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ThevendingmachinelogiccircuitdesignandsimulationCengJurongJournalofchongqingcollegeofliberalartsSichuan64400Abstract:thevendingmachineisabletoputthecoinvendingmachine,theuseofdigitallogiccircuitarealsogiveninthispapertheprocessdesignofavendingmachine,andthroughtheMultisimsimulationsoftwareplatformfordebugging,verifythevalidityofthedesign.Keywords:vendingmachine,Logiccircuit;,MultisimWiththedevelopmentofscienceandtechnologyandtheprogressofthesociety,mechanicalautomationbusinessaremoreandmorewidelyused.Thevendingmachineisabletoputthecoinvendingmachine,isthecommonuseofthecommercialautomationequipment,notlimitedbytimeandplace,cansavemanpowermaterialresources,isatrendofsocialdevelopment.Atpresentalotofwaysforthevendingmachine,mostofthePLCandsingle-chipmicrocomputer,theFPGAimplementation.Althoughthefunctionsareveryperfect,butfromthecostintoconsideration,thispaperputsforwardthevendingmachineadoptsthelogiccircuitdesign,economicalandpractical.Forbeginnerselectronics,canusedigitallogiccircuittodesignappropriateactualthingsoflife,morecanstimulatetheirinterestinlearning,andhavecertainchallengesJrisks,canreflecttheirdigitalelectronictechnologycourseknowledgeintegrateduseofskills,andtheuseofsimulationsoftwareMultisimability.Inthispaper,weuse74LSseriesdigitalintegratedcircuitdesignoutofavendingmachine,itsspecificfunctionasfollows:(1)therearetwoslot,Angleofslot1and$5respectively;(2)everytimecanonlyput1RMB1or5Anglecoin;(3)after1yuan5Angleintothecoinslotmachineautomaticallygive1bottleofmineralwater;(4)invested$2COINS,inthegiven1bottleofmineralwateratthesametimefind15Angleofcoin.1thedesigndiagramofvendingmachinesVendingmachineoveralldesignblockdiagramisshowninfigure1iscomposedof4partscircuit,inputcircuitismainlytoidentifytrueandfalseofthecoinandthevalueofthecoin,inthisarticleisnotinvolvedinthispartofthecircuitdesign,thecoininputcircuitswitchisusedtosimulate;Operationcircuitmainlycompleteputinacoinstack;Signaloutputcircuitaregivengoodsandchange;Controlcircuitaccordingtotheinputsignalandoutputsignalofoperationcontrolofthecircuit.InputcircuitOperationcircuitOutputcircuitControlcircuitThedesigndiagramoffigure1avendingmachine2thedesignofthemaincircuit2.1operationcircuitdesignOperationcircuitconsistsof4bitcarrylookaheadadderof74LS283andfourregisters74ls175,itsprinciplediagramisshowninfigure2.Figure2operationcircuitprinciplediagramIntotheelectricalsignalthroughinputcircuitswitchingoutthecointosimulatewithtwobuttons.A1yuancoin,saidinvestmentintoadderinputbinarynumberis1010,saidanotherfiveAngleintothecoinslotandconvertedintobinaryadderinputfor0101.74LS175registerusedfortemporarystackingresult,beforethecoinsystemforzerostate,whichis74LS175Qendalloutputis0.Thenanaddendis0,74LS283whenacoinsignal,74LS283achieveaaddoperation,coinsignalgeneratedbythecontrolcircuittoproducearisealongtheclocksignalandtheresultswerealsoput74LS175register.Ifthecoinagain,74LS283implementationwiththelastcoinintostack.Untiltheinputnumberis1yuancoin5Angleor2yuan,throughthecontrolcircuittogenerateresetsignal.Thiscompletesakiosk.2.2controlcircuitdesignControlcircuitmainlycompleteoperationcircuitregister74LS175producesandsellsthegoodsoftheclocksignalaftertheresetsignal,itsdesignprinciplediagramisshowninfigure3Figure3controlcircuitprinciplediagramWhenswitchingpowersupplyvoltage,RandC,circuitoutputinstantaneoushighlevelafteranorgateG,output,lowlevel,whichshowsaresetsignaltomakeoperationcircuitofregister74ls175+0,isinthereadystatecircuit.Whenthereisnocoinsignal,doorG,outputforthehighlevel,throughthedoorG:invert,outputforthelowlevel.Whenacoinsignal,namelythedoorG,haveahighlevelpulse,theoutputislowlevel,G2invertoutputhighlevelthroughthedoor,G:outputfromlowleveltohighlevel,soastogetarisealongtheclocksignal,register74ls175updatethecheckresultofadder.InordertoensurethattheclocksignaltoregisterregisterdatainputD,a,D,thestatehassteadilybuiltup,inG,theoutputendofthejoinof50pFacapacitanceC:delaylink.Whenthegoodshavegivensignal,G3gateoutputshighlevel,afterthedoorG,outputlowlevelgivesaresetsignaltoregister74ls175,makeitsoutputto'`0',completeavending,circuitagainintothereadystate.2.3outputcircuitdesignOutputcircuitneedstobegivengoodsandchangethetwosignalsarepresented.TheinputofcoinofAngleisonly1and$5,thenonlythreekindofsituations:(1)whenputintoCOINSare5horn,requiresthreetimes,accumulativeresultsof0101+0101+0100=1111,registeroutputfor1111,outputahighlevel,i.e.thegoodssignal,whilethechangeofoutputdisplayis0;(2)whentheAngleintoCOINSof15and1of1yuan,accumulativeresultsof0101+1010=1111,registeroutputfor1111,outputahighlevel,i.e.thegoodssignal,whilethechangeofoutputdisplayis0;(3)whenputin1yuancoin,requirestwice,accumulativeresultsof1010+1010=0100,registeroutputfor0100,outputahighlevel,i.e.thegoodssignal,changeatthistimetheoutputisshownas5,namelyexit15Anglecoinsystem.Itsprinciplediagramdesignasshowninfigure4.Figure4outputcircuitprinciplediagram2.4theoverallcircuitdesignandsimulationWillfigure2,figure3andfigure4accordingtotherelationshipbetweeneachothertogether,makeupcompletecircuitdiagramof