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P11017 Tactile Navigation Interface for the Visually-Impaired (VI) and Blind. P11017 Team: Christian Seemayer Robert Proietti Timothy DeBellis Timothy Giguere William Kelly Advisor: Dr. DeBartolo. Today’s Agenda. Project Problem Statement Project Development from Customer Needs - PowerPoint PPT Presentation
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P11017P11017Tactile Navigation Tactile Navigation
Interface for the Visually-Interface for the Visually-Impaired (VI) and BlindImpaired (VI) and Blind
P11017 Team:P11017 Team:Christian SeemayerChristian SeemayerRobert ProiettiRobert ProiettiTimothy DeBellisTimothy DeBellisTimothy GiguereTimothy GiguereWilliam KellyWilliam Kelly
Advisor:Advisor:Dr. DeBartoloDr. DeBartolo
Today’s AgendaToday’s Agenda
Project Problem StatementProject Problem Statement Project Development from Customer Project Development from Customer
NeedsNeeds Built System DesignBuilt System Design
MechanicalMechanical ElectricalElectrical SoftwareSoftware
Testing SummaryTesting Summary Future Project DevelopmentsFuture Project Developments
Problem StatementProblem Statement Objective: Objective: Develop a device to aid the VI and blind in Develop a device to aid the VI and blind in
navigation throughout a building using a tactile interface.navigation throughout a building using a tactile interface. Issues Faced:Issues Faced:
Campus and Classroom navigationCampus and Classroom navigation Predominant use of memory for navigationPredominant use of memory for navigation Current market technology unreliable and expensiveCurrent market technology unreliable and expensive
This is a combination of three Senior Design This is a combination of three Senior Design Projects:Projects:
Intra-Building Navigation Intra-Building Navigation Tactile Navigation InterfaceTactile Navigation Interface Mobile Landmark IdentificationMobile Landmark Identification
Customer Needs Customer Needs
Original Concept DesignOriginal Concept Design
Mechanical System Mechanical System DesignDesign
Housing StructureTop and Side walls
constructed from HDPE and Garolite plastic.
Bottom is rapid-prototyped at RIT Brinkman Lab.
DirectionalityServo-driven tactile pegsTactile pegs made of HDPE
ProximityVibration MotorControlled by MCU to
output 1 second vibrations
Mechanical System Mechanical System DesignDesign
KeypadKeypad Clear bump on “5” Clear bump on “5”
button to understand button to understand # keys locations.# keys locations.
Orange bumps on Orange bumps on side buttons as action side buttons as action keys.keys.
Red rubber bump in Red rubber bump in bottom right acts as bottom right acts as enter key.enter key.
Mechanical System Mechanical System DesignDesign
Attachment Attachment MethodMethod Two elastic band Two elastic band
straps.straps. Velcro attached to Velcro attached to
both at various both at various locations.locations.
Device attaches to Device attaches to user forearm user forearm toward elbow.toward elbow.
Electrical System Design Electrical System Design StrategyStrategy
Individually test Individually test components for components for functionalityfunctionality
Prototype system Prototype system using PIC using PIC development kitdevelopment kit
Create ‘front end’ Create ‘front end’ user inputsuser inputs
Move design to Move design to PCBPCB
Verify power Verify power levelslevels
Electrical System DesignElectrical System Design Built around an 8-bit PIC Built around an 8-bit PIC
C-based microcontroller. C-based microcontroller. Motors controlled by PIC Motors controlled by PIC
and driven by BJT network.and driven by BJT network. Keypad continuously polled Keypad continuously polled
in software, user entry in software, user entry stored in variable length stored in variable length stringstring
String will eventually String will eventually compare to internal map to compare to internal map to provide directional infoprovide directional info
6V rechargeable NiMH 6V rechargeable NiMH batterybattery
Male/Female barrel Male/Female barrel connectorsconnectors
Electrical System DesignElectrical System Design
PCB DesignPCB Design 2 Layer Design2 Layer Design Created and Created and
manufactured manufactured using Express using Express PCBPCB
RIT CEMA RIT CEMA soldered surface soldered surface mount mount componentscomponents
Software Software Embedded C software Embedded C software
written on to PIC18F8722 written on to PIC18F8722 microcontrollermicrocontroller
Prototyping used PIC DevKitPrototyping used PIC DevKit FunctionsFunctions
Continuously polls keypad to Continuously polls keypad to detect user inputdetect user input
Stores user input in string of Stores user input in string of variable lengthvariable length
Compares input to table of Compares input to table of predefined commandspredefined commands
If match occurs, predefined If match occurs, predefined action executedaction executed
Current Predefined ActionsCurrent Predefined Actions Cardinal directions from Cardinal directions from
ServosServos Proximity with vibration motorProximity with vibration motor
Testing SummaryTesting Summary
Future Project Future Project DevelopmentsDevelopments
Structural Ideas Switch from Garolite to HDPE for housing
wall material. Addition of metallic threaded inserts
Prevents stripping the plastic threads Correction of battery gap structural flaw.Software Ideas Addition of Button Lock and Sleep Mode Addition of Cancel Button Change internal clock to reduce time
between inputs Add indicator for acceptable inputs
Future Project Future Project DevelopmentsDevelopments
Possible Design Improvements Research of tubular solenoids
instead of servos. Customized battery and
vibration motor to reduce size. Expanding drawings tolerances
to avoid extra machining. Switch method for creating
bottom housing. Adjustable curvature to provide
better fit for user.
Future Project Future Project DevelopmentsDevelopments
Optimization Ideas Tactile Peg Locations
Locate optimal locations for pegs to reduce spacing Creation of two part device
Part on hand and remainder in user pocket. Reduces size on user forearm, therefore reducing
attention drawn to user. Reduction in device weight.
Wirelessly connected devices Wi-fi or Bluetooth Reduces device wiring
Integration with P11016 Intra-Building Navigation Team project.
Sponsors:Sponsors:National Science FoundationNational Science Foundation
Acknowledgments:Acknowledgments: Dr. Elizabeth Debartolo – Faculty Guide ME Department
Franklin LeGree Dr. Dorin Patru – EE Professor Association of the Blind and Visually Impaired P11016 Navigation Map Team Dr. Marca Lam-Anderson – ME Professor Mr. John Bonzo Dr. Roy Melton – CE Professor Mr. Jeff Lonneville – CEMA Lab Technician
QuestionsQuestions