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STEVI: Sensory Technology Enhancement for the Visually Impaired

STEVI: Sensory Technology Enhancement for the Visually Impaired. 10/20/2009. Preliminary Design Review. Team Vouvakis. Electrical and Computer Engineering. The Problem. The visually impaired can not navigate without assistance. Cane People The Guide Dog.

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STEVI: Sensory Technology Enhancement for the Visually Impaired

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  1. SDP Presentation STEVI:Sensory Technology Enhancement for the Visually Impaired 10/20/2009 Preliminary Design Review Team Vouvakis Electrical and Computer Engineering

  2. SDP Presentation The Problem The visually impaired can not navigate without assistance. • Cane • People • The Guide Dog Electrical and Computer Engineering

  3. SDP Presentation Long Cane • Common Solution • Simple, cheap, robust and reliable • Limited range • Problems with obstacles above waist. Electrical and Computer Engineering

  4. SDP Presentation Electronic Solutions • Electronic Travel Aids (ETAs) • Detect obstacles with sensors • Typically ultrasonic • Indicate obstructions to user • Feedback often auditory or tactile Electrical and Computer Engineering

  5. SDP Presentation Limitations of Existing Electronic Aids • Expensive! $400 to $1000 • Trouble with stairs and slopes • Insufficient directivity • Problems with reflections indoors • Problems with absorbing objects Electrical and Computer Engineering

  6. SDP Presentation Requirement Specifications Electrical and Computer Engineering

  7. SDP Presentation Big Picture Electrical and Computer Engineering

  8. SDP Presentation Proposed Solution - STEVI Sensor Fusion! Auditory & Tactile Feedback Electrical and Computer Engineering

  9. SDP Presentation Block Diagram - Basic Electrical and Computer Engineering

  10. SDP Presentation Block Diagram - Intermediate Electrical and Computer Engineering

  11. SDP Presentation Block Diagram – Full Function Electrical and Computer Engineering

  12. SDP Presentation Ultrasonic Sensors 2 x Maxbotix UT www.sparkfun.com • Average time of flight to calculate distance • Angle calculated from difference in signal return times c = speed of sound in air = 343 m/s Electrical and Computer Engineering

  13. SDP Presentation Laser Sony Supper HAD Setup: www.lightinthebox.com • Detect distances with triangulation • Used for handling stairs, curbs, angled walls and smaller objects • (1/3-inch Sony Supper HAD Color CCD Wired Mini Pinhole Camera Camera view: Electrical and Computer Engineering

  14. SDP Presentation Infra Red www.sparkfun.com • Has a viewing angle of 40 deg. • Detect closer objects • Prevents user from hitting objects while sweeping left and right Electrical and Computer Engineering

  15. SDP Presentation Microcontroller www.digikey.com • 3 x 28 pin ATMega88PA • Features: • 8kB Program Space • 20 MIPs at 20 MHz • 23 I/O Lines, 6-channel 10 bit ADC • In-circuit programming - JTAG Electrical and Computer Engineering

  16. SDP Presentation User Feedback www.sparkfun.com 3 x ROB-08449 Vibrating Motor • Closer obstacle - stronger vibrations • Vibrating pad location - obstacle direction • Alternative Feedback - Audio Jack Electrical and Computer Engineering

  17. SDP Presentation Prices Electrical and Computer Engineering

  18. SDP Presentation Proposed MDR Deliverables • Demonstration of Ultrasonic Detection • Block Diagram 2 • Ultrasonic Transducers • Transducer Microcontroller • Vibrating Motor Array • Principles of Laser Detection • Laser and Camera • Computer Processing Electrical and Computer Engineering

  19. Gantt Chart of STEVI

  20. Thank You Electrical and Computer Engineering SDP Presentation 20

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