made this board for a POV or persistance of vision display for a digital clock made with Arduino. The board is simple but the result is interesting. POV systems work like this. A propeller is spinning and will turn LEDs on adn off very fast. Your eye will see the persistance of the LEDs turning on in the same spot and that will result in a line. So by rotating we could create shapes such as letters or numbers. But in order to know how to turn the LEDs exactly in the same spot at the same time, we need to synchronise the system. Marlon dose that using a hall sensor on the back of the PCB and a magnet on the static side of the propeller. By that, each time the hall sensor is in front of the magnet, the system will reset the position.
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