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SeniorProjectFinalReport:DirectTirePressure& TemperatureSystem DesignTeam2 WilliamR.Adkins RichardBraun Chun-TeLu MingjianSi FacultyAdvisor Dr.NathanIda April28,2003 0 TableofContents ListofFigures2 ListofTables3 ListofAcronyms4 Abstract5 Introduction6 DesignSpecifications8 AcceptedTechnicalDesign11 WheelSegment18 Codefor12C67123 CarSegment30 Codefor16F87738 TestingProcedures54 FinancialBudget59 ProjectSchedule62 Fall200263 Spring200364 DesignTeamContactInformation65 Conclusions66 AppendixA69 AppendixB74 1 ListofFigures Figure1:SensorSignalFlowChart12 Schematic1:WheelSegment13 Schematic2:CarSegment14 Picture1:SensorConnectiontoWheel18 Picture2.BoxhousingallC/Scomponents30 Picture3:in-carinstallation,fromdistance.57 Picture4:in-carinstallationsystemoff.58 Picture5:Wireconnectionstocar59 Figure2:Microcontroller(u2)CodeFlowChart52 Figure3:Microcontroller(u2)DiagnosticFlowChart53 ProjectScheduleFall200263 ProjectScheduleSpring200364 2 ListofTables Table1:ReferenceDesignatorsforSchematic15 Table2:PinConnectionsforu1,theMicrochip12C76121 Table3:W/Scodefunctionsandvariables22 Table4:PinConnectionsfortx1,RadiometrixTX2-433-40-3V27 Table5:PowerBudgetforWheelSystem28 Table6:Pinconnectionsforrx1,RadiometrixRX2-433-40-5V31 Table7:Pinconnectionsforu2,MicrochipPIC16F877A34 Table8:PinConnectionsforLCD1:CN1,35 Table9:C/Scodefunctionsandvariables35 Table10:WorkBudget59 Table11:MaterialCost60 3 ListofAcronyms CarSegmentC/S CommunicationsSegmentComm/S DisplaySegmentD/S ReceiverSegmentRx/S SensorSegmentS/S TransmitterSegmentTx/S WheelSegmentW/S 4 Abstract Incorrecttireinflationandhightiresurfacetemperaturesarehazardstothesafety toallthosetravelingthehighways.Tocombatthisproblem,thedesignteamplansto buildasystemthatwillmonitorthepressureandtemperatureofanautomobiletire.After doingconsiderableresearch,theteamhasdeterminedthefollowingto