Wireless Sensor NetworkSlide 2Wireless Sensor NetworksFeaturesObjectiveHardwarePrototype RedesignSlide 8VCO TuningCorrected VCOSlide 11PCB V1 Design IssuesPCB IssuesPackage (Rev 01)How We addressed each pcb issue maybe we can combine this slide with slide 12 someway I don’t think a table.Slide 16PCB Rev2Size Reduction (PCB)PCB Design IssuesTransmission DistanceSensor InterfaceSoftwareTinyOSNESCSlide 25DELETE Communication System Block Diagram (TX/RX Chain)NetworkNetworking AlgorithmMedium Access ControlChannel CodingTestingDesign ConstraintsPrototype SpectrumPCB V2 SpectrumSlide 35Updated CostSlide 37Size ReductionSizeSlide 40Slide 41Slide 42Indoor packageThroughput ComparisonBERSummaryFuture WorkAcknowledgementsQuestionsTransmission Distance: Prototype Vs. Final PackagePower Consumption: Prototype Vs. Final PackagePCB LayoutAnalysis of RF CircuitSlide 54Slide 55Wireless Sensor NetworkWireless Sensor NetworkMicrocontroller Microcontroller InterfaceInterfacePorting TinyOSPorting TinyOSApplication DesignApplication DesignWebpage DesignWebpage DesignDeliverablesDeliverablesLeaderLeaderKennabecKennabecWalpWalpPower SupplyPower SupplyDC to DC DC to DC ConverterConverterResearchResearchMeeting MinutesMeeting MinutesDeliverablesDeliverablesMichael Michael MiddletonMiddletonPower Supply Power Supply Communications Communications SimulationSimulationResearch Research Meeting MinutesMeeting MinutesDeliverablesDeliverablesKelly Kelly LancasterLancasterSensor & Sensor & Antenna InterfaceAntenna InterfaceTiny OSTiny OSSimulationSimulationResearchResearchMicrosoft ProjectMicrosoft ProjectDeliverablesDeliverablesThomasThomasButlerButlerHardware Design &TestingHardware Design &TestingSoftware / Firmware Design & Software / Firmware Design & TestingTestingDocumentationDocumentation Team MembersTeam MembersDr. LazarouDr. LazarouAdvisorAdvisorJan BaranskiJan BaranskiIndustrial AdvisorIndustrial AdvisorSteve GivenSteve GivenIndustrial AdvisorIndustrial AdvisorWireless Sensor NetworksWireless Sensor NetworksConsist of many small, reliable, and Consist of many small, reliable, and efficient remote sensors (“motes”)efficient remote sensors (“motes”)Communicate with other sensor modules Communicate with other sensor modules over a self-configuring ad hoc networkover a self-configuring ad hoc network Base StationFeaturesFeaturesTinyOSTinyOS““Unprecedented Communications and Processing”Unprecedented Communications and Processing”††6 Mo. Battery Life6 Mo. Battery Life2-1.5V AA Batteries2-1.5V AA BatteriesSelf-Organizing NetworkSelf-Organizing NetworkVarious Sensing CapabilitiesVarious Sensing CapabilitiesLight, Temperature, Barometric Pressure, Acceleration, Light, Temperature, Barometric Pressure, Acceleration, Acoustic, Magnetic, etc.Acoustic, Magnetic, etc.† † University of California at BerkeleyUniversity of California at BerkeleyObjectiveObjectiveTo design a digital wireless communication To design a digital wireless communication systemsystemEmphasis on power efficiencyEmphasis on power efficiencyTo pursue a full understanding of the state To pursue a full understanding of the state of the art in WSN technologyof the art in WSN technologyEnhance the state of the art in WSN’sEnhance the state of the art in WSN’sSpearhead WSN research at Mississippi State Spearhead WSN research at Mississippi State UniversityUniversityHardwareHardwarePrototype RedesignPrototype RedesignAdjusting L affects the center frequencyVCO TuningVCO TuningVCO Tank Inductor affected the operating VCO Tank Inductor affected the operating frequencyfrequency____f = 1 / (2π√LC)Corrected VCOCorrected VCOPCB RedesignPCB RedesignPCB V1 Design IssuesPCB V1 Design IssuesPCB LayoutPCB LayoutLong Trace LengthsLong Trace LengthsCorners & EdgesCorners & EdgesParasitic InductanceParasitic InductanceInexperienceInexperienceDecoupling CapsDecoupling CapsCC1010CC1010.5mm pin pitch very difficult to work with..5mm pin pitch very difficult to work with.Must be careful not to induce parasitic capacitance with Must be careful not to induce parasitic capacitance with long, closely spaced traces.long, closely spaced traces.I think we need to talk about the affect that the Power supply had on V1. Maybe mention crosstalk.And the danger of combining digital and analog if Kennabec Is comfortable.PCB IssuesPCB IssuesI think we need to compare and contrast pictures with V1 and V2 and show what we changed. It would be Awesome if we could get them both on the same slide. And Somebody with a steady hand should erase that tacky whiteLine on the side of the picture in paint or something.Package (Rev 01)Package (Rev 01)How We addressed each pcb issue How We addressed each pcb issue maybe we can combine this slide maybe we can combine this slide with slide 12 someway I don’t think with slide 12 someway I don’t think a table.a table.Reasons for going to 4 layer boardReasons for going to 4 layer boardWidening tracesWidening tracesGround PlaneGround PlaneShortening TracesShortening TracesImpedance Matching(Software)Impedance Matching(Software)PCB Rev2PCB Rev2Size Reduction (PCB)Size Reduction (PCB)V1 PCB is 3.00” X 2.75”V1 PCB is 3.00” X 2.75”Our current PCB is 3.00” X 2.00”Our current PCB is 3.00” X 2.00”Eliminated unused I/O pins and their Eliminated unused I/O pins and their respective components.respective components.Designed 4 Layer Board creating more Designed 4 Layer Board creating more size efficient routingsize efficient routingPCB Design IssuesPCB Design IssuesTransmission DistanceTransmission DistanceReceiver Sensitivity: -102 dBmReceiver Sensitivity: -102 dBmAttenuation = ((4Attenuation = ((4ππ*d)/*d)/λλ))22 =2.749*10 =2.749*1066Attenuation = 10log(2.749*10Attenuation = 10log(2.749*1066)+30 = 94.4 dBm)+30 = 94.4 dBmPPtranstrans = Attenuation + P = Attenuation + Prec,minrec,min = 94.4-102= = 94.4-102= --7.6 dBm7.6 dBmPA_POW = 0x07PA_POW = 0x07d = 300 ft.d = 300 ft.TransmitTransmitReceiveReceiveSensor InterfaceSensor InterfaceExternal sensor External sensor module plugs into module plugs into each mote.each mote.14 Pin Connector14 Pin Connector8 Digital I/O8 Digital I/O2 Analog I/O2 Analog I/O2 GND2 GND2 PWR2 PWRSoftwareSoftwareTinyOSTinyOSOpen Source Modular Runtime Open Source Modular Runtime EnvironmentEnvironmentDesigned for Embedded SystemsDesigned for Embedded
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