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Back Assist

Back Assist. A Proximity Sensor for Wheelchairs. Team 24. Stephanie Toth Isabelle Harroch Alexander Silverman Kevin Lynch Daniel Lofaro (Captain). Outline. Problem Statement Problem Background Work Done Towards Solution Final Solution Technical Background of Solution

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Back Assist

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  1. Back Assist A Proximity Sensor for Wheelchairs

  2. Team 24 • Stephanie Toth • Isabelle Harroch • Alexander Silverman • Kevin Lynch • Daniel Lofaro (Captain)

  3. Outline • Problem Statement • Problem Background • Work Done Towards Solution • Final Solution • Technical Background of Solution • Other Technical Information • Summary

  4. Problem Statement • 1.5 Million Americans in wheelchairs • Hazards • Tables • Chairs • Other People • Stairs

  5. Problem Background • Accessories • Power Rolls IV • Curb-Climbing • MAid

  6. Accessories • Joysticks • Light Batteries • Electromagnetic Brakes • Anti-Tip Solid Wheels • Swinging Support With Hand Grips • Sensing Devices

  7. Power Rolls IV and Curb-Climbing Source:www.wws.princeton.edu Source:www.indetech.com

  8. MAid Source:ieeexplore.ieee.org

  9. Design Decisions • Methods of Object Detection • Active vs. Passive Response • Human/Computer Interface • Final Solution

  10. Methods of Object Detection Ultrasonic Sensor Infrared Sensor Source: Original Source: Original

  11. Advantages Easier on wheelchair operator More accurate than humans Disadvantages Could lead to worse locations Prone to false reactions User’s over reliance Active Response

  12. Passive Response • Advantages • Eliminates active response problems • Allows the user to remain in control • Disadvantages • Not as responsive

  13. Human/Computer Interface Source: Original

  14. Final Solution • Ultrasonic sensors • Parallel sensors • Objects in rear • Arm rest support • Downward sensors • Sudden drops • Lower chair body

  15. Sensor Orientation Created with the help of Jon Bowen

  16. Sensor and Control Box Placement Control Box Placement Parallel Sensor Placement Downward Sensor Placement Source: www.mrmobility.com

  17. Final Solution Continued • Control Box • Armrest • LEDs • Parallel Indicators • 2 Yellow LEDs • 2 Red LEDs • Downward Indicators • 1 Red LED • Waterproof

  18. Control Box Source: Original

  19. Back Assist Prototype Source: Original

  20. Prototype Schematics Source: Original

  21. Proximity Warning • Green 45-60 cm • Yellow 25-45 cm • Red 0-25cm

  22. Proximity Warning Program Source: Original

  23. Stairs Warning • Green – No Stairs “Safe” • Red – Stairs “Warning”

  24. Stairs Warning Program Source: Original

  25. Constraints and Environmental Impacts • Constraints • See Objects • Cost • FCC Regulations • Environmental • Disposal

  26. Budget • 1000 Units Produced • Production Cost: $153,000 • 50% Overhead • Total Cost: $230,000 • Unit Selling Price: $250 • Profit: $20,000 - $90,000 • Prototype Cost: $115 + Development Costs All amounts are estimates

  27. Summary • Aware of Objects • Easy Visual Output • Cost Effective

  28. Thank You For more information please visit http://BackAssist.webhop.org

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