1. HeartSavers Testing & Evaluation
Chris Hoffman
Ryan Kellogg
Mike Zizza
March 28, 2007

2. Test Cases Test Cases: Coming online (bootstrap use case)
Project Concept:
Wearable heart monitor: Electrodes in shirt, capture/process signal, send data wirelessly to smart phone
Status update:
Prototyped heart rate detection in MATLAB
Bluetooth on smart phone
JTAG for troubleshooting Gumstix
Test Cases:
Coming online (bootstrap use case)
Shutting down gracefully (teardown use case)
Transmitting data (between sensors, embedded hardware, phone)
Data processing (accuracy, performance)
Requests from memory
Failure recovery

3. Performance Testing What is latency between robostix and gumstix?
What is analysis algorithm latency? With arrhythmia v. normal input data?
What is analysis algorithm accuracy? (What % of QRS peaks correctly identified)
What is algorithm throughput? (# QRS waves processed/ second)
How consistent is sampling rate?

4. Testing process
We have a machine which will output a synthesized ECG signal
Use as source of known test data
Record test data in files for algorithm testing
Bash scripting to:
Initialize gumstix / robostix
Test communication paths
Perform algorithm unit testing
Test data for normal rhythm, arrhythmias, etc
Evaluate algorithm accuracy
Evaluate algorithm performance

5. Looking Ahead Difficulties anticipated:
Making amplification circuit work well
Keeping good contact between electrodes and skin during movement
Managing algorithm latency and accuracy
Trickiest to test: arrhythmia detection accuracy
Lessons learned so far:
Don’t fry/brick boards
Miniaturized boards don’t have easy access to standardized connectors (ie, JTAG)

6. Questions ?