EE396: PDA

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EE396 PDA

• Alex Zamora

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Project Overview

• Intend to build a touch-screen PDA that can read
  and write files.
• Main purpose To have an organized non-paper
  based notebook for taking class notes.

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Idealistic Origins

• To have a 8.5 x 11 inch display
• To use Electronic Paper Display
• To Create Motherboard from Scratch
• To have USB storage
• To use an EMR touch-screen
• To have internet Connectivity

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Tragic Reality

• 8.5 x 11 inch screens are too expensive
• Settling for 7.8 inch (diagonal) screen
• EPD is too expensive
• Settling for LCD
• Using Prefabricated Motherboard
• This is the smart thing to do
• Using Resistive Panel Touch-screen
• Found a Package Deal

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Reality Continued

• Will use USB storage
• External Flash Drive
• Internet Connectivity Is Still a Possibility
• Not a priority

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Processing-The Gumstix Way

• Using Gumstixs Connex 400xm
• 400MHz (Intel XScale PXA255)
• 16 MB RAM
• 60 pin I/O connector
• 92 pin Bus Header
• Using Gumstixs Breakout-gs
• USB

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Gumstix Advantages

• Linux OS preinstalled
• USB drivers
• Familiar Programming environment
• Many types of Expansion Boards
• WIFI
• Ethernet
• USB

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Display

• Panasonic EDMGRB8KJF
• Color LCD 640 x3(RGB)x480 pixels
• Passive Matrix (slower than Active)
• 7.8 inch (measured diagonal)
• LCD Active Area 118.06 x 157.42 mm
• 70Hz Frame Rate

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Display Gumstix Interface
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Touch-Screen

• DynaPro four wire resistive TTP
• Graded resistance in X and Y directions
• Screen returns voltage depending on position
• Use ADC and calibrate manually
• There is a linear dependence

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Next Semester

• Build it
• Program it
• Flaunt it

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ANY QUESTIONS?

• PS
• Website www2.hawaii.edu/azamora/projects