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ECE 477 Final Presentation Group 14 Spring 2005. RAKESH. BENNY. ANUBHAV. PARICHEY. Outline. Project overview Block diagram Professional components Design components Success criteria demonstrations Individual contributions Project summary Questions / discussion. Project Overview. - PowerPoint PPT Presentation
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ECE 477 Final Presentation ECE 477 Final Presentation Group 14 Group 14 Spring 2005 Spring 2005
BENNYBENNY
PARICHEYPARICHEY
RAKESHRAKESH
ANUBHAVANUBHAV
OutlineOutline
• Project overviewProject overview• Block diagramBlock diagram• Professional componentsProfessional components• Design componentsDesign components• Success criteria demonstrationsSuccess criteria demonstrations• Individual contributionsIndividual contributions• Project summaryProject summary• Questions / discussionQuestions / discussion
Project OverviewProject Overview
• State-of-the-art system allowing doctors to monitor patientsState-of-the-art system allowing doctors to monitor patientsbody temperature and heart rate.body temperature and heart rate.
– Device clipped to the patient. Heart rate and temperature are Device clipped to the patient. Heart rate and temperature are measured by the sensors present in the device.measured by the sensors present in the device.
– Measured data sent to the Computer via RF.Measured data sent to the Computer via RF.
– Doctors and nurses are warned through the computer and Doctors and nurses are warned through the computer and the people present around the patient are warned through a the people present around the patient are warned through a speaker if heart rate and temperature exceed threshold.speaker if heart rate and temperature exceed threshold.
– Heart rate and body temperature are Heart rate and body temperature are constantly displayed on the LCD.constantly displayed on the LCD.
Block DiagramBlock Diagram
Microcontroller RF transmitter
TemperatureSensor
DS 18S20
Heart rateReceiver
UART
Computer
Crystalfontz Crystalfontz CFAH1602A-YYB-JP
Boomer
1
1
9
1
RF signal
RF receiver
RS232
2
1
SpeakerSpeaker
Professional ComponentsProfessional Components
• Constraint analysis and component selection Constraint analysis and component selection rationalerationale
• Patent liability analysisPatent liability analysis
• Reliability and safety analysisReliability and safety analysis
• Ethical and environmental impact analysisEthical and environmental impact analysis
Constraint AnalysisConstraint Analysis
• MicrocontrollerMicrocontroller
• Temperature SensorTemperature Sensor
• Data transfer mediumData transfer medium
MicrocontrollerMicrocontrollerMicrocontrollerMicrocontroller FreescaleFreescale
MC9S12C32MC9S12C32MemoryMemory 32k Flash32k Flash
1k SRAM1k SRAM
PeripheralsPeripherals Timer, ATD, UART, PWMTimer, ATD, UART, PWM
Operating VoltagesOperating Voltages 3.3 – 5.0 V3.3 – 5.0 V
Clock SpeedsClock Speeds 0.5 – 40 Mhz0.5 – 40 Mhz
(Pierce Oscillator)(Pierce Oscillator)
PricePrice Samples available along Samples available along with Evaluation/Demo with Evaluation/Demo
BoardBoard
FamiliarityFamiliarity Familiar MCU through 362 Familiar MCU through 362
Table 1Table 1
Temperature SensorTemperature Sensor
Temperature Temperature SensorSensor
MaximMaxim
DS18S20DS18S20
InterfaceInterface Single WireSingle Wire
Operating VoltageOperating Voltage 3.0 – 5.5 V3.0 – 5.5 V
OutputOutput 9-bit Digital resolution9-bit Digital resolution
Table 2Table 2
Data transfer mediumData transfer mediumMediumMedium Radio FrequencyRadio Frequency
Linx TechnologiesLinx Technologies
LC 433 TXM/RXMLC 433 TXM/RXMFrequency Frequency 433 MHz433 MHz
SetupSetup Transmitter/Receiver components Transmitter/Receiver components availableavailable
Price Price AffordableAffordable
Table 3Table 3
Patent Liability AnalysisPatent Liability Analysis
• Patent #6,102,856
– Wearable vital sign monitoring system
• Infringements– Wireless Technology to transfer vital health
information to a Remote PC. - GPS• Solutions
– Use of RF as mode of wireless communication
Patent Liability AnalysisPatent Liability Analysis
• Patent #4,270,547Patent #4,270,547
– Vital signs monitoring systemVital signs monitoring system
• InfringementsInfringements– Portable device incorporated into handheld Portable device incorporated into handheld
casecase
SolutionsSolutions– Portable device designed to Portable device designed to
be worn on waist beltbe worn on waist belt
Reliability/Safety AnalysisReliability/Safety Analysis
• Motivation- Create a product safe for the user to use and also Motivation- Create a product safe for the user to use and also reliablereliable
• Components AnalyzedComponents Analyzed– Microcontroller – MC9S12C32 Microcontroller – MC9S12C32 – Receiver and TransmitterReceiver and Transmitter– Character LCD display Character LCD display – DS18S20 Temperature sensor DS18S20 Temperature sensor – Linear regulatorLinear regulator
• The microcontroller was found most likely to fail with The microcontroller was found most likely to fail with MTTF = 105263 hrsMTTF = 105263 hrs
Reliability/Safety AnalysisReliability/Safety Analysis
Table 4Table 4
Reliability/Safety AnalysisReliability/Safety Analysis
Ethical AnalysisEthical Analysis
• ChallengesChallenges– ReliabilityReliability– DurabilityDurability– InstructionsInstructions
• ResolutionResolution– Data encryption and error checkingData encryption and error checking– Extensive testingExtensive testing– Warning labelsWarning labels
Environmental AnalysisEnvironmental Analysis
• ChallengesChallenges– Board fabricationBoard fabrication– RecyclingRecycling
• ResolutionResolution– Lead-free solderLead-free solder– Recycling/Disposal instructionsRecycling/Disposal instructions
Design ComponentsDesign Components
• Packaging design considerationsPackaging design considerations
• Schematic design considerationsSchematic design considerations
• PCB layout design considerationsPCB layout design considerations
• Software design considerationsSoftware design considerations
Packaging DesignPackaging Design
Product illustration Product illustration
Packaging DesignPackaging Design
Final Product Final Product
Packaging DesignPackaging Design• Similar productsSimilar products
CPOD NASA LifeSync Wireless ECGCPOD NASA LifeSync Wireless ECG
Schematic DesignSchematic Design
9S12C32 MCU Schematic
Schematic DesignSchematic Design
RF Transmitter with Embedded Antenna
Schematic DesignSchematic Design
Heart beat receiver circuit with LM393N Comparator
Schematic DesignSchematic Design
Boomer/Amplifier Schematic
Schematic DesignSchematic Design
Linear Regulator Schematic
PCB Layout DesignPCB Layout Design
TOP LAYERTOP LAYER
BOTTOM LAYERBOTTOM LAYER
PCB Layout DesignPCB Layout Design
PCB Design ConstraintsPCB Design Constraints
• Placement of RF transmitter and the antenna far Placement of RF transmitter and the antenna far from the oscillator to reduce EMIfrom the oscillator to reduce EMI
• Avoid 90Avoid 90oo angle traces to reduce capacitance angle traces to reduce capacitance
• Use 40 mil traces for power and ground to reduce Use 40 mil traces for power and ground to reduce heat dissipationheat dissipation
• Decoupling capacitors near the VCC pins of MCU to Decoupling capacitors near the VCC pins of MCU to reduce ripple produced in the circuitreduce ripple produced in the circuit
• Minimize the number of VIASMinimize the number of VIAS
Software DesignSoftware DesignStart
Main Initialization
Get heart rate sensor input
Pulse?No
Get temperature value
Start timer
Yes
Get heart rate sensor input
No
Calculate heart rate
Emergency?
Pulse?
Yes
Sound buzzerYes
No
Display data on LCD
Send data via RF
Turn buzzer off
Software DesignSoftware Design
• MainMain• Heart Rate MonitorHeart Rate Monitor• Temperature MonitorTemperature Monitor• RF TransmissionRF Transmission• LCD DisplayLCD Display• Emergency DetectionEmergency Detection
Success Criteria Success Criteria DemonstrationsDemonstrations
Individual ContributionsIndividual Contributions
• Team Member 1– Anubhav Arya Team Member 1– Anubhav Arya
• Team Member 2 – Benny WongTeam Member 2 – Benny Wong
• Team Member 3 – Parichey GandhiTeam Member 3 – Parichey Gandhi
• Team Member 4 – Rakesh BhatiaTeam Member 4 – Rakesh Bhatia
Member 1 - Anubhav AryaMember 1 - Anubhav Arya
• DocumentationDocumentation - Design Constraint - Design Constraint
Analysis Analysis- Circuit Design & - Circuit Design &
Theory of OperationTheory of Operation
• Hardware Hardware - PCB population- PCB population - Packaging- Packaging
• SoftwareSoftware - LCD Display- LCD Display
Member 2 – Benny WongMember 2 – Benny Wong• DocumentationDocumentation
– Ethical/Environmental AnalysisEthical/Environmental Analysis– Software AnalysisSoftware Analysis
• HardwareHardware– Component selectionComponent selection– Board population (RF receiver)Board population (RF receiver)– Testing and debuggingTesting and debugging
• SoftwareSoftware– Heart Rate SensorHeart Rate Sensor– Emergency DetectionEmergency Detection– RF transmissionRF transmission– Overall functionalityOverall functionality– WebmasterWebmaster
Member 3 – Parichey GandhiMember 3 – Parichey Gandhi
• DocumentationDocumentation– PCB layout designPCB layout design– Patent Liability AnalysisPatent Liability Analysis
• HardwareHardware– Layout Footprints and Layout Footprints and
Placement of partsPlacement of parts– Packaging DesignPackaging Design
• SoftwareSoftware– Temperature SensorTemperature Sensor– SpeakerSpeaker
Member 4 – Rakesh BhatiaMember 4 – Rakesh Bhatia
• DocumentationDocumentation– Packaging Specifications Packaging Specifications
and Design and Design – Reliability and Safety Reliability and Safety analysisanalysis
• HardwareHardware– PCB populationPCB population– Packaging designPackaging design
• SoftwareSoftware– LCD displayLCD display
Project SummaryProject Summary
• Important lessons learnedImportant lessons learned– Match your footprints before sending the layoutMatch your footprints before sending the layout
– Solder the micro-controller first and then the Solder the micro-controller first and then the headersheaders
– Ensure functionality of each component before Ensure functionality of each component before soldering the rest on the PCBsoldering the rest on the PCB
– Select micro based on the number of Select micro based on the number of I/O pins requiredI/O pins required
Project SummaryProject Summary
• Second iteration enhancementsSecond iteration enhancements– PCB dimensions could have been smallerPCB dimensions could have been smaller
– Better PackagingBetter Packaging
– Additional features Additional features • Blood pressureBlood pressure• Maintaining a health history of the patientMaintaining a health history of the patient
Questions / DiscussionQuestions / Discussion
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