25-year IT veteran by day, maker by night and weekend. Love little fiddly electronic bits and making useful AND useless things for fun and relaxation.

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Charlieplexing is an ingenius method for controlling many LEDs without using many microcontroller pins. You can turn on or off one LED at a time. To light more than one LED at a time, you can scan the LEDs by turning a sequence of them on and off really fast.... Read more »