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1、附录ⅢADesignoftheTemperatureTestSystemBasedonGroupingDS18B20AbstractAlltheDS18B20sensors,usedforthemultipointtesttemperature,areconnectedwithMCUononeofIObus,andtemperaturedataarecollectedbyturns.Ifthesystemhasalargeamountofsensors,thetimeofMCUusedinprocessingthetemperaturedataisobviou
2、slyprolonged,sothecycleofalternatetestgetslonger.Inthispaper,anewmethodthatDS18B20arerationallygroupedispresented,andsomemeasuresaretakeninsoftware;asaresult,thespeedofalternatetestadvancesdistinctly.Keywords-DS18B20Group,temperaturetest,timespentonthealternatetest.1.INTRODUCTIONAst
3、hesimplestructure,convenientinstallment,lowlossandwiderangeoftemperaturetest,DS18B20temperaturetestsensorsareappliedtothefieldswhichneedthemultipointtemperaturetest,suchasthechemicalindustry,thegrain,theenvironmentsupervisionandsoon.BecauseoftheadoptionofonebusintheDS18B20multipoint
4、temperaturetestsystem,allDS18B20arehungononebus,andthenthetemperatureconversionvalueofeachtestpointisreadbyturns.Astheconversionvaluemustbereadafterreading-pinstatefor8times,andpositionandstoredatamustbemoved,sotimespendmuchinreadingonepointofthedatasystembyeverytime.Ifthetemperatur
5、etestsystemislarge-scaled,thesystemlosscausedbyitisrathermuch,andthenthealternatetestspeedofthesystemdecreasesobviously,whichinfluencestheefficiencyofthemultipointtemperaturetestsystemseriously.Inthispaper,DS18B20arehungonsomeI/ObusesbygroupingDS18B20evenly,andtheconversiontemperatu
6、redataisobtainedbyreadingthestateofDS18B20,thenthesystemlossdecreasesandthealternatetestspeedincreasesobviously,whichwon’tinfluencetheprecisionandthereliabilityoftheconversion.Asetofmultipointtemperaturetestofartificialenvironmentlaboratoryisachievedinthispaper,whichincreasesthetest
7、efficiencyoftheformersystem.2.CHARACTERISTICSOFDS18B20DS18B20isthesinglebusdigitaltemperaturesensorfromAmericanDallasCompany.DS18B20isconsistedofthe64figuresROMengravedbylaser,thetemperaturesensitivitycomponent,non-volatiletemperaturealarmstrigger(DeviceTHandTL).DS18B20communicatesw
8、iththemicroprocesso
