The persistence of vision (POV) optical illusion is pretty common in cheap toys nowadays, but how cool would it be to have your own programmable POV message board? German electronics grad student [Matej] has luckily created an open source fidget spinner with a fully customizable POV display that lets you share whatever thoughts you’d like fellow fidget spinning friends to know.
The displayed graphics don’t rely on rotation velocity, thanks to a solution that tracks the rotation angle. Unlike over POV devices, the POV fidget spinner displays the same graphics at higher and lower rotational speeds, which is useful considering the fidget spinner doesn’t automatically spin at the same rotational speed for every user. It also doesn’t require a constant speed for the image to be displayed correctly, unlike POV fans or clocks.