Sensixa EARL1 ear worn Activity Recognition Sensor User Manual

Sensixa Ltd. ear worn Activity Recognition Sensor

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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.

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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)

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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.

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Changesormodificationsmadetothisequipmentnotexpresslyapprovedby(manufacturername)

mayvoidtheFCCauthorizationtooperatethisequipment.

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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.

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Figure1e‐ARlitesensorandbasestation

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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.

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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.

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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.

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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

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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Polymer

Battery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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Sensixa EARL1 ear worn Activity Recognition Sensor User Manual

Sensixa Ltd. ear worn Activity Recognition Sensor

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