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1、MEASUREMENTOFTEMPERATUREANDHUMIDITYUSINGSHT11/71INTELLIGENTSENSORAssist.Prof.GrishaSpasov,PhD,BScNikolayKakanakovDepartmentofComputerSystems,TechnicalUniversity–branchPlovdiv,25,“TzankoDjustabanov”Str.,4000Plovdiv,Bulgaria,+35932659576,e-mail:gvs@tu-plo
2、vdiv.bg,kakanak@tu-plovdiv.bgKeywords:temperatureandhumiditymeasurements,intelligentsensors,distributedautomationandcontrolThepaperdiscussestheadvantagesofintelligentsensors.ItpresentsanSHT11/71temperatureandhumiditycombinedsensorfromSensirion.Thissenso
3、risidealfordevelopingdistributedembeddedsystemsformonitoringenvironmentalparameters.AnexampleapplicationusingthissensorisaddedtopresentSHT11/71inrealworkingcondition.Theapplicationisdistributedsystemformonitoringtemperatureandhumidity.Itusesamicrocontro
4、llerwithintegratedwebservertoorganizethecommunicationandmanagementofsensors.Thisapplicationisrealizedandtested.1.INTRODUCTIONMeasurementandcontroloftemperatureandrelativehumidityhassignificantapplianceinindustry,science,healthcareagricultureandcontrolli
5、ngtechnologicalprocesses.Thesetwoenvironmentalparametersstronglyinfluenceeachotheranditiscriticalinsomeapplicationtomeasuretheminparallel.Usingmoderntechnologiesitispossibletocombinetemperaturemeasurementelement,humiditymeasurementelement,amplifier,ADC,
6、digitalinterface,calibrationmemoryandCRCcalculationlogicinasinglechipwithverysmallsize[1,3].Usingintelligentsensorsofthiskindcanshortenthedevelopmenttimeandcost.IntegratingADCandamplifierintosensor’schipallowdeveloperstooptimizesensorelementsforaccuracy
7、andlong-termstability.Andthatisnotall–integratingdigitalinterfacelogicsimplifiesconnectivityandmanagementofsensors.Theseadvantagescanreducewholetime-to-markettimeandevenprice[1,3].InpresentedpaperweuseSHT11/71intelligentsensorfromSensirionasanexampleand
8、presentitsadvantagesandmeasurementprocedures.Anexampleapplicationisalsopresentedtodemonstrateitsworkinrealconditions.Thisapplicationisrealizedandtested.2.INTELIGENTSENSORS–SHT11/71SHT11/71isasinglechiprelativehumidityandtemperatu
