Transcript final_presentation

ECE 477 Final Presentation
Group 14  Spring 2005
RAKESH
BENNY
ANUBHAV
PARICHEY
Outline
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Project overview
Block diagram
Professional components
Design components
Success criteria demonstrations
Individual contributions
Project summary
Questions / discussion
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.
Block Diagram
1
Temperature
Sensor
DS 18S20
1
RF signal
1
Heart rate
Receiver
Microcontroller
UART
RF transmitter
RF receiver
2
RS232
1
9
Boomer
Speaker
Crystalfontz
CFAH1602A-YYB-JP
Computer
Professional Components
• Constraint analysis and component selection
rationale
• Patent liability analysis
• Reliability and safety analysis
• Ethical and environmental impact analysis
Constraint Analysis
• Microcontroller
• Temperature Sensor
• Data transfer medium
Microcontroller
Microcontroller
Freescale
MC9S12C32
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
Temperature Sensor
Temperature
Sensor
Maxim
DS18S20
Interface
Single Wire
Operating Voltage
3.0 – 5.5 V
Output
9-bit Digital resolution
Table 2
Data transfer medium
Medium
Radio Frequency
Linx Technologies
LC 433 TXM/RXM
Frequency
433 MHz
Setup
Transmitter/Receiver components
available
Price
Affordable
Table 3
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
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
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
Reliability/Safety Analysis
Table 4
Reliability/Safety Analysis
Ethical Analysis
• Challenges
– Reliability
– Durability
– Instructions
• Resolution
– Data encryption and error checking
– Extensive testing
– Warning labels
Environmental Analysis
• Challenges
– Board fabrication
– Recycling
• Resolution
– Lead-free solder
– Recycling/Disposal instructions
Design Components
• Packaging design considerations
• Schematic design considerations
• PCB layout design considerations
• Software design considerations
Packaging Design
Product illustration
Packaging Design
Final Product
Packaging Design
• Similar products
CPOD NASA
LifeSync Wireless ECG
Schematic Design
9S12C32 MCU Schematic
Schematic Design
RF Transmitter with Embedded Antenna
Schematic Design
Heart beat receiver circuit with LM393N Comparator
Schematic Design
Boomer/Amplifier Schematic
Schematic Design
Linear Regulator Schematic
PCB Layout Design
TOP LAYER
PCB Layout Design
BOTTOM LAYER
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
Software Design
Start
Main Initialization
Get heart rate
sensor input
No
Pulse?
Yes
Start timer
Get heart rate
sensor input
No
Send data via RF
Display data on LCD
Pulse?
Yes
Calculate heart rate
Turn buzzer off
No
Get temperature
value
Emergenc
y?
Yes
Sound buzzer
Software Design
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Main
Heart Rate Monitor
Temperature Monitor
RF Transmission
LCD Display
Emergency Detection
Success Criteria
Demonstrations
Individual Contributions
• Team Member 1– Anubhav Arya
• Team Member 2 – Benny Wong
• Team Member 3 – Parichey Gandhi
• Team Member 4 – Rakesh Bhatia
Member 1 - Anubhav Arya
• Documentation
- Design Constraint
Analysis
- Circuit Design &
Theory of Operation
• Hardware
- PCB population
- Packaging
• Software
- LCD Display
Member 2 – Benny Wong
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Documentation
– Ethical/Environmental Analysis
– Software Analysis
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Hardware
– Component selection
– Board population (RF receiver)
– Testing and debugging
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Software
– Heart Rate Sensor
– Emergency Detection
– RF transmission
– Overall functionality
– Webmaster
Member 3 – Parichey Gandhi
• Documentation
– PCB layout design
– Patent Liability Analysis
• Hardware
– Layout Footprints and
Placement of parts
– Packaging Design
• Software
– Temperature Sensor
– Speaker
Member 4 – Rakesh Bhatia
• Documentation
– Packaging Specifications
and Design
– Reliability and Safety
analysis
• Hardware
– PCB population
– Packaging design
• Software
– LCD display
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
Project Summary
• Second iteration enhancements
– PCB dimensions could have been smaller
– Better Packaging
– Additional features
• Blood pressure
• Maintaining a health history of the patient
Questions / Discussion