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Traumatic Brain Injury Eyewear “TB-Eye”. Todd Biesiadecki, Matthew Campbell, Matthew Vildzius ECE4007 L03 EM1 Advisor: Erick Maxwell December 14, 2011. Overview. Glasses to alert user of potential head injury

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traumatic brain injury eyewear tb eye

Traumatic Brain Injury Eyewear “TB-Eye”

Todd Biesiadecki, Matthew Campbell, Matthew Vildzius

ECE4007 L03 EM1

Advisor: Erick Maxwell

December 14, 2011

overview
Overview
  • Glasses to alert user of potential head injury
  • Approximately 50,000 people die and 85,000 suffer long term injuries due to Traumatic Brain Injury(TBI) per year
  • For non-contact sports such as skiing and cycling
    • Head impacts infrequent
    • specialized helmets not justified or practical
  • Unit development cost: $234
design objectives
Design Objectives
  • Lightweight, unobtrusive device
  • Battery powered
  • Data recording and storage
  • Wireless communication
  • Alert the user to get medical attention
  • Computer based graphical interface
physical dimensions
Physical Dimensions
  • Size:
    • Main Board: 3.4” long
    • Power Board: 1.45” long
  • Weight: 14.5 g
    • With Glasses: 46.2 g
accelerometer
Accelerometer
  • 16G accelerometer
    • Analog Devices ADXL345
    • 145uA max. current
    • Measurements of 10G or more will trigger an alert
    • Utility of recorded data more limited vs. full range device
  • Using built-in interrupts for threshold and data ready
microcontroller
Microcontroller
  • ATMega328 microcontroller with Arduino libraries
    • Power consumption slightly higher than competition
    • Well-supported libraries
  • Power consumption is 4mA while sampling
bluetooth transceiver
Bluetooth Transceiver
  • Acts as a cable replacement between device and computer
  • Only sends data when requested by GUI
  • ANT wireless protocol difficult to work with, BLE not yet available
    • Increased size
    • led to delay
saving serial data
Saving Serial Data
  • Python script
    • No standalone programs available
    • Difficulties with serial functions in MATLAB
  • Read binary data from the Bluetooth serial port
  • Format data as floating points in terms of g
  • Save data to a text file to be read by MATLAB
  • Called using the “Read Data From Device” button in GUI
integration with glasses
Integration with Glasses
  • Not allowed to modify given glasses for prototype
  • Prototype board is larger than desired
  • In production the circuit could be molded into the glasses frame
battery life in monitoring mode
Battery Life in Monitoring Mode
  • 110mAh battery
  • Microcontroller: 4mA max
  • Accelerometer: 0.15mA
  • Max current: 4.15mA
  • Worst-case battery life: 26 hours
  • Optimization could not be completed in time for demo
  • Slight additional power reduction should be possible
  • Notification LED adds additional 2mA
  • Peak of 45mA when Bluetooth is transmitting
acceptance testing
Acceptance Testing
  • Device placed on simulated head
  • Impact head with calibrated amount of force
    • Short impact similar to those expected to cause TBI
  • Used GUI to wirelessly receive, display data
    • Compare measured data to calibrated impact
  • Demonstrated LED turns on when threshold is exceeded
prototype pcb problems
Prototype PCB problems
  • Problems getting microcontroller to work (power, wrong frequency, wrong way of programming bootloader)
  • Resolved with third microcontroller
  • Bluetooth must be temporarily disconnected for programming
final budget
Final Budget
  • Total budget: $405.00
  • Total spent: $234
    • Expenditures:
      • Development: $69.85
      • Components for one board: $45.94 + PCB ($33) = $78.94
      • Unused parts: $85.21
        • Spare capacitors, resistors, etc.
        • ANT modules
        • Alternate EEPROM module
  • Oakley M-Frame MSRP: $129.00
future work
Future Work
  • Use ±100g accelerometer for full TBI detection
  • Low cost size reduction:
    • Use 4 or more layer board technology
    • Thinner PCB
    • Use 0402 and resistors and capacitors, QFN MCU
    • Eliminate headers, use smaller headers
  • High cost: Custom integrated circuits
  • Better integration with glasses frame
  • Method to more securely attach to the head
  • Smartphone application
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