1. ECE 477 Final Presentation Group 14  Spring 2005 BENNY PARICHEY RAKESH ANUBHAV

2. Outline 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

3. Project Overview State-of-the-art system allowing doctors to monitor patientsState-of-the-art system allowing doctors to monitor patients body temperature and heart rate. –Device clipped to the patient. Heart rate and temperature are measured by the sensors present in the device. –Measured data sent to the Computer via RF. –Doctors and nurses are warned through the computer and the people present around the patient are warned through a speaker if heart rate and temperature exceed threshold. –Heart rate and body temperature are constantly displayed on the LCD. constantly displayed on the LCD.

4. Block Diagram Microcontroller RF transmitter Temperature Sensor DS 18S20 Heart rate Receiver UART Computer Crystalfontz CFAH1602A-YYB-JP Boomer 1 1 9 1 RF signal RF receiver RS232 2 1 Speaker

5. Professional Components Constraint analysis and component selection rationaleConstraint analysis and component selection rationale Patent liability analysisPatent liability analysis Reliability and safety analysisReliability and safety analysis Ethical and environmental impact analysisEthical and environmental impact analysis

6. Constraint Analysis MicrocontrollerMicrocontroller Temperature SensorTemperature Sensor Data transfer mediumData transfer medium

7. Microcontroller MicrocontrollerFreescaleMC9S12C32 Memory 32k Flash 1k SRAM Peripherals Timer, ATD, UART, PWM Operating Voltages 3.3 – 5.0 V Clock Speeds 0.5 – 40 Mhz (Pierce Oscillator) Price Samples available along with Evaluation/Demo Board Familiarity Familiar MCU through 362 Table 1

8. Temperature Sensor MaximDS18S20 Interface Single Wire Operating Voltage 3.0 – 5.5 V Output 9-bit Digital resolution Table 2

9. Data transfer medium Medium Radio Frequency Linx Technologies LC 433 TXM/RXM Frequency 433 MHz Setup Transmitter/Receiver components available PriceAffordable Table 3

10. Patent 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

11. Patent Liability Analysis Patent #4,270,547Patent #4,270,547 –Vital signs monitoring system InfringementsInfringements –Portable device incorporated into handheld case Solutions –Portable device designed to be worn on waist belt

12. Reliability/Safety Analysis Motivation- Create a product safe for the user to use and also reliableMotivation- Create a product safe for the user to use and also reliable Components AnalyzedComponents Analyzed –Microcontroller – MC9S12C32 –Receiver and Transmitter –Character LCD display –DS18S20 Temperature sensor –Linear regulator The microcontroller was found most likely to fail withThe microcontroller was found most likely to fail with MTTF = 105263 hrs

13. Reliability/Safety Analysis Table 4

14. Reliability/Safety Analysis

15. Ethical Analysis ChallengesChallenges –Reliability –Durability –Instructions ResolutionResolution –Data encryption and error checking –Extensive testing –Warning labels

16. Environmental Analysis ChallengesChallenges –Board fabrication –Recycling ResolutionResolution –Lead-free solder –Recycling/Disposal instructions

17. Design Components Packaging design considerationsPackaging design considerations Schematic design considerationsSchematic design considerations PCB layout design considerationsPCB layout design considerations Software design considerationsSoftware design considerations

18. Packaging Design Product illustration

19. Packaging Design Final Product

20. Packaging Design Similar productsSimilar products CPOD NASA LifeSync Wireless ECG CPOD NASA LifeSync Wireless ECG

21. Schematic Design 9S12C32 MCU Schematic

22. Schematic Design RF Transmitter with Embedded Antenna

23. Schematic Design Heart beat receiver circuit with LM393N Comparator

24. Schematic Design Boomer/Amplifier Schematic

25. Schematic Design Linear Regulator Schematic

26. PCB Layout Design TOP LAYER

27. BOTTOM LAYER PCB Layout Design

28. PCB Design Constraints Placement of RF transmitter and the antenna far from the oscillator to reduce EMIPlacement of RF transmitter and the antenna far from the oscillator to reduce EMI Avoid 90 o angle traces to reduce capacitanceAvoid 90 o angle traces to reduce capacitance Use 40 mil traces for power and ground to reduce heat dissipationUse 40 mil traces for power and ground to reduce heat dissipation Decoupling capacitors near the VCC pins of MCU to reduce ripple produced in the circuitDecoupling capacitors near the VCC pins of MCU to reduce ripple produced in the circuit Minimize the number of VIASMinimize the number of VIAS

29. Software Design Start Main Initialization Get heart rate sensor input Pulse? No Get temperature value Start timer Yes Get heart rate sensor input No Calculate heart rate Emergenc y? Pulse? Yes Sound buzzer Yes No Display data on LCD Send data via RF Turn buzzer off

30. Software Design MainMain Heart Rate MonitorHeart Rate Monitor Temperature MonitorTemperature Monitor RF TransmissionRF Transmission LCD DisplayLCD Display Emergency DetectionEmergency Detection

31. Success Criteria Demonstrations

32. Individual Contributions Team Member 1– Anubhav AryaTeam 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

33. Member 1 - Anubhav Arya DocumentationDocumentation - Design Constraint Analysis - Design Constraint Analysis - Circuit Design & Theory of Operation Theory of Operation HardwareHardware - PCB population - PCB population - Packaging - Packaging SoftwareSoftware - LCD Display - LCD Display

34. Member 2 – Benny Wong DocumentationDocumentation –Ethical/Environmental Analysis –Software Analysis HardwareHardware –Component selection –Board population (RF receiver) –Testing and debugging SoftwareSoftware –Heart Rate Sensor –Emergency Detection –RF transmission –Overall functionality –Webmaster

35. Member 3 – Parichey Gandhi DocumentationDocumentation –PCB layout design –Patent Liability Analysis HardwareHardware –Layout Footprints and Placement of parts –Packaging Design SoftwareSoftware –Temperature Sensor –Speaker

36. Member 4 – Rakesh Bhatia DocumentationDocumentation –Packaging Specifications and Design –Reliability and Safety analysis analysis HardwareHardware –PCB population –Packaging design SoftwareSoftware –LCD display

37. Project Summary Important lessons learnedImportant lessons learned –Match your footprints before sending the layout –Solder the micro-controller first and then the headers –Ensure functionality of each component before soldering the rest on the PCB –Select micro based on the number of I/O pins required I/O pins required

38. Project Summary Second iteration enhancementsSecond iteration enhancements –PCB dimensions could have been smaller –Better Packaging –Additional features Blood pressureBlood pressure Maintaining a health history of the patientMaintaining a health history of the patient

39. Questions / Discussion