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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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Presentation Transcript
back assist

Back Assist

A Proximity Sensor for Wheelchairs

team 24
Team 24
  • Stephanie Toth
  • Isabelle Harroch
  • Alexander Silverman
  • Kevin Lynch
  • Daniel Lofaro (Captain)
outline
Outline
  • Problem Statement
  • Problem Background
  • Work Done Towards Solution
  • Final Solution
  • Technical Background of Solution
  • Other Technical Information
  • Summary
problem statement
Problem Statement
  • 1.5 Million Americans in wheelchairs
  • Hazards
    • Tables
    • Chairs
    • Other People
    • Stairs
problem background
Problem Background
  • Accessories
  • Power Rolls IV
  • Curb-Climbing
  • MAid
accessories
Accessories
  • Joysticks
  • Light Batteries
  • Electromagnetic Brakes
  • Anti-Tip Solid Wheels
  • Swinging Support With Hand Grips
  • Sensing Devices
power rolls iv and curb climbing
Power Rolls IV and Curb-Climbing

Source:www.wws.princeton.edu

Source:www.indetech.com

slide8
MAid

Source:ieeexplore.ieee.org

design decisions
Design Decisions
  • Methods of Object Detection
  • Active vs. Passive Response
  • Human/Computer Interface
  • Final Solution
methods of object detection
Methods of Object Detection

Ultrasonic Sensor

Infrared Sensor

Source: Original

Source: Original

active response
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
passive response
Passive Response
  • Advantages
    • Eliminates active response problems
    • Allows the user to remain in control
  • Disadvantages
    • Not as responsive
human computer interface
Human/Computer Interface

Source: Original

final solution
Final Solution
  • Ultrasonic sensors
  • Parallel sensors
    • Objects in rear
    • Arm rest support
  • Downward sensors
    • Sudden drops
    • Lower chair body
sensor orientation
Sensor Orientation

Created with the help of Jon Bowen

sensor and control box placement
Sensor and Control Box Placement

Control Box Placement

Parallel Sensor Placement

Downward Sensor Placement

Source: www.mrmobility.com

final solution continued
Final Solution Continued
  • Control Box
    • Armrest
    • LEDs
  • Parallel Indicators
    • 2 Yellow LEDs
    • 2 Red LEDs
  • Downward Indicators
    • 1 Red LED
  • Waterproof
control box
Control Box

Source: Original

back assist prototype
Back Assist Prototype

Source: Original

prototype schematics
Prototype Schematics

Source: Original

proximity warning
Proximity Warning
  • Green 45-60 cm
  • Yellow 25-45 cm
  • Red 0-25cm
stairs warning
Stairs Warning
  • Green – No Stairs “Safe”
  • Red – Stairs “Warning”
stairs warning program
Stairs Warning Program

Source: Original

constraints and environmental impacts
Constraints and Environmental Impacts
  • Constraints
    • See Objects
    • Cost
    • FCC Regulations
  • Environmental
    • Disposal
budget
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

summary
Summary
  • Aware of Objects
  • Easy Visual Output
  • Cost Effective
thank you

Thank You

For more information please visit

http://BackAssist.webhop.org