flight data recorder for the american football mechanical engineering final project masters of...
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FLIGHT DATA RECORDER FLIGHT DATA RECORDER FOR THE AMERICAN FOR THE AMERICAN
FOOTBALLFOOTBALL
Mechanical Engineering Mechanical Engineering Final ProjectFinal Project
Masters of EngineeringMasters of EngineeringChris J. NowakChris J. Nowak
Project IntroductionProject Introduction
Why Put something
like this…
in something like
that?
Background InformationBackground Information AccelerometerAccelerometer
• ADXL250ADXL250 +/- 50g Sensitivity+/- 50g Sensitivity
MicrocontrollerMicrocontroller• PIC16F876PIC16F876
20Mhz20Mhz 5 Internal A/D 5 Internal A/D
convertersconverters Flash ProgrammableFlash Programmable
SEEPROMSEEPROM• AT25640AT25640
Memory Device that Memory Device that can store 4096 bytes can store 4096 bytes of dataof data
SPI interfaceSPI interface
Accelerometer InformationAccelerometer Information
ADXL250ADXL250• +/- 50g Sensitivity+/- 50g Sensitivity• Analog OutputAnalog Output• 0.39g Resolution as 0.39g Resolution as
ConfiguredConfigured Can be increased by Can be increased by
scaling the total scaling the total rangerange
• 8-bit Data Points8-bit Data Points
Microcontroller InformationMicrocontroller Information
PIC16F876PIC16F876
Programmed in Programmed in PicBasic ProPicBasic Pro
Electronics “Plan – A”Electronics “Plan – A” 1 Microcontroller – 1 Microcontroller –
PIC 16F877PIC 16F877 4 Accelerometers – 4 Accelerometers –
ADXL202, ADXL210, ADXL202, ADXL210, ADXL250 ADXL250
8 x 128k 8 x 128k
SRAM MemorySRAM Memory
Microcontroller
Accelerometers
SRAM
Electronics “Plan – B”Electronics “Plan – B”
4 Identical Modules4 Identical Modules• 1 Microcontroller – PIC16C7171 Microcontroller – PIC16C717• 1 Accelerometer – ADXL2501 Accelerometer – ADXL250• 2 32k SEEPROM Memory 2 32k SEEPROM Memory
ChipsChips Simple Modular DesignSimple Modular Design Poor Selection of Poor Selection of
MicroprocessorMicroprocessor
Microcontroller
Accelerometer
SEEPROM
Final Electronics LayoutFinal Electronics Layout 2 Identical Modules2 Identical Modules 1 Microcontroller - PIC16F8761 Microcontroller - PIC16F876 2 Accelerometers – ADXL2502 Accelerometers – ADXL250 4 SEEPROM Memory Chips – AT256404 SEEPROM Memory Chips – AT25640
Microcontroller
Accelerometers
SEEPROMs
Installation in the FootballInstallation in the Football Plan A used a modified hard Plan A used a modified hard
plastic “Football Phone”plastic “Football Phone”
Plan B was abandon prior to Plan B was abandon prior to packagingpackaging
Plan C used a modified Plan C used a modified “Nerf” football“Nerf” football
Test MatrixTest Matrix Collect a 1g baseline data set by Collect a 1g baseline data set by
holding the ball so the X, Y, and Z holding the ball so the X, Y, and Z axis were each subjected in turn to axis were each subjected in turn to the Earth’s gravitythe Earth’s gravity
Throw football in a tight spiralThrow football in a tight spiral
Lob football in and end-over-end Lob football in and end-over-end tumbletumble
Test ResultsTest Results
Baseline DataBaseline Data
Calibration Rolls
118
120
122
124
126
128
130
132
0 500 1000 1500 2000
Sample (1/200 sec)
Accele
rom
ete
r U
nit
s
Z1 X3 Y3 X1 Y1 X2 Y2
Laces Up, LED Front Roll 90° About Y Axis Laces Up, LED Front Roll 90° About X Axis
Test ResultsTest Results
Forward PassForward Pass
25 Yard Tight Spiral PassAccelerometer #3 Data
80
90
100
110
120
130
140
150
0 100 200 300 400 500 600 700 800
Time (1/200 second)
Ac
ce
lera
tio
n U
nit
s
X3 Y3
Test ResultsTest Results
End-Over-End TumbleEnd-Over-End Tumble
End Over End Pass Accelerometers #2 & #3
90
100
110
120
130
140
150
0 100 200 300 400 500 600
Time (1/200 second)
Accele
rati
on
Un
its
X2 Y2 X3 Y3
Design RecommendationsDesign Recommendations
Improve PC-Football Serial InterfaceImprove PC-Football Serial Interface Reduce the weight of the electronics Reduce the weight of the electronics
by using more surface mount by using more surface mount componentscomponents
Reduce size/weight of batteries or Reduce size/weight of batteries or find alternative power sourcefind alternative power source
Add additional EEPROM chips to Add additional EEPROM chips to increase sample rateincrease sample rate
Scale accelerometers to +/- 15 G’sScale accelerometers to +/- 15 G’s
Flight Data Recorder for Flight Data Recorder for the American Footballthe American Football
ANYANY QUESTIONSQUESTIONS ????