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Some AVR assembler in a GCC program can speed up execution, particularly interrupt service routines.
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A toy that activates when moved and displays pretty LED patterns. Guaranteed to entertain any child for at least 5 seconds.
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Flashing LED Toy

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512 LEDs driven by an Arduino via eight shift-registers and eight MOSFETs
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8x8x8 Blue LED Cube

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30ml jam jars turned into beautiful LED displays - nixietube like looking without the higher voltage fuzz
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Fixietube - Fake Nixie Tube displays

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A small, flexible boat and controller system able to travel where a standard boat could not go.
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DIY Airboat and Controller

compucatCompuCat

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