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A ATTiny24 is running the show here. This POV Wheel Display for a Longboard from ch00ftech looks like it took quite a bit of time to put together. Those tiny surface mount parts on the home made board must have taken a steady have to get right! There are more LEDs than microsontroller outputs but instead of using a serial to parallel chip to do the work the LEDs are matrixed.
Via: Hackaday