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

2. Project Introduction Why Put something like this … in something like that ?

3. Background Information Accelerometer Accelerometer ADXL250ADXL250 +/- 50g Sensitivity +/- 50g Sensitivity Microcontroller Microcontroller PIC16F876PIC16F876 20Mhz 20Mhz 5 Internal A/D converters 5 Internal A/D converters Flash Programmable Flash Programmable SEEPROM SEEPROM AT25640AT25640 Memory Device that can store 4096 bytes of data Memory Device that can store 4096 bytes of data SPI interface SPI interface

4. Accelerometer Information ADXL250 ADXL250 +/- 50g Sensitivity Analog Output 0.39g Resolution as Configured Can be increased by scaling the total range 8-bit Data Points

5. Microcontroller Information PIC16F876 PIC16F876 Programmed in PicBasic Pro Programmed in PicBasic Pro

6. Electronics Plan – A 1 Microcontroller – PIC 16F877 1 Microcontroller – PIC 16F877 4 Accelerometers – ADXL202, ADXL210, ADXL250 4 Accelerometers – ADXL202, ADXL210, ADXL250 8 x 128k 8 x 128k SRAM Memory SRAM Memory Microcontroller Accelerometers SRAM

7. Electronics Plan – B 4 Identical Modules 4 Identical Modules 1 Microcontroller – PIC16C7171 Microcontroller – PIC16C717 1 Accelerometer – ADXL2501 Accelerometer – ADXL250 2 32k SEEPROM Memory Chips2 32k SEEPROM Memory Chips Simple Modular Design Simple Modular Design Poor Selection of Microprocessor Poor Selection of Microprocessor Microcontroller Accelerometer SEEPROM

8. Final Electronics Layout 2 Identical Modules 2 Identical Modules 1 Microcontroller - PIC16F876 1 Microcontroller - PIC16F876 2 Accelerometers – ADXL250 2 Accelerometers – ADXL250 4 SEEPROM Memory Chips – AT25640 4 SEEPROM Memory Chips – AT25640 Microcontroller Accelerometers SEEPROMs

9. Installation in the Football Plan A used a modified hard plastic Football Phone Plan A used a modified hard plastic Football Phone Plan B was abandon prior to packaging Plan B was abandon prior to packaging Plan C used a modified Nerf football Plan C used a modified Nerf football

10. 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 Earths gravity Collect a 1g baseline data set by holding the ball so the X, Y, and Z axis were each subjected in turn to the Earths gravity Throw football in a tight spiral Throw football in a tight spiral Lob football in and end-over-end tumble Lob football in and end-over-end tumble

11. Test Results Baseline Data Baseline Data

12. Test Results Forward Pass Forward Pass

13. Test Results End-Over-End Tumble End-Over-End Tumble

14. Design Recommendations Improve PC-Football Serial Interface Improve PC-Football Serial Interface Reduce the weight of the electronics by using more surface mount components Reduce the weight of the electronics by using more surface mount components Reduce size/weight of batteries or find alternative power source Reduce size/weight of batteries or find alternative power source Add additional EEPROM chips to increase sample rate Add additional EEPROM chips to increase sample rate Scale accelerometers to +/- 15 Gs Scale accelerometers to +/- 15 Gs

15. Flight Data Recorder for the American Football ANY QUESTIONS ??