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Navigation Aid for the blind

Navigation Aid for the blind. P12015. Faculty Guide : Dr . Beth DeBartolo .

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Navigation Aid for the blind

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  1. Navigation Aid for the blind P12015 Faculty Guide: Dr. Beth DeBartolo This material is based upon work supported by the National Science Foundation under Award No. BES-0527358. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author and do not necessarily reflect the views of the National Science Foundation.

  2. Our Engineering Team From Left: Bob Evans Electrical Engineer David Sachenik Electrical Engineer Jackson Lamp Computer Engineer David Yip Electrical Engineer Ben Davidson Mechanical Engineer Rob Steigerwald Industrial Systems Engineer KonradAhlin Mechanical Engineer

  3. Project Description • Creation of a device that allows a vision/hearing-impaired individual to easily navigate to a location in an unfamiliar building. • Our device understands locations by recognizing various passive radio-frequency identification (RFID) tags that are placed by doorways, restrooms, water fountains, and other areas of interest. • The navigation algorithm calculates and determines the quickest routes to user inputted destinations. • Complete prototype is user friendly, comfortable, and hands free.

  4. Project requirements •Battery Charge time less than 8 hours •Interchangeable Battery •Non-visual Commands •Generates less than 50 dB Noise •Attachment Time less than one minute •Impact Resistant •Lightweight •Reliable

  5. Electrical Design Central Processing Unit: • MSP430F5438A Microcontroller Determines Heading of User: • LSM303DLH Magnetometer Determines Location of User: • SkyeTekSkyeModuleM9 RFID Reader Power Source: • Polymer Lithium Ion Battery – 1000mAh

  6. Electrical Design RFID Reader Antenna: • HyperLink Wireless 8 dBiFlat Patch Antenna User Input Device: • 3x4 Numerical Matrix Keypad Defines Locations Within Building: • Alien-Higgs Passive RFID Tags 840-960MHz Provides Feedback to User: • Precision Microdrives 10mm Vibration Motors 400mA

  7. Electrical Design PCB Layout

  8. Software Design Two Step Navigation Process: 1.) Path Finding: • Implementation based on Dijkstra’sAlgorithm • Path is stored for use by the path following algorithm • Re-run whenever the user wanders off course 2.) Path Following: • Currently a work in progress • Interprets data generated by the path finding algorithm to guide user to guide user to destination

  9. Software Design Management of Peripheral Devices: • Custom Interface for Keypad • Uses a sequence of pulses to scan each column of keys • SPI Interface for RFID Reader • Uses a packet based, request-response protocol • Current implementation can return a list of detected tag IDs • Challenging to implement, caused delays in • I2C Interface for Magnetometer • Uses a register based protocol • Raw data needs to be converted into a heading value using trigonometry • PWM Output for Vibration Motors • Used to control intensity of vibrations programmatically • State base controller used to control output sequences

  10. Mechanical Design Main Case: • Slide allows for easy battery access • Top cover holds keypad in place • Main body holds PCB, RFID reader, and battery in place Motor Cases: • Transmits vibrations • Allows offset mass to rotate Belt Enclosure: • Ergonomically designed • Properly secures components

  11. Results/Demonstrations • Motor Feedback Interaction • User Keypad Inputs • RFID Tag Recognition • Magnetometer Heading • Assembly of Device

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