外文翻译一种基于DS18B20的温度探测系统.docx

外文翻译一种基于DS18B20的温度探测系统.docx

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外文翻译一种基于DS18B20的温度探测系统

附录Ⅲ

ADesignoftheTemperatureTestSystemBased

onGroupingDS18B20

Abstract

AlltheDS18B20sensors,usedforthemultipointtesttemperature,areconnectedwithMCUononeofIObus,andtemperaturedataarecollectedbyturns.Ifthesystemhasalargeamountofsensors,thetimeofMCUusedinprocessingthetemperaturedataisobviouslyprolonged,sothecycleofalternatetestgetslonger.Inthispaper,anewmethodthatDS18B20arerationallygroupedispresented,andsomemeasuresaretakeninsoftware;asaresult,thespeedofalternatetestadvancesdistinctly.

Keywords-DS18B20Group,temperaturetest,timespentonthealternatetest.

1.INTRODUCTION

Asthesimplestructure,convenientinstallment,lowlossandwiderangeoftemperaturetest,DS18B20temperaturetestsensorsareappliedtothefieldswhichneedthemultipointtemperaturetest,suchasthechemicalindustry,thegrain,theenvironmentsupervisionandsoon.BecauseoftheadoptionofonebusintheDS18B20multipointtemperaturetestsystem,allDS18B20arehungononebus,andthenthetemperatureconversionvalueofeachtestpointisreadbyturns.Astheconversionvaluemustbereadafterreading-pinstatefor8times,andpositionandstoredatamustbemoved,sotimespendmuchinreadingonepointofthedatasystembyeverytime.Ifthetemperaturetestsystemislarge-scaled,thesystemlosscausedbyitisrathermuch,andthenthealternatetestspeedofthesystemdecreasesobviously,whichinfluencestheefficiencyofthemultipointtemperaturetestsystemseriously.Inthispaper,DS18B20arehungonsomeI/ObusesbygroupingDS18B20evenly,andtheconversiontemperaturedataisobtainedbyreadingthestateofDS18B20,thenthesystemlossdecreasesandthealternatetestspeedincreasesobviously,whichwon’tinfluencetheprecisionandthereliabilityoftheconversion.Asetofmultipointtemperaturetestofartificialenvironmentlaboratoryisachievedinthispaper,whichincreasesthetestefficiencyoftheformersystem.

2.CHARACTERISTICSOFDS18B20

DS18B20isthesinglebusdigitaltemperaturesensorfromAmericanDallasCompany.DS18B20isconsistedofthe64figuresROMengravedbylaser,thetemperaturesensitivitycomponent,non-volatiletemperaturealarmstrigger（DeviceTHandTL）.DS18B20communicateswiththemicroprocessorbythesinglebusportandthetestrangeofDS18B20isfrom-55centigradeto+125centigrade,andtheincrementalvalueiscentigrade.Thetemperaturecanbechangedintofigureswithin720msandeachDS18B20hasthesole64figuresserialnumber.

Fig1DS18B2064bitROM

ThespecificcontentisrevealedasFig1:

Therearetwo8figuresstoragesandforstoringtemperaturevalueinDS18B20.storagestorescomplementofthetemperaturevalue,andstoressymbolsofthetemperaturevalue.Theusercandefinenon-volatiletemperaturealarmssetsanddistinguishthealarmssearchorderandseekthecomponenttemperaturealarmsstateoutsidethescheduledlimit.Therearetwoalternativewaysofpowersupply:

Signalbushigh-levelborrowpowerisadopted,orthe+5vpowersupplyexternallyisadopteddirectly.

3.APPLICATIONTHEGROUPINGTESTMETHOD

ThispaperillustratesthegroupingmethodwiththeinterfaceofDS18B20and89C52.AssumingtheamountofthebusesonP1portis4andthetemperaturetestsystemneeds100DS18B20sensors,whichcanbedistributedequallytothe4I/Olines.Ifthenumberofsensorscannotbedividedbythenumberofbuseseven,thenumberdisparityofsensorsonbusesisnomorethanone,whichcanbehandledwhilereadingnumbers.Thepowerissuppliedexternally.OwningtothesynchronisticconversionineachDS18B20,theintensecurrentisneeded,andthesignalbuscannotbeusedforthepowersupply,otherwisethesystemcannotworkinorder.TheschematiccircuitisshownasFig2（theDS18B20signalbusesofthesamegrouparehungonsomebusesofP1port）.WhenreadandwritetheDS18B20,thestrictschedulemustbekept.FirstareversionpulseissenttoallDS18B20.Afterthereversion,SkipROMorderissenttoeachcircuitsimultaneouslyfromtheI/Oport,andtheconversionorderissent,thenallsensorsbegintransform.Aftertheconversion,MatchRomorderissenttoeachcircuitsimultaneously,and64bitsserialnumberissent.DS18B20isselectedforeachgroup,andScratchPaddataisread.Finallythedataistransformed.Thedataofserial-readistransformedintotheactualtemperaturevalue.OnealternatetestisfinishedaftertheDS18B20temperaturedataisreadcompletelybythecyclicalreadingfor25times.

Fig2DS18B20groupingsketchmap

Nowthetime-consuminginthetestsystemofthesinglebusandthegroupinganalysesmethodisillustratedrespectively.Thereversiontimesequenceandthetimesequenceofwritingandreadingonebitforthemicroprocessorarerevealedinfigures4-6.Thefigureshow:

ThereversionperiodofDS18B20is495us-1020us;thewritingperiodofonebitis60us-120us;thereadingperiodofonebitisabove60us;thespanofwritingorreadingthenextbitis1us.AstheA/Dconversiontimeis（9precisions）,ifitiscountedbytheshortestway,thetotaltime-consumingofalternatetestiscalculatedrespectivelyasfollows:

（1）Singlebus

495us+2*（8*60+7）us++495us+100*（64*60+

63+8*60+7+9*60+8）us=

（2）Groupingmode

495us+2*（8*60+7）us++20（64*60+63+8*60+7+9*60+8）us=

Asthesmallproportionofthenumerationsystemconversionandthestoragetimeinthewholeperiod,theunknowncrystal-oscillatorfrequency,thenumerationsystemconversionandstoragetimeisnotcounted.Accordingly,thealternatetesttimewhichgroupingmodeconsumesismuchshorterthansinglebusmodeobviously.

4.EXAMPLEOFTHEDESIGN

Theasphalttransportationvehicleisthemaintransportationequipmentbetweenthematerialfieldandroadsurface.Theunavoidabletemperaturedecreasingbecauseoftheasphalttransportationvehicle’slongworkingandtransportationdistanceinfluencesthepavingqualityoftheroadsurface;thespecificmeasuresmustbetakenaccordingtotheheatreleaseoftheshell.ThispaperdesignedasetofwirelesstemperatureusingDS18B20groupingmodetestsystemfortestingthetemperatureoftheasphalttransportationvehicleshell,andthetotalpointsis120.Temperaturetestsystemsoftwareadoptsthemodulardesign.Thehypogenousmachinecollectsdata,storesdata,setsupDS18B20,andsendsthewirelessmoduleandsoon.TheepigenousmachineadoptsPCmachines,mainlyreceivesthetemperaturedatafromthehypogenousmachine.Theepigenousmachinedisplays,storesandmanagesdata.Thesimplecommunicationbetweenpeopleandmachinesisperformedbytheepigenousmachine.Thispaperwillnotillustratethesimpleprocedureoftheepigenousmachineindetail.Thefollowingistheillustrationofpartsofhypogenousmachine.

hardware

ConsideringthemultipointtemperaturenumberofthetemporarystorageandtheconsiderableinternalRAMduringthevalueconversion,thechiefcontrollingchipadoptsATMEL89C52Single-ChipMicrocomputerwith256bytesRAMand8KBE2PROMprocedurestorage.AsthedistinguishablecodeofDS18S20isreadandnumbered,theliquidcrystalmodule（AoKelaChineseintegratedmoduleofOCMJJinPengCompany）andthekeyboardmoduleareadded.Thewirelessdigitaltransmissionadoptsthewirelessmodule375inthewholereception-sendingform,whichmayhastwoamateurbandstochooseandtheregulativeBaudRate（themaxis20Kbit/s）,andtheSingle-ChipMicrocomputerserialportdatacanbereceiveddirectly.

DS18B20,withthepowersupply,dividedinto8groupshungonP1portThewirelessmoduleishungonserialportdirectlyandthehardwarewatchdogadoptstheMAX813chip.Whenthepowerisaddedtothesystem,thereversionsignalistransmittedfromtheMAX813reversionpin,andthevalueofthereversionpulseis200ms.Whentheprocedureisinorder,apulsesignalmustbesenttoMAX813WDIpininnomorethantheintervaloftoclearawaythewatch-dogtimer.Iftheintervalismorethan,thepindoesnotreceivethepulsesignal,andthenthe89C52mustbereversed.As120DS18B20serialnumbersmustbestoredinthesystem,thedatastorageDS1225（8K）againstthepowerfailureisdeveloped.

softwarefunctionandprocess

ThesoftwarepartofthetemperaturetestsystemnumbersDS18B20,collectsandtransformsdata,performsthewirelesscommunication,manageskeyboardandsoon.Fortheconvenienceoftheproceduredebuggingandthereliability,themoduledesignisadopted,mainlyincludingthekeyboardprocessingmodule,thewirelesscommunicationmodule,themoduleoftemperaturecollectionandprocessing,thedisplaymoduleandsoon.Thechiefproceduremanagesthekeyboard,initializesthesystemandtransferseachfunctionalmodule.ThehaullineiskepttoperformDS18B20editmission.120pointsserialnumberofDS18B20isreadbythekeyboardanddisplaycoordinationandnumberedintoDS1225Y.Firstthewirelessmoduleissetupasthereceptionstatetoreceivethecollectionparametersandstarttheorder（Thetransmissioncontentissentbypack;thesamecontentissentforthreetimes;twooutofthreelogicisperformedaccordingtothebit）.

Thewirelessmoduleissetupasthesleepstateduringtheconversionandthetransformingstateduringthetemperaturedatatransmission.PackingsendsthetemperaturedataandtheDS18B20numbersinthesystemtoepigenousmachine.ThepartsofcollectionandconversionstarttheDS18B20conversion,readthetemperaturedatabygroupingmethods,storedataandsoon.Thefollowingprocedureisthemaincontentofcollectingandconversionmodules.

5.CONCLUCTION

Authorscreatethefollowingnewideas: