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1、ADesignoftheTemperatureTestSystemBasedonGroupingDS18B20AbstractAlltheDS18B20sensors,usedforthemultipointtesttemperature,areconnectedwithMCUononeofIObus,andtemperaturedataarecollectedbyturns.Ifthesystemhasalargeamountofsensors,thetimeofMCUusedinprocessingthetemperatureda
2、taisobviouslyprolonged,sothecycleofalternatetestgetslonger.Inthispaper,anewmethodthatDS18B20arerationallygroupedispresented,andsomemeasuresaretakeninsoftware;asaresult,thespeedofalternatetestadvancesdistinctly.Keywords-DS18B20Group,temperaturetest,timespentonthealternat
3、etest.1.INTRODUCTIONAsthesimplestructure,convenientinstallment,lowlossandwiderangeoftemperaturetest,DS18B20temperaturetestsensorsareappliedtothefieldswhichneedthemultipointtemperaturetest,suchasthechemicalindustry,thegrain,theenvironmentsupervisionandsoon.Becauseofthead
4、optionofonebusintheDS18B20multipointtemperaturetestsystem,allDS18B20arehungononebus,andthenthetemperatureconversionvalueofeachtestpointisreadbyturns.Astheconversionvaluemustbereadafterreading-pinstatefor8times,andpositionandstoredatamustbemoved,sotimespendmuchinreadingo
5、nepointofthedatasystembyeverytime.Ifthetemperaturetestsystemislarge-scaled,thesystemlosscausedbyitisrathermuch,andthenthealternatetestspeedofthesystemdecreasesobviously,whichinfluencestheefficiencyofthemultipointtemperaturetestsystemseriously.Inthispaper,DS18B20arehungo
6、nsomeI/ObusesbygroupingDS18B20evenly,andtheconversiontemperaturedataisobtainedbyreadingthestateofDS18B20,thenthesystemlossdecreasesandthealternatetestspeedincreasesobviously,whichwon’tinfluencetheprecisionandthereliabilityoftheconversion.Asetofmultipointtemperaturetesto
7、fartificialenvironmentlaboratoryisachievedinthispaper,whichincreasesthetestefficiencyoftheformersystem.2.CHARACTERISTICSOFDS18B20DS18B20isthesinglebusdigitaltemperaturesensorfromAmericanDallasCompany.DS18B20isconsistedofthe64figuresROMengravedbylaser,thetemperaturesensi
8、tivitycomponent,non-volatiletemperaturealarmstrigger(DeviceTHandTL).DS18B20communicateswiththemicroprocessorby
