Michael Ciuffo of Ch00ftech built this tiny persistence-of-vision display, based on an Attiny24, to fit on his skateboard’s 72mm wheels.
One of the benefits of doing a display on a longboard as opposed to a bike is that during regular use, a longboard wheel rotates many more times per second than a bike wheel. This means that it’s much easier to attain a high enough refresh rate to achieve persistence of vision. Instead of using the four arrays of LEDs like in the MonkeyElectric display which effectively refresh the image four times per rotation, I would only need one array of LEDs to refresh it once per rotation.
[via Embedded Projects]