PrepaidEnergySystemGroup21Sponsoredby:

◦ YoussefOjeil (EE)◦MichaelCuervo (EE)◦MD.S.Rahaman (EE)◦ Sahin Okur (EE)

SupervisedbyDr.Chung-YongChan

GoalsandObjectives• Alternativepre-paid solutiontoconventionalutilitybilling• RFID/NFC technologyallowsforquick payment• EnablestheInternetofThings(IoT)sotheusercanalwaysbeconnectedto

thesystem• Androidapplicationprovidestheuserwithreal-timedatain thepalmof

theirhands• Easy accesstostatisticsgivestheuser moreawarenessandcontrol ofusage• Automaticconnect/disconnectcapabilityrelievestheburdenfromthe

utilityproviders

Requirements• MustfacilitatemobilepaymentviaRFID/NFC

• IncorporatingTexasInstrument's3PhasePowerMeter

• Datausageaccessible throughWi-Fi

• FriendlyUserInterface(AndroidApplication)

RelevantStandards• Wi-Fi

o IEEE802.11b/g/n

o WPA/WPA2/WEP

• RFID/NFC

o ISO-14443A

o ISO-14443B

o ISO-15693

o FeliCa

BlockDiagramPower SupplyAC Main

MCU

RFID Chip

Comparator

Power Meter

Circuit Breaker Load

3.3 V

3.3 V

12 V

DesignandImplementation

PowerMeterPower SupplyAC Main

MCU

RFID Chip

Comparator

Power Meter

Circuit Breaker Load

3.3 V

3.3 V

12 V

EVM430-F6779 - 3PhaseElectronicPowerMeter• Runreal-timeelectricitymeteringapplications

• ProvideACpowermeasurementsforupto3phase

• GUIforcalibration,measurementdisplay,etc

• RS-232interfaceforexternalcommunication

• 160segmentLCDdisplay

• SupportsWi-FiandZigBee

SolidStateRelay• Loadcurrent75A

• Input:• InputDCcontrol3-32V• Triggercurrent7.5mA/12V

• Output:• Operatingvoltage90-480V• Weight:125g

ComparatorTL084• MCUOutputvoltage3.3

• Raisethevoltageto12V.

• Usingasalogiccircuiteither0to12voltoutput.

ComparatorLogicCircuit@3.3VINPUTOUTPUTLESSTHAN0 @0VINPUTOUTPUT12V

RFIDPower SupplyAC Main

MCU

RFID Chip

Comparator

Power Meter

Circuit Breaker Load

3.3 V

3.3 V

12 V

RFID• NFCischosensincenearfieldcommunicationismoresecure

•Operatesat13.56MHz

• Containstwoseparateparts:theHostandtheTag• Usedforpayments

RFIDTransceiver- TRF7970A• RFID/NFC Reader,NFCPeer,orinCardEmulationmode

• RFFieldDetectorforNFCPhysicalCollisionAvoidance•13.56MHz HFRFIDReader/Writer

• SupportsISO15693,18000-3,14443A/B,andFeliCa•OperableatFullPowerorHalfPower(5or3.3V)• UltraLow-PowerSystemDesign(PowerDown<1µA)

• ParallelorSPIInterface

RFIDBoosterPack- TRF7970ABP• CompatiblewithNFCLink Library

• CompatiblewithCC3200LaunchPad

• SupplyVoltage2.7– 5.5V• 127byteFIFObuffer• 0.5uA PowerDown

• 2mAStandbyMode

•On-boardAntenna•OperationalPowerSuppliedbyLaunchPad

TRF7970AOperableModesReader/Writer CardEmulation P2P

Technology Bitrate(kbps)

Technology Bitrate(kbps)

Technology Bitrate(kbps)

NFC-A/B(ISO14443A/B)

106,212,424, 848

NFC-A/B 106 NFC-A 106

NFC-F (JIS:X6319-4)

212 , 424 N/A N/A NFC-F 212, 424

RFID &MCUBlockDiagram

PhoneSelection• Android– OpenSource&NFCsince2008• NexusS&Nexus4• NexusSwasinitiallyusedbecauseitwascheap• Nexus4usedbecauseofAndroid4.4• BroadcomNFCchip,whichemulatesaTag4TypeISO14443A• Android4.4wastheminimumOSforimplementingHostCardEmulationwhichusestheNDEFprotocol

NDEF• NFCForumDataExchangeFormatisalightweightbinarymessagecommunicationprotocol

• NDEFMessagesarethebasic"transportation"mechanismforNDEFrecords.Eachmessagecancontainoneormorerecords.

• NDEFRecordscontainaspecificpayload,andfollowaspecificstructurethatidentifiesthecontentsandsizeoftherecord.

• SinceweareemulatingType4tags,APDUcommands(likeREADBINARYandSTOREBINARY)areusedtoreadandstoreNDEFdatatocompletethecommunicationbetweenthereaderandthephone.

•Awaittimeextensionrequestwasbeingsentoutbythephone.ThishadtobeechoedbytheRFIDreader.

AndroidApplication

• UserInterface•Mobileappwillhavealertsystem• Emulatingatransponder tagusingHCE• EmulateAndroidPay• RetrieveDatathroughWi-Fi

MCUPower SupplyAC Main

MCU

RFID Chip

Comparator

Power Meter

Circuit Breaker Load

3.3 V

3.3 V

12 V

WirelessCommunication

Parameter Bluetooth ZigBee Wi-Fi

Frequency 2.4GHz 800-900MHz,2.4GHz 2.4GHz,5GHz

Range 10m 10- 100m Upto100m

DataRate 1Mbps 250kbps 54Mbps

PowerConsumption Medium Low High

ImplementationComplexity Easy Moderate Difficult

MicrocontrollerUnit•CC3200WirelessMCU◦ ARMCortex-M4CPUat80MHz◦ IntegratedNetworkProcessor◦ SimpleLink Library◦ 4Low-PowerModes

9mmx9mm

MicrocontrollerUnit:PrototypingCC3200LaunchPad◦ On-boardAntenna◦ BoosterPackHeaders◦ PoweredFromUSB◦ JTAG/FTDI

ProcessFlowDiagramINIT APProvisioning SaveConfigTo

Flash

ConnecttoNetwork AdvertisemDNS

NFCReaderActive

(EnterIdleState)

Retrieve/ProcessDataFromPower

Meter

PaymentAcquired?

No

Yes

ProcessandSendEmail

Confirmation

If$$Low,SendSMS

Check$$AndTurnPowerON/

OFF

ProcessFlowDiagramINIT APProvisioning SaveConfigTo

Flash

ConnecttoNetwork AdvertisemDNS

NFCReaderActive

(EnterIdleState)

Retrieve/ProcessDataFromPower

Meter

PaymentAcquired?

No

Yes

ProcessandSendEmail

Confirmation

If$$Low,SendSMS

Check$$AndTurnPowerON/

OFF

Wi-Fi:PowerMeter• CC3100onpowermeterhostsHTTPwebserver

• CC3200actsasHTTPClient

Wi-Fi:Phone•mDNS broadcaststophone

• Sendspaymentconfirmationandalerttoemailandphone

PCB

PowerSupplyUnitPower SupplyAC Main

MCU

RFID Chip

Comparator

Power Meter

Circuit Breaker Load

3.3 V

3.3 V

12 V

PowerSupplyDesign

120VACto12VDC(Stage1)Design:PMP8764

VinMin =110.0VVinMax =130.0VVout =12.0VIout =1.0ADevice=PMP8764Topology=FlybackBOMCount=35TotalPd =1.25W

12 VDCto3.3 VDC(Stage2)

Design:4550765/86TPS54425PWPR

VinMin =11.5VVinMax =12.5VVout =3.3VIout =1.0ADevice=TPS54425PWPRTopology=BuckBOMCost=$2.21BOMCount=12TotalPd =0.21W

Stage1Stage2

PCB

PCBDCtoDC

AdministrativeContent

ResponsibilitiesYoussefOjeil Michael Cuervo Sahin Okur MD. Rahaman

Android Application Power Supply Microcontroller PowerMeter

RFID PCB Design Wi-Fi Communication Relay

FacilitiesandEquipment• UniversityofCentralFlorida(UCF)SmartLab

• UCFSeniorDesignLab

• TexasInstrumentsInnovationLab

• Three-phasepoweroutletfoundinEngineering1,Room456

BudgetPart Supplier Quantity CostCC3200LaunchPad Texas Instruments 1 $29.99*TRF7970ABoosterPack Texas Instruments 2 $25.00*CC3100BoosterPack Texas Instruments 2 $19.99*EVM430-F6779 Texas Instruments 1 $299.00*SSR-75DAH Fotek 1 $10.00

Nexus4 LG 1 $80.00SeniorDesignPaper The SPOT 1 $13.00PCB OSHPark 3 $140.00

PowerSupply PCB OSHPark 6 $234.00

Miscellaneous $100.00

Total

*Partsprovided freeofchargebysponsor

Limitations• Currentlysupportsonlysinglephasemeasurements

• Noauthenticationmethodforcardpayments

• UsermustbeconnectedtoWi-Finetworktoaccessdata

• SystemdoesnotsupportallmodesofNFC

• MobileAppdoesnotsupportofficialmerchant/buyersystem.CanfurtherbeimprovedbyusingAndroidPayAPIs.

Questions?