see http://www.clock-it.net
A seven segment clock made from 39 separate LEDs, each is individually addressed, using just seven charlieplexed pins. The theoretical maximum for 7 pins is 6x7 or 42 LEDs. To maintain a steady display the LEDs are updated 2048 times each second. The flicker visible here is due to my camera frame rate and the display rate interfering with each other.
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