Cumulative Design Review
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Cumulative Design Review. Team RCA March 1, 2013. RCA (Real-Time Concussion Analyzer). Timothy Coyle, EE Impact Processing & Communication. Kenneth Van Tassell, EE User Interface & Communication. Scott Rosa, CSE Server & Data Analysis. Justin Kober, EE Sensor Network & Power.

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Team RCA March 1, 2013

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Team rca march 1 2013

Cumulative Design Review

Team RCA

March 1, 2013


Team rca march 1 2013

RCA (Real-Time Concussion Analyzer)

Timothy Coyle, EE

Impact Processing & Communication

Kenneth Van Tassell, EE

User Interface & Communication

Scott Rosa, CSE

Server & Data Analysis

Justin Kober, EE

Sensor Network & Power


Team rca march 1 2013

Concussion Detection in High School Football

  • Current concussion detection

    • Train coaches to recognize symptoms

  • Players may hide or not experience symptoms right away

  • RCA will monitor each player and alert the coach with the risk of concussion after each collision

  • Customer feedback

    • College trainers and high school athletic director


Team rca march 1 2013

Our Solution: Block Diagram

  • Bluetooth

  • Android

  • Server


Team rca march 1 2013

Review of MDR

  • Demonstration of Impact Data Collection

    • Single accelerometer interfaced with processor

    • Helmet processor transmission

  • Demonstration of Base Station/UI Interaction

    • Using test data

      • Receive from helmet

      • Run algorithm

    • UI able to receive and display test results


Team rca march 1 2013

Sensors

  • ADXL 78 MEMS Accelerometer

    • Single axis

    • +/- 70 g range

    • 27 mV/g sensitivity

    • 5 V and 1.3 mA

  • PCB Design

    • 3 connection wires

    • 1 noise filtering capacitor

    • 1 sensor


Team rca march 1 2013

Battery

  • System Power Requirements

    • Maximum current ≈ 300 mA

    • 5 volts

    • 5 hour duration

    • Total energy consumption = 1390 mAh

  • USB Battery Pack

    • 2000 mAh

    • 5.5 V, 700 mA

    • Rechargeable

    • Packaging in helmet


Team rca march 1 2013

Sensor Packaging in Helmet

Sensors

IC and battery


Team rca march 1 2013

Human Skull

  • Loaded vs empty helmet

  • Simulate the neck

  • Controlled test for impact duration

    • Small increase


Team rca march 1 2013

Application / User Interface and UI Communication

  • Design Requirements

    • Simple Operation / User Friendly

    • Displays Meaningful Information

    • User Adaptable

      • Coach vs. Trainer

  • Player Adaptable

    • Adaptive Threshold Monitoring

  • Challenges

    • Improving Processing

    • Maintaining Continuity

    • Redesigning Bluetooth Parsing for Variable Hits


  • Team rca march 1 2013

    Application / User Interface and UI Communication

    • Drop Down Menu

    • Bluetooth Permission


    Team rca march 1 2013

    Application / User Interface and UI Communication

    • Home Screen

    • Impact Alert


    Team rca march 1 2013

    Risk Function

    C1= -12.531

    C2= 0.0020


    Team rca march 1 2013

    Calculating Magnitude Hit Vector


    Team rca march 1 2013

    Isolated Algorithm Error Characterization


    Team rca march 1 2013

    Isolated Algorithm Error Characterization


    Team rca march 1 2013

    Impact Processing & Communication

    • ATmega32U4 8-bit AVR Microcontroller

      • MDR sample rate = 2.08ms per sample

      • 0.152ms per sample (92.7% increase)

      • Threshold triggering

    • Wireless Transmission


    Team rca march 1 2013

    Impact Processing & Communication Experiments

    • Experiments

      • Threshold Estimation

        • Mean, Standard Deviation


    Team rca march 1 2013

    Proposed CDR Deliverables

    • Demonstration of Complete System Functionality

      • Show implementation of battery powered system

      • Impact the helmet with a known force

      • Transmit impact data with required sample rate from the sensor array to Android device

      • Display risk of concussion with confidence interval on Android device

      • Display player impact history on Android device upon user request


    Team rca march 1 2013

    Demo

    Demo


    Team rca march 1 2013

    Timeline


    Team rca march 1 2013

    FPR and Demo Day

    • Fully Integrated and Wearable Helmet

      • Stable battery

      • Player specific adaptability

    • Reliable User Friendly Android Application

      • User specific settings

    • Risk Calculation with Confidence Interval

      • Probability of Error

    • DEMO

      • Impact Dummy

      • Server, Impact Location & Application


    Team rca march 1 2013

    Thank You

    Questions


    Team rca march 1 2013

    Thank You

    Questions


    Team rca march 1 2013

    Data Processing and Storage

    • Requirements From MDR

      • Calculate a magnitude hit vector from the accelerometer data

      • Calculate risk for each hit as well as cumulative risk

      • Be able to store raw accelerometer data

    • Accomplished

      • Calculates the hit vector in an average of 411.6 ms. The overall program calculates risk in an average of 1.06 s

      • Tested and graphed data

      • Set up server with database to store raw accelerometer data and hit data


    Team rca march 1 2013

    Material Costs

    This cost could be reduced by $1,200 purchasing the RN-41 and designing the BlueTooth modem ourselves


    Team rca march 1 2013

    Max phone memory size:

    64 GB

    Min phone memory size:

    2 GB

    Top Ten Paid apps in Itunes 11/26/12

    Max App memory size:

    791

    MB

    Min App memory size:

    3.1

    MB

    Average of max and min memory size:

    397.05

    MB

    Size of Entry in table is

    40

    Bytes

    0.00004

    MB

    9926250

    hits in total

    90

    Avg hits per college season per player:

    1177

    seasons played by college player:

    4

    hits for college team in 1 years

    423720

    Team data for 4 years

    17

    MB

    Team data per year

    4

    MB

    Store data for

    99

    teams per year

    Store data for

    23

    college teams for 4 years

    Computational Analysis

    • Storage and computation can be done on a phone

    • Server hosts MySQL database


    Team rca march 1 2013

    Preliminary Weight Analysis

    • NFL Helmet Approximately 6lbs. or 2.722kg

    • ATMega328P = 2g

    • MEMS each approximately 1g

    • Gyroscope approximately 2g

    • Power approximately 23g

    • Estimated total system weight (not including packaging) = 35g-40g

    • 5% of helmet is approximately 136g


    Team rca march 1 2013

    Requirements Analysis: Specifications

    • Real-Time continuous impact measurements

    • Player specific adaptability

    • Equipment weight increase less than 5%

    • Effective range 150 m

    • Responds in under two seconds

    • Robust

      • Interference

      • Durable


    Team rca march 1 2013

    Measured System Energy Consumption


    Team rca march 1 2013

    Worst Case Power


    Team rca march 1 2013

    Single-Axis VS. Multi-Axis

    • Lower frequency response

      • Vibrations

    • Mapping to graph

      • More data points

    • Cost


    Team rca march 1 2013

    Proposed CDR Goals

    • Impact Data Collection

      • Power circuit

      • Sensor array

      • Processing and transmission of sensor array

    • User Interface

      • Cumulative linear acceleration

      • User preferences

      • Risk display

      • Stability

    • Data Analysis

      • Sub-concussive impacts integrated

      • Statistical analysis for entire system


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