This is a design for an open-source prototyping shield for Arduino Uno / Mega / Duemilanove. It has tons of cool features, to make prototyping on your Arduino easy.
Features:
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Reset button up top
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ICSP header
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Lots of GND and +5V rails
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DIP prototyping area makes it easy to add more chips
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SOIC prototyping area above USB jack for up to 14-pin SOIC chip, narrow medium or wide package.
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A 'mini' breadboard included
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Extra 6mm button
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Compatible with: Arduino Uno, Mega, Duemilanove, Arduino NG, Arduino Diecimila.
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Tutorial using Proto Shield for LED