Author: Andrei
13/11/2018
Marlon Nardi 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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On the board there is space for an Arduino NANo taht will control everything. Then there is space for a A3144 which is a digital hall sensor meanning it will give a 0 or a 1 when it detects the magnet instead of an analog output. Then there are 10 LEDs each with a 220 ohms resistor to limit the current. And the circuit is pretty much done. To supply power he used a battery.

The Arduino has a 5V voltage regulator. Now we can's see any space for a DC motor shaft. I think he will just glue or drill a hole for that in a future video. For now the board is nice and simple.

So that's it for this POV clock PCB made with Arduino and 10LEDs. With this project you could display numbers and text and by taht make your own clock. Make sure you check Marlon Nardi YouTube channel, and if you want to order very cheap boards, use the services of our sponsor, and order PCBs starting from 2 dollars.