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Object Detection for the Visually Impaired

Justin Rice Christopher Zeh Zac Bond Casey Morford. Object Detection for the Visually Impaired. Motivation. Enhance the lives of the visually impaired through the creation of a wearable tool Locate near and distant obstacles Detect nearby people Create inconspicuous system

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Object Detection for the Visually Impaired

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  1. Justin Rice Christopher Zeh Zac Bond Casey Morford Object Detection for the Visually Impaired

  2. Motivation Enhance the lives of the visually impaired through the creation of a wearable tool Locate near and distant obstacles Detect nearby people Create inconspicuous system Eliminate the need for a cane

  3. Design Decisions Ultrasonic transducers to locate objects Pyroelectric sensors to detect people Tactile output using vibrational motors Microcontrollers for processing the inputs and regulating the output

  4. Design Decisions Criteria for choosing sensors Range of detection Angle of coverage Cost Criteria for choosing microcontroller Input and output capability Cost and availability

  5. Ultrasonic Sensors Previous work (Bomber Belt) 15 ultrasonic transducers on belt Sampled sequentially clockwise Communicates serially with PIC that determines time of flight

  6. Ultrasonic Sensors Modification to Bomber Belt system PIC polls only the five front sensors ten timers per second PIC computes a distance estimate for objects to the left, right, and middle Uses predefined thresholds to indicate the relative closeness of objects detected

  7. Pyroelectric Sensors RE200B Infrared detector Differential pair of sensors to cancel out background heat sources Tuned to 8-14 µm for human detection Needs amplifier to boost 20mVpp output Unreliable, but manageable, output

  8. Tactile Display Yokyo Parts FM31E 3 small vibrating motors (1/2 inch diameter) 4500 rpm @ 3V input Requires driver circuit to supply enough current

  9. Tactile Display 3 output motors: left, right, and center 5 vibration intensities Fully off for no objects or people 3 distance based levels Extra pulses for human detection Attached to Bomber Belt in final system

  10. Microprocessors PIC18F242 Time of flight computation for ultrasound Communicates sensor readings serially HC11 with Fox11 Development Board Reads in serial output from PIC Reads in pyroelectric data on input channel Sends control signals to motor driver circuit

  11. Ugly Prototype Demonstration Ultrasonic transducers from the Bomber Belt perform range finding Pyroelectric sensors detect moving people Motors vibrate according to distance All subsystems reside on different boards Wear the belt at your own risk (~400 V pulses)

  12. Future Work PIC and HC11 programs merged onto one device Replace our 3 power supplies and 2 batteries with a single battery pack Sleeker, more stylish design Everything on one board Make it pretty

  13. Questions?

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