Traumatic Brain Injury Eyewear “TB-Eye” Todd Biesiadecki, Matthew Campbell, Matthew Vildzius ECE4007 L03 EM1 Advisor: Erick Maxwell October 31, 2011

2 Overview Glasses to alert user of potential head injury For non-contact sports such as skiing and cycling –Head impacts infrequent –specialized helmets not justified or practical Unit development cost: $307.25

3 Device mounted on a pair of sunglasses Nose Battery Head Accelerometer and Wireless Communication Eyewear

4 Design Objectives Lightweight, unobtrusive device Battery powered Data recording and storage Wireless communication Alert the user to get medical attention Computer based graphical interface

5 TB-Eye System-Level Diagram

6 Device Operation

7 Accelerometer 100G accelerometers not available or cost-prohibitive 16G accelerometer used instead –Analog Devices ADXL345 –145uA max. current –Measurements of 16G or more will trigger an alert –Utility of recorded data more limited vs. full range device

8 Microcontroller ATMega368 microcontroller with Arduino libraries –Power consumption slightly higher than competition –Well-supported libraries Power consumption expected to be 1-4mA while sampling Plan to optimize code for low power by keeping the MCU in sleep mode

9 Battery Life in Monitoring Mode 110mAh battery Microcontroller: 4mA max Accelerometer: 0.15mA Max current: 4.15mA Expected worst-case battery life: 26 hours Assumes transmitter and LED indicator are off

10 ANT+ Transceiver Working on code to get the transceiver working with the microcontroller Need to get the USB transceiver working on a computer –Serial command interface

11 ANT vs. Bluetooth Advantages to ANT+ transceiver –Low power –Standard protocol –Small physical size Disadvantages –Not widely supported –Relatively short range, up to 30 meters.

12 Wireless Challenges Power –Maintaining a persistent channel is costly Information Storage –How do we store data while establishing a connection? What if we are out of range?

13 Graphical User Interface (GUI)

14 Graphical User Interface (GUI) Still to Do –Additional Features Text display if threshold is reached Text input for acceleration threshold –Improve appearance and layout

15 PCB Layout Schematic has been started Need to finish schematic and layout soon to order a printed board May be able to use a prototype board –More difficult to solder and less robust

16 Budget Total budget: $ Spent so far: $ Remaining budget: $ Still to Buy –Circuit Components ($50-75) –PCB ($50-100)

17 Future Work Finish GUI implementation Achieve wireless communication Manufactured PCB Optimize MCU power consumption

18 Project Schedule November 11 th – Circuit prototype completed November 11 th – GUI completed November 18 th – PCB fully assembled November 21 th – Test procedure designed and performed on the final product

19 Factoid 300,000 reported TBI cases caused by sports per year