1. Team Scribacious Rabble
Hardware Design
William Hess
Paul Rosswurm
Mitch Erdbruegger
Ben Kobin

2. Project Description Adaptation of the board game SCRABBLE®
Maintains the traditional physical tile interface...
augmented by ..
Sensing tile location and value
Automatically calculating and displaying scores
Maintaining player profiles
Validating words in the event of a 'challenge'
Exposing game stats over an external interface

3. Schematic

4. Design - PIC24 Decoupling capacitors as recommended 24MHz operation
Internal FRC oscillator
Stepped up to 48MHz to meet USB spec
MPLAB ICD3 Interface (RJ11)
Extra pins on headers

5. Design - USB Polarized Molex connector on board Device mode
VBus is an input (and PIC can handle up to 5V)

6. Design - Memory MicroSD card – serial interface
SPI Master mode at 24MHz (low speed SD)
1 Data line

7. Design – LCD SPI Channel 0 shared with memory Common reset
PWM not yet put into schematic
Using driver similar to TLC5929DBQ

8. Design - Sensors Select row, time entire column 75 rows 15 columns
Use open drain shift registers to select row
BU290 (12 bit)
3.3V applied to every column
Voltage across column of capacitors fed through optoisolators to timer module
Optoisolators need to have low latency
TLP2066(F)

9. Design – Sensors (cont.)