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1、MEASUREMENTOFTEMPERATUREANDHUMIDITYUSINGSHT11/71INTELLIGENTSENSORAssist.Prof.GrishaSpasov,PhD,BScNikolayKakanakovDepartmentofComputerSystems,TechnicalUniversity–branchPlovdiv,25,“TzankoDjustabanov”Str.,4000Plovdiv,Bulgaria,+35932659576,e-mail:gvs@tu-plovdiv.bg,kakanak@t
2、u-plovdiv.bgKeywords:temperatureandhumiditymeasurements,intelligentsensors,distributedautomationandcontrolThepaperdiscussestheadvantagesofintelligentsensors.ItpresentsanSHT11/71temperatureandhumiditycombinedsensorfromSensirion.Thissensorisidealfordevelopingdistributedem
3、beddedsystemsformonitoringenvironmentalparameters.AnexampleapplicationusingthissensorisaddedtopresentSHT11/71inrealworkingcondition.Theapplicationisdistributedsystemformonitoringtemperatureandhumidity.Itusesamicrocontrollerwithintegratedwebservertoorganizethecommunicati
4、onandmanagementofsensors.Thisapplicationisrealizedandtested.1.INTRODUCTIONMeasurementandcontroloftemperatureandrelativehumidityhassignificantapplianceinindustry,science,healthcareagricultureandcontrollingtechnologicalprocesses.Thesetwoenvironmentalparametersstronglyinfl
5、uenceeachotheranditiscriticalinsomeapplicationtomeasuretheminparallel.Usingmoderntechnologiesitispossibletocombinetemperaturemeasurementelement,humiditymeasurementelement,amplifier,ADC,digitalinterface,calibrationmemoryandCRCcalculationlogicinasinglechipwithverysmallsiz
6、e[1,3].Usingintelligentsensorsofthiskindcanshortenthedevelopmenttimeandcost.IntegratingADCandamplifierintosensor’schipallowdeveloperstooptimizesensorelementsforaccuracyandlong-termstability.Andthatisnotall–integratingdigitalinterfacelogicsimplifiesconnectivityandmanagem
7、entofsensors.Theseadvantagescanreducewholetime-to-markettimeandevenprice[1,3].InpresentedpaperweuseSHT11/71intelligentsensorfromSensirionasanexampleandpresentitsadvantagesandmeasurementprocedures.Anexampleapplicationisalsopresentedtodemonstrateitsworkinrealconditions.Th
8、isapplicationisrealizedandtested.2.INTELIGENTSENSORS–SHT11/71SHT11/71isasinglechiprelativehumidityandtemperatu
