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Enhanced Navigational Aid For the Visually Impaired
Peter Okma (CPE)Abhay Sampath (EE)
Katelyn Sapio (EE)
04/28/2010
Presentation Outline
1. Project Formulation Peter Okma
2. Design Specifics Abhay Sampath
3. Additional Considerations Katelyn Sapio
Problem• There is a need for devices to aid the visual impaired
with navigation• Widely used solutions don’t take advantage of modern
technologies– Seeing eye dogs, canes, etc.
• The few high-tech solutions currently available are not very effective and are extremely expensive– MOWAT, Laser Cane
Project Goals
• Design a device that will provides useful feedback to enhance the navigational ability of the visually impaired
• The device should be– Useful– Portable – Reliable– Affordable
Technology Cost Accuracy Mobility Complexity Power Consumption
LIDAR Very High Extremely Accurate
Very Low Very Complex
Very High
Camera Recognition
High Medium Low Complex Very High
Echolocation Low Low High Moderate Low
DirectionalUltrasonic
Medium Accurate High Moderate Low
Solutions Considered
Chosen Design
High-Level Algorithm
• Sensor reads distance• Microcontroller gets the direct
distance reading, then computes the differential reading
Intuitive Implementation
• Amplitude proportional to distance• Pitch proportional to velocity (differential
distance)• Difference between either ear is related to
angle• Sensor information is delivered through the
corresponding speakers
Functional Flowchart
System Model
System Model
System Model
Economics
• Ultrasonic Sensors $120– Maxbotix LV-MaxSonar-EZ
• Speakers $15• Microcontroller & Board $65– Arduino Mega2560– Atmel ATmega2560
• Miscellaneous $50_____• Total $250
Health and Safety
• Should not obstruct hearing– Software: Beeps vs. constant tone– Hardware: Shape of headgear
• Safety Risks– Product meant for eye level detection• Learning Curve
– Battery Life– Calibration and Accuracy
Ethical Responsibilities
• Reliability vs. Cost– Software: Must act with minimal delay– Hardware: Accuracy and reliability must be
maximized• Marketing: Risks and limitations should be
made clear– Ex: This device cannot sense elevations in floors,
so it must be used with a cane or a seeing eye dog
Conclusion
• Improvements on existing products– Omni-directional awareness– Velocity Recognition – Comfort/Aesthetics– Intuitive audio feedback– Low Cost
References• http://www.rehab.research.va.gov/jour/74/11/2/443.pdf• http://classes.engr.oregonstate.edu/eecs/spring2003/ece44x/groups/g14/white%20papers/whitepaper_matt.htm• http://www.maxbotix.com/MaxbotixHome.html• http://www.brailleinstitute.org/facts_about_sight_loss• Fast and robust tracking of multiple moving objects with a laser range finder• http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=932853&tag=1• A comparison of line extraction algorithms using 2D laser rangefinder• http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=1545234• Laser range finder based on synchronized scanners• http://www.opticsinfobase.org/abstract.cfm?&id=27938• Compact laser radar and three-dimensional camera• http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-23-4-800 • http://www.tsbvi.edu/seehear/fall98/waytogo.htm• http://www.noogenesis.com/eta/current.html• http://www.agis.com/Eldercare-Basics/Assisted-Daily-Living-Aids/Mobility/Blind-Mobility-Aids/default.aspx• http://en.wikipedia.org/wiki/Blindness#Adaptive_techniques_and_aids• http://trid.trb.org/view.aspx?id=810306 • http://www.onlineethics.org/Resources/ethcodes/EnglishCodes/9972.aspx• http://www.onlineethics.org/Resources/ethcodes/EnglishCodes/IEEEguidelines.aspx• http://www.acm.org/about/se-code• http://www.ilr.cornell.edu/edi/disabilitystatistics/• http://www.worldaccessfortheblind.org/node/119• http://en.wikipedia.org/wiki/Animal_echolocation