HeartSavers Testing

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HeartSaversTesting Evaluation

• Chris Hoffman
• Ryan Kellogg
• Mike Zizza
• March 28, 2007

http//www.ece.cmu.edu/ece549/spring07/team5/
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Test Cases

• 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

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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?

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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

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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
• Dont fry/brick boards
• Miniaturized boards dont have easy access to
  standardized connectors (ie, JTAG)

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Questions ?