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Integrated Workout Shoe

Integrated Workout Shoe. Peter Katlic Advisor: Shane Cotter. Current Offerings – Step Counter. Uses internal switch to count “steps” Simple design Small size Low cost($10-$20) Accuracy(up to 50% error rate) Single user. Current Offerings - GPS. Garmin Forerunner

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Integrated Workout Shoe

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  1. Integrated Workout Shoe Peter Katlic Advisor: Shane Cotter

  2. Current Offerings – Step Counter Uses internal switch to count “steps” • Simple design • Small size • Low cost($10-$20) • Accuracy(up to 50% error rate) • Single user

  3. Current Offerings - GPS Garmin Forerunner Uses GPS signals to record waypoints  distance • Accuracy(1-5% error rate) • Ease of use • Multiple users • Cost($120-$330) • Loss of signal under tree cover • Bulky design

  4. Current Offerings - Accelerometer Apple Nike + iPod Uses accelerometer to measure acceleration  distance • Accuracy(up to 10% error rate) • Ease of use • Multiple users • Cost($30) (factoring in iPod($150-$350)) • Reliance on iPod

  5. Purpose • Current offerings are extremes • Create product in between others • Combine benefits of each design

  6. Goals Reached Produced a device that meets the following criteria: • Able to be attached to shoe tongue • Part cost of $30 • Records time and distance on device • Registers strides with close to 100% accuracy • Measures distance with 90% projected accuracy • Online workout log

  7. Design Choices • 2-axis vs. 3-axis accelerometer - no need for z-axis measurements • Microcontroller (C8051F330) - small form factor - ADC - adequate RAM - sufficient I/O pins

  8. Development Design • Silicon Labs C8051FX20-TB microcontroller development board • Analog Devices ADXL321EB-ND accelerometer development board • Lumex LDQ-M284RI multiplexed display

  9. Final Design (EAGLE) Circuit Schematic Board Layout

  10. Components • Serpac CA-10 waterproof enclosure • Silicon Labs C8051F330-GM microcontroller • Analog Devices ADXL321JCP accelerometer • Lumex LDQ-M284RI multiplexed display

  11. Input/Output

  12. Implementation • Timer0 seconds • Timer3 sampling rate • ADC0 getting input at 100Hz • Port2 display segments • Port4 display digit

  13. Implementation • Start/stop is pressed  timing begins, sampling begins, display time • Stride is detected  calculate stride/second rate and update distance • Every minute  store total distance in array • Start/stop is pressed  timing stops, sampling stops, display distance

  14. Testing – Phase 1 Development Device • Accelerometer data range • Data capture on 8051 • Accurate stride detection • Simple trials At 2.441V

  15. Testing – Phase 2 Final Device • Adjust code for new platform • Test walks/runs • Known pace testing • Calibration

  16. Online Workout Log • PHP with SQL database • Multiple users • Store workouts • Graph workouts • View workouts by date or user

  17. Future Goals/Improvements • Finish standalone device • Integrate device into shoe • Transfer data to computer and workout log

  18. Questions Acknowledgements: James Hedrick

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