prepaid energy system
TRANSCRIPT
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?