Heart Savers Mid-Semester Demo Chris Hoffman Ryan Kellogg Mike Zizza February 28,

Project Concept Now Now –Doctor's office or hospital - short visit –Holter monitor - continuous home monitoring  Asymptomatic – Don’t know when having a problem Later 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 Accomplished –Acquired parts –Made parts talk –Set up development environment –Prototyping acquisition circuitry Risks mitigated Risks mitigated –Moved toward accurate data acquisition –Worked out communication between Gumstix and Robostix through I2C Assumptions Assumptions –Circuit will work –Communication with phone isn’t tough –Algorithms can be constructed to adequately process signal

Eye Candy

Demo Scenario Robostix Gumstix (Filtered) signal from body Data/commu- nication over I2C Data/comun- ication over Bluetooth Console

Next steps Complete acquisition/filtering circuitry (with opto- isolation) Complete acquisition/filtering circuitry (with opto- isolation) Work out communication with phone Work out communication with phone Measure latency to determine time available for processing signal Measure latency to determine time available for processing signal Do basic processing of signal – ex: heart rate detection Do basic processing of signal – ex: heart rate detection More advanced processing – ex: arrhythmia detection More advanced processing – ex: arrhythmia detection Develop phone GUI Develop phone GUI

Software architecture

What we’ve learned Verify your hardware ships with power supply Verify your hardware ships with power supply Opto-isolation required between electrode and circuit Opto-isolation required between electrode and circuit Making acquisition circuit trickier than originally thought Making acquisition circuit trickier than originally thought Triple-check drivers work for all operating systems used Triple-check drivers work for all operating systems used Learned about Gumstix, Robostix, i2c, hardware virtualization, cross-compiling Learned about Gumstix, Robostix, i2c, hardware virtualization, cross-compiling How to transfer files over serial How to transfer files over serial

Tentative Schedule DateMilestone 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