Transcript 2/15/2012 - Purdue College of Engineering

Team Scribacious Rabble
Hardware Design
William Hess
Paul Rosswurm
Mitch Erdbruegger
Ben Kobin
Project Description
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Adaptation of the board game SCRABBLE®
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Maintains the traditional physical tile interface...
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augmented by ..
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Sensing tile location and value
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Automatically calculating and displaying scores
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Maintaining player profiles
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Validating words in the event of a 'challenge'
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Exposing game stats over an external interface
Schematic
Design - PIC24
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Decoupling capacitors as
recommended
24MHz operation
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Internal FRC oscillator
Stepped up to 48MHz to
meet USB spec
MPLAB ICD3 Interface (RJ11)
Extra pins on headers
Design - USB
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Polarized Molex connector on board
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Device mode
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VBus is an input (and PIC can handle up to 5V)
Design - Memory
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MicroSD card – serial interface
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SPI Master mode at 24MHz (low speed SD)
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1 Data line
Design – LCD
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SPI
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Channel 0 shared with memory
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Common reset
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PWM not yet put into schematic
Using driver similar to TLC5929DBQ
Design - Sensors
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Select row, time entire column
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75 rows
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15 columns
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Use open drain shift registers to select row
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BU290 (12 bit)
3.3V applied to every column
Voltage across column of capacitors fed through
optoisolators to timer module
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Optoisolators need to have low latency
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TLP2066(F)
Design – Sensors (cont.)