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WEARABLE NAVIGATION DEVICE FOR THE BLIND. MAY 18, 2012. MSD II - TEAM P12016. PRESENTATION AGENDA. Agenda (Outline for now) Team Roles Intro to Project Summary of Requirements System Architecture Physical Prototype Major Components Snap Stresses & Plastic Tolerances Testing

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Presentation Transcript
slide1

WEARABLE NAVIGATION DEVICE

FOR THE BLIND

MAY 18, 2012

MSD II -TEAM P12016

slide2

PRESENTATION AGENDA

  • Agenda (Outline for now)
  • Team Roles
  • Intro to Project
  • Summary of Requirements
  • System Architecture
  • Physical Prototype
  • Major Components
  • Snap Stresses & Plastic Tolerances
  • Testing
  • Test Results & Data
  • Final Spec Comparison
  • Lessons Learned
  • Future Work
  • Q & A
slide3

TEAM ROLES

  • Oliver Wing | CE
  • Path-finding algorithm
  • Path-following algorithm
  • Software & functionality testing
  • Magy Yasin | ISE
  • Scheduling
  • Test creation & documentation
  • Attachment manufacture
  • Curtis Beard | EE
  • PCB design
  • Testing & support
  • Dave Taubman | EE
  • PCB design
  • PCB testing & support
  • Algorithm creation
  • Stu Burgess | ME
  • Plastic enclosure design
  • Mechanical assembly & tolerances
  • Thermal modeling
  • Jeff Chiappone | ME
  • Plastic enclosure design
  • Stress testing
  • Poster design
  • Aalyia Shaukat | EE
  • PCB design
  • Testing & support

?

slide4

PROJECT INTRODUCTION

  • Description:
  • The blind face numerous challenges when navigating inside buildings
  • Braille not always helpful - only about 10% of the blind read Braille
  • Team focused on creating a small electronic device for this purpose
  • Prior teams’ accomplishments:
  • Working prototype was created
  • Very heavy, bulky, enclosure did not contain all components
  • Goals for this project:
  • Dramatically reduce size and weight
  • Make device less conspicuous
  • Make device portable and allow enclosure to contain all components
slide5

REQUIREMENTS SUMMARY

  • Blind individuals needed a device that:
  • Was lightweight, fairly conspicuous, easy to use and learn
  • Guided them towards a destination, warned when they detracted
  • Provided non-visual/non-auditory feedback (not Braille)
  • In general, device needed to be:
  • Resilient, able to withstand a 3-foot drop
  • Able to allow the user change the battery in less than a minute
slide6

SYSTEM ARCHITECTURE

Dave, Olliver, (Jackson?)

slide7

PHYSICAL

PROTOTYPE

slide8

Printed circuit board

  • Links together all other electronics
  • Contains micro-controller unit
  • Vibrational motors
  • Send out long or pulsed vibrational feedback
  • User senses these and interprets for directions
  • RFID tag reader
  • Acts as the “eyes” of the device
  • Senses RFID tags in building
  • Numeric keypad
  • Takes room number input from user
  • Magnetometer
  • Keeps device working properly in any orientation
  • Antenna
  • Senses RFID tags for reader
  • Plastic enclosure
  • Houses all electronics
  • Allows easy access to battery
  • Elastic sleeve
  • Holds electronics to body
  • Keeps device secure and wearable

MAJOR COMPONENTS

slide9

Fig 1: Successful and unsuccessful snap orientation

Fig 2: Original prototype housing with very loose fit

SNAP STRESS & PLASTIC TOLERANCE

  • Snaps:
  • Largely dependent on manufacture orientation (Fig 1):
  • Length and width carefully chosen to withstand plastic stress limits
  • Plastic tolerances:
  • Rapid-prototype machine subject to +/- extra layer of .007’’ plastic
  • Largest factor in number of prototypes made (Fig 2); fit needed to be perfect
slide10

90%

92%

98%

98%

100%

100%

Image of thermal

test results?

Image of Ansys model?

TESTING

  • Drop Tests:
  • Qualification: device needed to survive fall of 3 feet onto concrete surface
  • Result: device passed, no fracture of cracking of plastic housing or other components during fall
  • Ergonomic Testing:
  • Qualification: highest percentage of vibrations perceived over all other locations
  • Result: three distinct locations chosen with specific distance determined by additional qualitative testing.
  • Thermal Testing:
  • Qualification: air inside device can not exceed ___ degrees F
  • Result: housing successfully dissipates enough heat during use to meet the qualification
slide11

TEST RESULTS & DATA

Do we still need this if we can fit all the test stuff on one slide? How much detail do we need for testing?

slide13

LESSONS LEARNED

  • Mechanical:
  • The time for ideation is slim--brainstorm quickly, then arrive at a solution
  • Consider local vendors for quick (<1 day) turn around and last-second items
  • Rapid prototyping is a successful choice for quick turn-around and cost effectiveness
  • Rapid prototyping will always be much less precise than expected-plan accordingly for fit and tolerances
  • Electronic:
  • Learn necessary software algorithms for path-finding and path-following during MSD I
  • Collaborate directly with other teams or previous team/project members if possible
  • Always plan for 1-2 weeks of changes/debugging to PCB even if design seems finalized
  • Scheduling:
  • Anything to add here?
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