Sensixa EARL1 ear worn Activity Recognition Sensor User Manual

Sensixa Ltd. ear worn Activity Recognition Sensor

User Manual

1EURegulatoryConformanceHereby,SensixaLtddeclaresthatthisdeviceisincompliancewiththeessentialrequirementsandotherrelevantprovisionsofDirective1999/5/EC.Forthedeclarationofconformity,visittheWebsitewww.sensixa.com.Notice:Observethenationallocalregulationsinthelocationwherethedeviceistobeused.ThisdevicemayberestrictedforuseinsomeorallmemberstatesoftheEuropeanUnion(EU)FCCStatementHereby,SensixaLtddeclaresthatThisdevicecomplieswithpart15oftheFCCrules.Operationissubjecttothefollowingtwoconditions:(1)thisdevicemaynotcauseharmfulinterference,and(2)thisdevicemustacceptanyinterferencereceived,includinginterferencethatmaycauseundesiredoperation.Changesormodificationsmadetothisequipmentnotexpresslyapprovedby(manufacturername)mayvoidtheFCCauthorizationtooperatethisequipment.
21.0IntroductionThee‐AR(ear‐wornActivityRecognition)isabio‐inspireddesignedsensorwhichemulatesthefunctionofthehumanvestibularsystemindetectingbodymovementsandorientations.Bypositioningthee‐ARsensorontheuser’sear,gait,bodypostureandactivityinformationcanbecapturedbytheminiaturisedsensor.Ithasbeenwidelyappliedandtrialledinsports,wellbeingandhealthcareapplications.Fromthetrialsconducted,numerousrequestshavebeenreceivedforapplyingthee‐ARsensorforotherapplications,suchaslongtermactivitymonitoringforelderlypatients.Inrespondtothepotentialdemands,thee‐ARlitesensorhasbeendesignedtargetinglongtermmonitoringapplications.ThisdocumentprovidesthenecessaryinformationfortheCEandFCCcomplianceexaminations.2.0eARlitesensorsystemThee‐ARlitesensormainlyconsistsofane‐ARlitesensorandabasestation.Theear‐worne‐ARlitesensorisdesignedtocapturethepostureandactivityoftheuser.Thebasestation,ontheotherhand,issimplyachargingstationandanadaptorforlinkingthesensortoaPC.Figure1depictsthesensingsystemdiagram.Figure1e‐ARlitesensorandbasestation
32.1eAR(earwornActivityRecognition)litesensorThee‐AR(ear‐wornActivityRecognition)litesensor,asshowninFigure2,isabio‐inspiredsensordesignedtoemulatethemainfunctionsofthehumanvestibularsystem.Bypositioningthesensorontheear,thesensitivesensorcancapturethesimilarinformationasperthehumaninnerear,anddetectthepostureoftheperson.Figure2Thee‐AR(ear‐wornActivityRecognitionSensor)litesensorThee‐ARsensormainlyconsistsofaMEMSbased3Daccelerometersensor,amicrocontroller,aradiotransceiverwithUSBinterface,aflashmemoryandarechargeablebattery.TheMEMSbased3Daccelerometerisamicromechanicalsensorwhichcanmeasuretheaccelerationwithregardtogravity.Thetypicalsamplingfrequencyis1Hzperaxis.Thesensorisdesignedwithamicrocontrollerwhichcanbeprogrammedandconfiguredfordifferentapplications.Thelowpowerradiotransceiver,withmaximumdatarateof2Mbps,enablesreal‐timetransmissionofsensordatatoareceiver,andtheradiotransceiverhasabuilt‐inUSBinterfacewherethesensorcanplugontoaPCviathebasestationfordownloadingthesensordata.Theon‐boardflashmemorycanbeusedtostoresensordata,anditcanstoreupto1weekofrawaccelerometerdata.Withthelowpowerprocessorandradiotransceiver,thee‐ARlitesensorcanoperatecontinuouslyfor1weekafteritisfullycharged.Inaddition,toensurereliabilityofthesensor,thesensorisdesignedtobewaterproofedanditcanoperateunderupto1metreofwater.
42.2eARLitebasestationThebasestationissimplyanadaptorforconnectingthee‐ARlitesensortoaPC,anditisadockingstationforchargingthebatteryofthee‐ARlitesensor,asshowninFigure3.Figure3e‐ARliteBasestationThebasestationisdesignedtoconnecttoaPCoraUSBpoweradaptorwithamicroUSBconnector.Toeasethedockingofthee‐ARlitesensorandprovidesecureconnections,permanentmagnetsareembeddedonthebasestation.Whenane‐ARlitesensorisdockedontothebasestation,theLEDatthefrontofthebasestationwilllightupandthee‐ARsensorwillbedirectlyconnectedtotheattachedPCviatheconnectingpinsonthebasestation.
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7eARLitesensortechnicalspecificatione‐ARLitesensorTechnicalSpecificationsOperatingvoltagerange2.7‐3.6VRadioOperatingfrequency2400‐2483.5MHzMaximumradiooutputpower0dBmRadioReceiverSensitivity ‐82dBmMaximumGFSKdatarate2MbpsOperatingTemperature‐10to40oCSensingRange3gSensingsamplingfrequency1Hzto500HzExtendedMemory16MBProgrammemory32KB(MSP430F2274),32KB(nRF24LU1+)RAM1KB(MSP320F2274),2KB(nRF24LU1+)BatterytypeLithiumPolymerBatterycyclelife300cyclesBatterycapacity45mAhrBatterylife3hours(real‐timemode)/12hours(storagemode)Operatingvoltage3VWaterresistant IP67

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