prepaid energy system

Prepaid Energy System

Group 21

GroupMembers

• Sahin Okur – ElectricalEngineering• YoussefOjeil – ElectricalEngineering• MichaelCuervo– ElectricalEngineering• MD.S.Rahaman – ElectricalEngineering• Dr.Chung-YongChan– Supervisor

Sponsorship

Objective

• AlternativetoconventionalUtilityBilling• SimpleUserfriendlyInterface• MonitoringandRegulatingEnergyusage• Benefitforboththeconsumerandprovider

SystemSpecifications

• ValidateuserviaRFID• Acceptpaymentgreaterthan0USdollarsviaRFID• Replenishcreditoncepaymentiscomplete• Displaybalancewith1secondofactivation• SenddifferenttypesofdatathroughWi-Fi• Desireddimensions15x11sq.inches• Systemshouldoperateintemperaturesfrom100degreesto-40Celsius

ProjectOverview

EVM430-F6779- 3PhaseElectronicPowerMeter

• Runreal-timeelectricitymeteringapplications• Metrologysoftwareprovided• ConnectstoanytestsystemorACvoltage• Capacitiveandisolatedpowersuppliespresent• EasyviewingofresultsandcalibrationviaRS-232• 160segmentLCDdisplay• RFconnectorsforAMR/AMIsupport• 32kHzRTCsupport(headeravailableforRTCcalibration)• HeadersforpoweringMSP430orRTC-onlyviaauxiliarypowersources

EVM430-F6779- 3PhaseElectronicPowerMeter

Input

Inputvoltagesandneutral Inputcurrents

SinglePhaseConnection

SolidStaee Relay

• Loadcurrent75A

Input:

• InputDCcontrol3-32V

• Triggercurrent7.5mA/12V

Output:

• Operatingvoltage90-480V

Weight:

125g

ComparatorTL084

• MCUOutputvoltage3.3

• Risethevoltageto12V.

• Usingasalogiccircuiteither0to12voltoutput.

ComparatorLogiccircuit

@3.3Vinputoutputlessthan0 @0Vinputoutput12V

Continue

Input Output

3.3 0

0 12

EnergyCalculation• Every6400plusesequivalentto1KWH

RFID

• ChoseNFCsincenearfieldismoresecure.• Operatesat13.56MHz• ContainstwoseparatepartstheHostandtheTag

NFCreaderSelection

TRF7970A TRF7964A

Standard ISO 14443A ISO 14443B JIS X 6319-4 ISO 15693 ISO 18000-3

ISO 14443A ISO 14443B JIS X 6319-4 ISO 15693 ISO 18000-3

FIFO(bytes) 12 127

SupplyVoltage(V) 2.7-5.5 2.7- 5.5

PowerDown(uA) 0.5 0.5

StandBy(mA) 2 2

Cost$

TRF7970AChipFeatures

• CompletelyIntegratedProtocolHandlingforISO15693,ISO18000-3,ISO14443A,ISO14443B,NFCForumDeviceTypes1to4,andFeliCa

• InputVoltageRange:2.7VDCto5.5VDC• ProgrammableOutputPower:+20dBm (100mW)or+23dBm (200mW)

• ProgrammableI/OVoltageLevels:1.8VDCto5.5VDC

TRF7960AMulti-ProtocolFullyIntegrated13.56-MHzRFIDReader/WriterIC

NFC&MCUBlockDiagram

PhoneSelection

• Nexus S&Nexus4• NexusSwasinitiallyusedbecauseitwascheap• Nexus4usedbecauseofAndroid4.4• BroadcomNFCchip• Android4.4wasminimumforHostcardemulationmethod

NFCtag

• Differenttags

NFCmodes

• Cardem• P2P• reader/writer

AndroidApplication

• Login• UserInterface• Mobileappwillhavealertsystem• EmulatingatranspondertagusingHCE• RetrieveDatathroughWi-Fi

PowerSupplyDesign

• 120VoltACinput• 3.3VoltDCoutput• 2Rails

a.Relay12VoltsDCb.MicrocontrollerandPeripherals3.3VoltsDC

PowerSupplyDesign

120Vacto12Vdc(Stage1)

12Vdcto3.3Vdc(Stage2)

AdministrativeYoussefOjeil Michael Cuervo Sahin Okur MD. Rahaman

Primary Android Application Power Supply Microcontroller PowerMeter

RFiD PCB Design Wi-Fi Communication Relay

AdministrativeContent

Secondary

QUESTIONS?