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I have a way to control 2^n leds with n pins, for exemple if you have 16 leds, you can encode a binary number with 4 bits and use a decoder to convert it to decimal and turn on the specific led at the speciefed position (0101 will turn on the 6th led (because 0000 is the 1st)). But you can just turn on 1 led at a time or few of them by switching very fastly between them so they will blink as fast as it can't seeable by eyes!
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