appendix a – diagrams - course website directory附录a–图-课程网站目录

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1、APPENDIXA–DIAGRAMSThefirsttwodiagrams,FigureA.1andFigureA.2,arethefinaloverallblockdiagramsforthetransmittercircuitandreceivercircuitrespectively.Eachblockdesignatesacircuitmodulewhichwasdesigned,built,andtestedindependentlyandthenintegratedtogethertocreatethefinalsystem.Thethirddiagram,FigureA.3,

2、isaflowdiagramoftheassemblycodethatmakesupthePICmicrocontrollersubmodule.Itshouldbenotedthattheultrasoundsensorblockcouldbebrokendownevenfurtherintoanultrasonictransmitterandreceiversubblock.FigureA.1TransmitterCircuitBlockDiagramFigureA.2ReceiverCircuitBlockDiagram16FigureA.3PICMicrocontrollerFlo

3、wDiagram16APPENDIXB–SCHEMATICSThecircuitschematicsthatencompasstheentiresystemareshowninFiguresB.1throughB.7.Itshouldbenotedthatthe20MHzcrystaloscillatorshowninFigureB.6isthesameoscillatorshowninFigureB.7andistheonlypartthatisshowninmultiplefigures.Theonlypartthatisnotdepictedintheseschematicsisth

4、eAD621instrumentationamplifierwhichstandsalonebeforetheband-passfilterandisconnectedtothebiceps.FigureB.1EMGBand-passFilterSchematicFigureB.2ClockCircuittoOutput245Hz16FigureB.3Encoder/RFTransmitterCircuitFigureB.4RFReceiver/DecoderCircuitFigureB.5UltrasonicTransmitterCircuit16FigureB.6UltrasonicR

5、eceiverCircuitFigureB.7PICMicrocontrollerSchematic16FigureB.8Active2ndOrderButterworthLow-PassFilterFigureB.9Active2ndOrderButterworthHigh-PassFilter16APPENDIXC–VEHICLELAYOUTFigureC.1depictstheoldECE249carwhichweusedasourvehicletocontrol.Thecartakesdigitalinputstocontrolspeedanddirectionforaleftan

6、drightmotor.Thecarrunsoffoftwo20VNi-Cdbatteriesandoutputs+5Vtotheprotoboardonthecar.FigureC.1GeneralVehicleLayout16APPENDIXD–TESTDATAFigureD.1EMGBand-PassFilterFrequencyResponseFigureD.2FilteredEMGSignal16FigureD.3EncodedandTransmittedSignalSeenByRFReceiverat60ftThisisthenoisecapturedbypointingthe

7、ultrasoundtransmitterandreceivertowardanemptyspot.Thepeaktopeakmagnitudeofthisnoiseisabout3V.FigureD.4UltrasoundTransmittedNoise16Thisisthesignalreceivedwhentheultrasoundtransmitterandreceiverarepointingtoanobjec