Sight for Sore Eyes

1. Goal: Total Cost: • Produce a prototype Braille display • Four Characters • Utilize electrical stimulation (Total Cost of Development)Voltage Boost Chips: $20 Passive Components: $120 Mounting Boards: $6PWM Controller HC12 Controller: $15 Additional Components: $4Display Surface 3 Trial Boards: $90 Completed Board: $10Constant Current Circuitry Transistors: $15 Discrete Components: $3 _Total: $283 Projected Cost (per unit): ~$185 Total Man Hours: 354 Competition: Technical Details: Conclusions: • Cost of current displays: $2,000+ • Parts are small • Difficult to mass produce • Each Braille cell contains eight dots • Each dot contains two electrodes • Small center electrode sources current • Circular outer electrode closes current loop • Electrodes formed on Printed Circuit Board • Power converted from 5V DC to ~300V DC • Stimulation by high-frequency pulses • Optimal waveform characteristics determined through testing • Micah • Please • Add • Your • Comments • Here Constant Current Schematic Team: Patrick Cunningham Printed Circuit Board Design Jeremy Fox Pulse Timing/Generation Micah Houtz DC Booster Michael Mosley Current Controller Block Diagram of Design Schematic of Voltage Boost Circuit Pulse Waveform to Finger Sight for Sore Eyes Electrotactile Braille Display