FLIGHT DATA RECORDER FOR THE AMERICAN FOOTBALL by HC120914043336

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									FLIGHT DATA RECORDER
  FOR THE AMERICAN
      FOOTBALL
 Mechanical Engineering
     Final Project
     Masters of Engineering
        Chris J. Nowak
          Project Introduction

Why Put something
like this…




                    in something like
                    that?
        Background Information
   Accelerometer
    • ADXL250
          +/- 50g Sensitivity
   Microcontroller
    • PIC16F876
          20Mhz
          5 Internal A/D
           converters
          Flash Programmable
   SEEPROM
    • AT25640
          Memory Device that
           can store 4096 bytes
           of data
          SPI interface
Accelerometer Information
                ADXL250
                 • +/- 50g Sensitivity
                 • Analog Output
                 • 0.39g Resolution as
                   Configured
                       Can be increased by
                        scaling the total
                        range
                 • 8-bit Data Points
      Microcontroller Information


   PIC16F876

   Programmed in
    PicBasic Pro
          Electronics “Plan – A”
   1 Microcontroller –
    PIC 16F877
   4 Accelerometers –                      Accelerometers


    ADXL202, ADXL210,
    ADXL250
   8 x 128k
    SRAM Memory




                          Microcontroller                SRAM
           Electronics “Plan – B”
                                   Microcontroller


   4 Identical Modules
    • 1 Microcontroller –
                              SEEPROM
      PIC16C717
    • 1 Accelerometer – ADXL250
    • 2 32k SEEPROM Memory
      Chips
   Simple Modular Design
   Poor Selection of
    Microprocessor
                                           Accelerometer
           Final Electronics Layout
   2   Identical Modules
   1   Microcontroller - PIC16F876
   2   Accelerometers – ADXL250
   4   SEEPROM Memory Chips – AT25640


                         Microcontroller




        Accelerometers



        SEEPROMs
       Installation in the Football
   Plan A used a
    modified hard plastic
    “Football Phone”

   Plan B was abandon
    prior to packaging




                            Plan C used a modified
                            “Nerf” football
               Test Matrix
   Collect a 1g baseline data set by
    holding the ball so the X, Y, and Z
    axis were each subjected in turn to
    the Earth’s gravity

   Throw football in a tight spiral

   Lob football in and end-over-end
    tumble
                                                    Test Results
   Baseline Data

                                                                Calibration Rolls

                          132
    Accelerometer Units




                          130
                          128
                          126
                          124
                          122
                          120
                                    Laces Up, LED Front         Roll 90° About Y Axis         Laces Up, LED Front          Roll 90° About X Axis
                          118
                                0                         500                           1000                        1500                       2000
                                                                        Sample (1/200 sec)

                                                      Z1         X3         Y3           X1        Y1         X2       Y2
                                       Test Results
                    Forward Pass

                                       25 Yard Tight Spiral Pass
                                             Accelerometer #3 Data
                     150
                     140
Acceleration Units




                     130
                     120
                     110
                     100
                      90
                      80
                           0     100   200       300      400    500   600   700   800
                     X3     Y3                   Time (1/200 second)
                                           Test Results
                    End-Over-End Tumble

                                            End Over End Pass
                                            Accelerometers #2 & #3
                     150

                     140
Acceleration Units




                     130

                     120

                     110

                     100

                      90
                           0         100      200       300          400   500   600

                     X2    Y2   X3     Y3      Time (1/200 second)
    Design Recommendations
 Improve PC-Football Serial Interface
 Reduce the weight of the electronics
  by using more surface mount
  components
 Reduce size/weight of batteries or

  find alternative power source
 Add additional EEPROM chips to

  increase sample rate
 Scale accelerometers to +/- 15 G’s
Flight Data Recorder for
 the American Football

ANY QUESTIONS ??

								
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