presentation for ensc 440/305 instructors: patrick leung, steve whitmore department of engineering...
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Presentation for ENSC 440/305
Instructors: Patrick Leung, Steve Whitmore
Department of Engineering Science
Simon Fraser University
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Outline
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Introduction System Features System Development Scheduling Cost Potential Market Problems Encountered Future Extensions
Copyright © 2008 Corazon Engineering Inc.
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Motivation
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36% of all death in U.S. are caused by cardiovascular diseases in 2007
American Heart Association
Physicians cannot effectively predict heart attacStudy conducted by Dr. Lewis Kuller
“Heart rate itself does not completely reflect the state of the health of the heart, without knowing what the person is doing.”
Dr. William New, Stanford University
Copyright © 2008 Corazon Engineering Inc.
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Existing Heart Rate Monitoring System
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Most devices monitors heart rate only Do not know the activity associated with heart
rate Lack of mobility for medical equipments
Copyright © 2008 Corazon Engineering Inc.
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Our Solution
Heart rate with their associated activity Non-invasive and mobile Monitoring result is transferable to medical professionals Affordable
Copyright © 2008 Corazon Engineering Inc.
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Corazon Engineering Inc.
Why we name ourselves Corazon? -Corazon means “Heart” in Spanish.
Our Mission Statement - Applying the cutting-edge technology to develop innovative
products on preventing heart related disease.
Copyright © 2008 Corazon Engineering Inc.
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Company Profile
Benny Hung
[CEO]
Mike Mao
[CFO]
Thomas Cho
[CTO]
Philip Lin
[VP
of
Engineering]
Copyright © 2008 Corazon Engineering Inc.
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System Overview
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Heart Rate Sensor
MotionSensor
MicrocontrollerUnit
Symbian Application
BluetoothModule
Nokia N 73Display
D
D C
D DD
C - Control
D - Data
Copyright © 2008 Corazon Engineering Inc.
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Heart Rate Sensor Module
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General ECG Properties Design Consideration Sensor Performance
Copyright © 2008 Corazon Engineering Inc.
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General ECG Properties
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ECG Signal Bandwidth: 0.5 Hz ~ 100 Hz
ECG Signal Amplitude : ~ 1mV
Copyright © 2008 Corazon Engineering Inc.
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Design Consideration
Proper filters to extract the heart beat information
Suitable amplifiers to provide signal for MCU to calculate heart rate
Copyright © 2008 Corazon Engineering Inc.
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Design Overview
Low Pass Filter
40 KHz
InstrumentationAmplifier
Low Pass Filter
100 Hz
Notch Filter60 Hz
ArtifactRemover
Output Amplifier
ECG SignalInput
PulseOutput
Copyright © 2008 Corazon Engineering Inc.
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Filter Performance
100Hz Low Pass Filter
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60Hz Notch Filter
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Motion Sensor Module
MEMS based accelerometer
3-Axis output
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Functionality
G-forces table
Set threshold at boundary
Copyright © 2008 Corazon Engineering Inc.
G Force Analog Value
- 1 1.00 V
0 1.70 V
1 2.30 V
G Force Analog Value
0.5 2.00 V
-0.5 1.22 V
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Microcontroller
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I/O Connections Heart rate detection Position/Motion detection
Copyright © 2008 Corazon Engineering Inc.
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I/0 Connections
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ADC
Timer input capture
UART
Copyright © 2008 Corazon Engineering Inc.
Motion sensor Heart rate Bluetooth
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Position/Motion Detection
1
1.2
1.4
1.6
1.8
2
2.2
2.4
0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000
Stationary
Average
1
1.2
1.4
1.6
1.8
2
2.2
2.4
0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000
Moving
Average
Average 1.78Variance 0.025
Average 1.76Variance 0.19
Copyright © 2008 Corazon Engineering Inc.
Stationary
Moving
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Implementation in MCU
Human motion limitation at 4 Hz Sampling at 10 Hz Average of data for static position Variance of data for motion level
Copyright © 2008 Corazon Engineering Inc.
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Firmware Flow Chart
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Start
Initialization
Pulse Captured?
Timer Time Out?
Enable Interrupt
Error HandlingCalculate
Heart RateUpdate
Heart Rate
Add New SamplesTo Motion Buffer
Position/Motion
Detection
Buffer OV
TransmitData to BlueTooth
No
Yes
Yes Yes
No
No
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Symbian Application
Bluetooth client User interface for our system Logs data into text file
112/04/19 28Copyright © 2008 Corazon Engineering Inc.
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Application State Diagram
Copyright © 2008 Corazon Engineering Inc.
Getting Service
Getting Connection
Getting Device
DisplayError
Connected Receive
Disconnect
Idle
Bluetooth Connect Initiated
HRMMS DeviceSelected
No Bluetooth Device Found
No Service Found/Firmware Error
Phone Found HRMMS Service
Cannot Establish Connection
Connection Establish
Check For Incoming Data
No Incoming Data
Disconnect Initiated Disconnect Initiated
Received Incoming DataNo Command
Return to Idle
Return to Idle
User Chose to Research Device
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Initialize Schedule VS. Actual Progress
Copyright © 2008 Corazon Engineering Inc.
Initialize Schedule
Actual Progress
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Cost Comparison
Miscellaneous Include: connector head, power switch, LED and Labeling
Components Budget Cost Implementation Cost
Accelerometer 10.00 20.00
ADC 20.00 -
Battery Power System 20.00 10.00
Bluetooth Module 50.00 97.00
Cables 20.00 5.00
Case 20.00 10.00
Electrode 20.00 8.85
Heart Rate Monitor Module 80.00 38.00
Microcontroller 100.00 60.00
PCB 10.00 -
Miscellaneous 50.00 50.00
PCB Fabrication from Hong Kong - 400.00
Total Cost 400.00 698.85
Copyright © 2008 Corazon Engineering Inc.
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Personal Health Monitoring Elderly Home Monitoring Heart Rehabilitation Program Military and Rescue Personnel Use Athletic Performance Training
Potential Market
Copyright © 2008 Corazon Engineering Inc.
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Problems Encountered
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Signal artifacts caused by electrode contact Initial motion sensors broke during testing Homemade PCBs did not turn out well Microcontroller register not set properly Symbian application installation problems due to
IDE versioning
Copyright © 2008 Corazon Engineering Inc.
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Future Extensions
39
Wireless Sensor Additional static positions detection Specific motion detection Port our phone application to other platform Variety of Bio-Sensors for other health monitoring
Copyright © 2008 Corazon Engineering Inc.
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Our Feelings
Copyright © 2008 Corazon Engineering Inc.
Benny Hung – “A milestone for all knowledge I have learned in the past five years as a undergraduate student”
Mike Mao – “A great overall engineering experience, from initial design to the completion of prototype device”
Thomas Cho –“A great opportunity for me to learn more about Symbian programming”
Philip Lin – “Amazing team work experience and a good opportunity to apply all the hardware knowledge learned throughout my undergraduate studies”
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