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Navigational Aid for a Blind Deaf Individual

Navigational Aid for a Blind Deaf Individual. Konrad Ahlin Ben Davidson Bob Evans Jackson Lamp David Sachenik Rob Steigerwald David Yip. Design Goals. Able to communicate effectively with deaf blind individuals Weight cannot exceed 4 ounces Must fit within a 4 x 2 x 1 inch volume

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Navigational Aid for a Blind Deaf Individual

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  1. Navigational Aid for a Blind Deaf Individual KonradAhlin Ben Davidson Bob Evans Jackson Lamp David Sachenik Rob Steigerwald David Yip

  2. Design Goals • Able to communicate effectively with deaf blind individuals • Weight cannot exceed 4 ounces • Must fit within a 4 x 2 x 1 inch volume • Must be reasonably inconspicuous • Will track position using RFID tags • Power must last for ten twenty minute uses • Cost to produce must not exceed $700 *antenna not counted in weight and size requirements

  3. Concerns • Volume Constraints • Weight Constraints • Heat Dissipation • Attaching device to belt • Program Accuracy • PCB Design and Functionality

  4. Size of Components

  5. Size of Components Cont’

  6. Outer Dimensions

  7. Weight of Components

  8. Power Consumption Battery is 3.7V, 1100mA*hr, 4.01W*hr

  9. Heat Analysis – Hand Calculations • Conduction caused by air: • Section of chip 0.1” x 0.1” • A=6.45*10-6 m2 • Q= -KA (dT/dx) • QTotal=1.6W • QPart =1.6W/210 = 0.00762W • K= (about) 0.0257 Wm-1K-1 • dT/dx = Q/(-KA) • dT/dx = 0.00762/(0.0257*6.45*10-6) = 45969 degC/m =649 degF/in =64.9 degF/0.1in Air Chip

  10. Heat – Experimental Results Null hypothesis: Average temperature < 120 deg F 95% Confidence Alpha = 0.05 Mean=113.9 P-Value=1.00 Fail to reject null hypothesis

  11. Heat – Analytical Analysis Case thermal conductivity = 0.2 Wm-1K-1 Outside case temp set to 20 deg C Top of chip set to 54 deg Celsius (130 deg F) Bottom of chip insulated

  12. Functional Decomposition 5) Receive Map Info 11) Compare current to map 18) Deliver Non-Prompted Information to User Via Haptic Feedback 20) Off Path 1) Region Map Connectivity of Modular Devices 21) Hardware Health 15) Monitor Hardware Health 12) Record location history Battery Life 6) ID current location 22) Movement Instructions 2) Nearest Tag ID(s) Turn 16) Calculate next movement instruction 13) Calculate path 19) Deliver Prompted Information to User Via Haptic Feedback Navigation Loop Destination Arrival 23) On Correct Path 7) Receive User Input 3) Destination 24) Button Pushed 17) Estimate Remaining Distance 25) Estimated Remaining Distance 4) User Input 8) Determine Orientation (Compass) (MCU: Define Interfaces with Power, User Input, Map Input, RFID Reader, Magnetometer, Output Drive Circuitry) 10) On-Board Power 14) Regulate Power 9) Charging Power Enclosure: Support & Manage Internal Components

  13. Final Design • Design elements kept from previous years • RFID tag and reader • Keypad input • Changes from previous years • Vibratory haptic feedback • Two motors for directional feedback • One motor in base unit for input confirmation • Modular belt design • Two motors • Base unit with keypad • Separate antenna

  14. Schematic of Build (outer case)

  15. Schematic of Build (Battery)

  16. Schematic of Build (RFID)

  17. Schematic of Build (PCB)

  18. Schematic of Build (Keypad)

  19. Schematic of Build (Cover)

  20. Schematic of Build (Motor Case)

  21. Procedure of Build • Week 1 • Motor Testing (without case) • Antenna Testing • PCB Prototyping Board • Week 2 • Finalize design and build motor case • Motor Tests (with case) • Testing of Magnetometer • Order Wiring and Belt • Week 3 • Order Base Case • Test Keypad

  22. Procedure of Build Cont’ • Week 4 • Test PCB • Start design for part placement in case • Order spacers and insulation for case • Have developed program to start testing • Week 5 • Re-machine Case and continue fitting parts • Test connections and interactions between MCU and other devices • Order PCB • Week 6 • Test Durability of general design • Finish Full Build • Week 7 • Application testing of device • Week 8 – 10 • Presentation Set up

  23. Haptic Feedback Motors Navigation Feedback Input Confirmation Pico Vibe 12mm Vibration Motor - 3.4mm Type • Precision Haptic 10mm Vibration Motor - 15mm Type

  24. Motor Tests • Volt Step Testing • Orientation Testing • Case Material Testing • Duty Cycle Testing • Applied Force on Case

  25. Motor Testing Results

  26. User Inputs

  27. Outputs to User (Automated)

  28. Outputs to User (User Generated)

  29. Testing of Total Design • Heat • Internal Temperature must be less than 120 degrees Fahrenheit • Drop • Must be fully functional after a free fall drop from 3 feet • Guidance • Must accurately guide an individual from any location on the second floor of Building 9, to any designated location

  30. Testing of Total Design (cont’) • Battery Replacement • Must take less than 1 minute • Charge Time • Charges in 8 hours or less • Power Consumption • Can Run for at least 200 minutes on 1 charge • Removal and attachment of device • Less than 1 minute

  31. P12015: Bill of Materials

  32. Project Timeline

  33. Risk Assessment • MCU Lead Time Taking too long • Motors Vibrating too had for leads • Motors Burning Out • Fails Drop Test • Keypad Lead Time

  34. ? Questions

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