Heart Savers
Mid-Semester Demo
Chris Hoffman
Ryan Kellogg
Mike Zizza
February 28, 2007
http://www.ece.cmu.edu/~ece549/spring07/team5/
Project Concept
 Now
– Doctor's office or hospital - short visit
– Holter monitor - continuous home monitoring
 Asymptomatic – Don’t know when having a problem
 Later
– Wearable ECG monitor that fits into daily life
 Using 3 electrodes instead of 12
– Detect arrhythmia (irregular, faster, or slower)
– Patients of all types
System architecture
Status Update

Accomplished
– Acquired parts
– Made parts talk
– Set up development environment
– Prototyping acquisition circuitry

Risks mitigated
– Moved toward accurate data acquisition
– Worked out communication between Gumstix and Robostix through I2C

Assumptions
– Circuit will work
– Communication with phone isn’t tough
– Algorithms can be constructed to adequately process signal
Eye Candy
Demo Scenario
Console
Robostix
Gumstix
(Filtered)
signal from
body
Data/communication over
I2C
Data/comunication over
Bluetooth
Next steps

Complete acquisition/filtering circuitry (with optoisolation)

Work out communication with phone

Measure latency to determine time available for
processing signal

Do basic processing of signal – ex: heart rate detection

More advanced processing – ex: arrhythmia detection

Develop phone GUI
Software architecture
What we’ve learned

Verify your hardware ships with power supply

Opto-isolation required between electrode and
circuit

Making acquisition circuit trickier than originally
thought

Triple-check drivers work for all operating
systems used

Learned about Gumstix, Robostix, i2c, hardware
virtualization, cross-compiling

How to transfer files over serial
Tentative Schedule
Date
Milestone
March 5
•Finish circuit for 1 lead
•Risk: Unexpected circuit behavior
•Communication with phone works
March 19
•Build/test complete 3-lead circuit
•Acquire 3-lead signal and display on phone
•Understand latency contraints
April 2
•Perform basic decomposition of ECG signal
April 16
•Implement simpler processing tasks (Heart
rate detection)
•Risk: Maybe not so simple
April 30
•Implement advanced processing
•Risk: Latency issues
•Finished phone GUI and test system