）作为系统控制命令,以PLMN与PSTN通信网作为传输介质,使用者可以在远端利用固定电话或移动电话发送DTMF双音多频信号,实现对近端电器设备的实时远程控制。

该电话远程控制系统不需进行专门的布线,不占用无线电频率资源,从而可避免电磁污染；且通过嵌入式的智能语音提示,突出的语音提示功能和密码控制系统,可使操作者根据各种提示音及时了解受控对象的有关信息。

还可通过发出语音命令用电话远程控制多个受控对象,用户可以查询其状态,提供密码处理功能,只有输入正确的密码才能控制家电,从而提高了安全性。

该系统设计实用，功能灵活多样，可靠性高，操作方便，可以广泛地应用于家庭或者其它场所的智能控制。

关键词　AT89C51；远程电话控制；DTMF；智能家电

TheTelephoneRemoteControlSystemforHouseholdElectronicApplianceBaseonTheMicrocontroller

Abstract

ThearticledesignedtheremotetelephonecontrolsystemwhichbasedonmicrocontrollerAT89C51.BasingonthePLMNandPSTN,thesystemwhichusesthecorecontrollerSingle-chipmicrocomputerAT89C51realizeslong-distancecontrolreceivesDTMFcodefromthetelephonenet,andinterpretthecode,thecorecontrollercontrolsthestateof.Longdistancecontroloftelephonedoesnotrequirespecialwiresdistributionanddoesnottakeupwirelessfrequencyresources.Electromagneticpollutioncanthusbeavoided.Thedesigningofasystemoflong－distancecontrolbasedonsoundprocessingtechnologyandDTMFdecodingtechnologyispresentedinthispaper.Byusingsoundcommandsofsoundrecognitiontechnology,thissystemrealizesitscontrolofresidence.Theembeddedandintelligentsoundindication,itsoutstandingsoundfunctionofpromptanditscodecontrolsystemenabletheoperatorstotimelyobtaintherelativeinformationofthecontrolledobjectsthroughindicatedsounds.Thesystemcanusetelephonetocontrolmanylongdistancethroughutteringsoundcommandsandprovidesthecodesafeguardfunction.Onlythroughinputtingthecorrectpasswordtocontrolthem,theuserscancontroltheconditionofbeimproved.Thissystemispractical,andthefunctionisflexible,andtheoperationisconvenientwithbeusedextensiveinvariouskindsofcontrolequipmentto.L.Fike,GeorgeE.FriendTexasInstrumentsInc,2004：

20－35

18BushbyST.AstandardcommunicationinfrastructureforintelligentBuildings.AutomationinConstruction[J].2007.6:

19PersonalComputerXTATsystemTechnicalreferencemanual,IntelCorp.

附录A

PCREMOTECONTROLOFAPPLIANCESBYUSINGTELEPHONELINES

ABSTRACT

TheideaofHomeAutomationusingtelephonelinesandaPCwasshowninthisstudy.ThesystemwasbasedontheDualToneMultifrequency（DTMF）signalsthatcouldbesentthroughaloopofwiretoswitchonoffvariousappliancesviaaPersonalComputer（PC）.ThesystemtheTelephoneStandards.TheOffHookdetector,RingdetectorandanInputOutputPCInterfacingcard.Anexampleofcontrollinganappliancewasprovidedinthestudy.ThesoftwarecontrolprogrammingwaswritteninTurboBasicandtheirflowchartsarepresented.

INTRODUCTION

HomeAutomationthatwasintroducedinthisstudywasimplementedbydesigningthe"SmartControlSystemthatControlsAllAppliancesRemotelybyPhone".ThedesignwasbasedontheTelephonyStandardswhichmeantthatthesystemwasqualifiedtobeinstalledonthepublicswitchingsystems.ThesystemdesignwasutilizingtheDualToneMultifrequency（DTMF）signalsthatcouldbeproducedbythetelephoneset.Thesesignalsweresentfromtheuserendthroughtheloopwiretothedestinationend,wherethecontrolsystemwasstationed.Thesystemconsistedofthreemajorparts.ThefirstpartwastheringdetectorandDTMFreceiver.ThesecondpartwastheInputOutputinterfaceunit.ThethirdpartwasthepersonalcomputerwhichwasprogrammedwithTurboBasicSoftwaretoperformtheonlineoperations.Blockdiagramofthesystemwasshowninfigure1.

Figure1:

SmartcontrolsystemtocontrolAppliancesremotelybyphone

BRIEFOPERATIONOFATELEPHONESET:

Asummaryofthetelephonesetoperationwasgiven.Blockdiagramofatelephonesetisshowninfigure2.

（a）Localloop:

Eachsubscribertelephonewasconnectedtoanexchangeofficethatcontainedtheswitchingequipment,signallingequipmentandbatteriesthatsuppliedthedirectcurrenttooperatethetelephone.Eachphonewasconnectedtothecentralofficethroughalocalloopoftwowirescalledawirepair.OneofthewireswascalledT（fortip）andtheotheronewascalledR（forring）whichreferredtotheTIPandRINGpartsoftheswitchusedinmanualswitch-boards.Switchesintheexchangeofficerespondedtothedialpulsesortonesfromthetelephonetoconnectthecallingpartytothecalledparty.Whentheconnectionwasestablished,thetwotelephonescommunicatedovertransformercoupledloopsusingthecurrentsuppliedbytheexchangeofficebatteries.

（b）Initiatingacall:

Thesituationwherethe"receiver".Theoff-address.）

（c）SendingaNumber:

Sometelephonesetssentthetelephonenumbersbydialpulseswhileotherssentitbyaudiotones.Inthisstudy,audiotonetelephonesetswereused.Thesesetskeypadwith12keys.Pressingoneofthekeyscausedanelectroniccircuitinthekeypadtogeneratetwooutputtonesthatrepresentedthenumber.ThesetonesarecalledDualToneMultifrequency（DTMF）signals.

（d）ConnectingthePhones:

Theexchangeofficetheconnectionwasattempted,abusytonewasgeneratedbytheexchangeofficeandwasreturnedtothecallerphone.Otherwise,aringingsignalwassenttothecalledphonetoalertthecalledparty.Atthesametime,aringbacktonewasreturnedtothecallertoindicatethatthefailedphonewasringing.

e）AnsweringtheCall:

Whenthecalledpartyremovedtheresponsetoaring,thelooptothatphonewasclosedandaloopcurrentflowedthroughthecalledtelephone.Theexchangeofficethenremovedtheringingsignalandtheringbacktonefromthecircuit.

f）EndingtheCall:

Intoday'smostswitchingsystems,thecallwasended,theconnectionwasreleased,onlywhenthecallingartywenton-keypadwith12keyswhichrepresentedthenumbers0through9andthesymbol*and#.Seefigure3.PressingoneofthekeyscausedtheDTMFgeneratortogeneratetwotonesinthevoiceband（300-3,000Hz）.Therewasalowfrequencytoneforeachrowanda.Pressingkey5,forexample,generateda770Hztoneanda1,336Hztone.Byusingthedualtonemethod,12uniquecombinationswereproducedfromonlyseventoneswhenthe12positionkeypadwasused.

Figure3:

DTMFKeypadandFrequencies

Thefrequenciesandthekeypadlayoutinternationallystandardized,butthetolerancesonindividualfrequenciesvariedindifferentcountries.TheNorthAmericanstandardswere*1.5%forthegeneratorandf2.0%forthereceiver.ThetonesselectedcarefullysothattheDTMFreceiverintheexchangeofficewouldnotconfusethemwiththeothertonesthatmightoccuronth6line.TheseDTMFtonesfromtheexchangeofficeweretransmittedthesameasspeechoverthetelephoneline.ThispermittedustoreceivetheDTMFtonesbyoursystem'sDTMFReceiverifanynumberwaspressedonthekeypad.

a）DTMFReceiverCircuit:

ThetaskoftheDTMFReceiverwastodetectthepresenceofavalidtonepaironatelephonelineorothertransmissionmedium.Thepresenceofavalidtonepairindicatedasingledialleddigit.Inordertogenerateavaliddigitsequence,eachtonepairshouldbeseparatedbyavalidpause.ThefollowingtableshowedtheestablishedBellsystemstandardsforavalidtonepairandavalidpause：

Low-GroupTone：

697or770or852or941Hz

High-GroupTone：

1209or1336or1477or1633Hz

FrequencyTolerance：

for（1.5%+2Hz）

AmplitudeRange:

-24dBm.CA<+6dBm@600Ohm

ToneDuration:

40msorlonger

PauseDuration:

40msorlonger

Figure4showedthecompletecircuitfortheDTMFreceiver.ThecircuitemployedtheRadio-Shack（）DTMFReceiverIC.ItwasacompleteDualToneMultifrequency（DTMF）Receivercircuitdetectingaselectablegroupof12or16standarddigits.

Figure4:

DTMFReceiver&TelephoneSourcecontroller

TheblockdiagramoftheDTMFreceiverinternalstructure.Theanaloginputsignalwaspreprocessedbya60-Hzrejectfilter,apreamplifierandalowpassfiltertoemphasizethesignalpart.Theoutputofthepreprocessorstagewasthensplitintotwofrequencybands,eachofwhichcontainedonlyoneDTMFtonegroup.

Theoutputofeachband-splitfilterwasamplifiedandthefollowingzero-crossingdetectorconvertedthesinusoidalsignalstosquarewaves.Thesesquarewaves,passedthroughtonefrequencybandpassfilterstogeneratetheindividualfrequenciesineachtonegroup.Eachbandpassfilteroutputwasdetectedbyanamplitudedetectorandfedtoatimingcircuittodeterminethedetectionvaliditywithin40ms.Thedetectoroutputwasalsofedtoanoutputdecodertodecodethetonestotheirequivalentbinarynumbers.Thetimingcircuitryproducedthecontrolpulses,foranoutputregister.Forexample,thedatastrobefromthetimingcircuitenabledthedecoderoutputstobelatchedattheregisteroutputsD1,D2,D4,D8.Theregisteroutputsbecamevalidafteratonepairavalidpause.WhenHEXB28=1,theoutputwasHEXB28=0,theoutputwasabinarycode.Thefollowingtablesshowedthetwooutputformats.

A,B,CandDwereusedforextendedkeypads.TheDataValid（DV=l）pinindicatedavalidtonepairwassensedanddecodedattheoutputpinsofD1,D2,D4andD8.DVremainedinfigure4,theinputpins9and10ofDTMFreceiverICwereconnectedtoanIsolationtransformerwhichwasusedtoisolatethetelephonelinegroundfromthedigitalground.Pin10wastiedtothedigitalground,whichwastheinputground.TheRingterminalofthetelephoneli