1. Digital Braille Watch

2. Telling Time Without Sight
Ask another person
Competing Devices
Analog Braille watch
Audible watch
Existing Braille Clock
Braille Numbers
Only top four units used

3. Design Requirements Digital military time with Braille
numbering
Fit on wrist or in pocket.
Accuracy of one minute
Shelf life of 10 years
What happens if/when battery dies?
Power-saving function
Time only shown when activated

4. Previous Prototype Vibrotactile Display Programming Improvements
Four motors
Programming
Delphi5
Improvements
Integrated clock chip
Better touch discrimination

5. Current Design Block Diagram General Overview 5 components
All integrated circuitry
Motor
Motor
Motor
Motor

6. Method of Operation Clock Chip and Crystal Oscillator
ROM Chip constantly tracking time in clock chip
Activation sends time to microcontroller
Microcontroller utilizes program to create usable data

7. Microcontroller Program and Output
Program uses time string to determine specific motors
Converts digital signal to analog
Output sent to vibromotors
Of course, to do all this the user to tell the watch to give them the time A B C D

8. Design Matrix Criteria Possible Designs Safety 5 4 Cost 3 Durability
Considerations
Weight
Flip Cover
Button Under Motors
Separate Button
Safety 5 4
Cost 3
Durability 25 18 22
Feasibility 35 30 32
Ergonomics /
Human Factors 20 23 15
TOTAL
100 71 83 77

9. Future Work and Testing
Basic STAMP program for microcontroller
Point discrimination between the four motors
Power consumption
Vibromotors
Clock chip
Microcontroller
Battery Life

10. Special Thanks To: Holly and Colton Albrecht Previous Design Team
Professor Block
Michael Morrow and Eric Oberstar

11. Questions?