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How to drive a lot of LEDs from a few microcontroller pins.

Step 5Itty bitty

Itty bitty

Microchip of course has their 6 pin PIC10F chips, capable of driving a
mere 6 LEDs from the 3 output pins. This is about 16mm in diameter.
Going to 603 LEDs lets you get a bit smaller, but I'm not sure what's the point.

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