device_requirements.md

Device Requirements

Constraints

• Battery life with custom software running for 8 days
• Sensor sampling frequency >1/3 Hz
• Sensors
  • Accelerometer
  • Global Positioning System (GPS)
• Data privacy
  • Ability to turn off communication capability of device
  • Data is stored on device
    • 5 MB storage per sensor
      • Enough for 7 days of continuous logging at 1/3 Hz
  • Direct retrieval of GPS and other identifying data
    • No first-party (by company of device) logging of data
• Reproducibility of data
  • Ability to turn off screen and all user interfacing

Objectives (in addition to Constraints)

• Production at scale
  • Potential for automated data retrieval process
  • Potential for automated deployment of custom software to all devices
• Sensor sampling frequency of 1 Hz
• 15 MB per sensor
  • Enough for 7 days of continuous logging at 1 Hz
• Sensors
  • Heart rate (beats per minute)
  • Body presence (worn or not)
  • Barometer
  • Gyroscope
  • Orientation (quaternion)
  • Oxygenation