ECE 477 Final Presentation Group 14  Spring 2005

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

2. Outline • Project overview • Block diagram • Professional components • Design components • Success criteria demonstrations • Individual contributions • Project summary • Questions / discussion

3. Project Overview • State-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.

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

5. Professional Components • Constraint analysis and component selection rationale • Patent liability analysis • Reliability and safety analysis • Ethical and environmental impact analysis

6. Constraint Analysis • Microcontroller • Temperature Sensor • Data transfer medium

7. Microcontroller Table 1

8. Temperature Sensor Table 2

9. Data transfer medium 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 #4,270,547 • Vital signs monitoring system • Infringements • 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 reliable • Components Analyzed • Microcontroller – MC9S12C32 • Receiver and Transmitter • Character LCD display • DS18S20 Temperature sensor • Linear regulator • The microcontroller was found most likely to fail with MTTF = 105263 hrs

13. Reliability/Safety Analysis Table 4

14. Reliability/Safety Analysis

15. Ethical Analysis • Challenges • Reliability • Durability • Instructions • Resolution • Data encryption and error checking • Extensive testing • Warning labels

16. Environmental Analysis • Challenges • Board fabrication • Recycling • Resolution • Lead-free solder • Recycling/Disposal instructions

17. Design Components • Packaging design considerations • Schematic design considerations • PCB layout design considerations • Software design considerations

18. Packaging Design Product illustration

19. Packaging Design Final Product

20. Packaging Design • Similar products 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. PCB Layout Design BOTTOM LAYER

28. PCB Design Constraints • Placement of RF transmitter and the antenna far from the oscillator to reduce EMI • Avoid 90o angle traces to reduce capacitance • Use 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 circuit • Minimize the number of VIAS

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

30. Software Design • Main • Heart Rate Monitor • Temperature Monitor • RF Transmission • LCD Display • Emergency Detection

31. Success Criteria Demonstrations

32. Individual Contributions • Team Member 1– Anubhav Arya • Team Member 2 – Benny Wong • Team Member 3 – Parichey Gandhi • Team Member 4 – Rakesh Bhatia

33. Member 1 - Anubhav Arya • Documentation - Design Constraint Analysis - Circuit Design & Theory of Operation • Hardware - PCB population - Packaging • Software - LCD Display

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

35. Member 3 – Parichey Gandhi • Documentation • PCB layout design • Patent Liability Analysis • Hardware • Layout Footprints and Placement of parts • Packaging Design • Software • Temperature Sensor • Speaker

36. Member 4 – Rakesh Bhatia • Documentation • Packaging Specifications and Design • Reliability and Safety analysis • Hardware • PCB population • Packaging design • Software • LCD display

37. Project Summary • Important 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

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

39. Questions / Discussion