“Hi guys. Wellcome back to a new awesome tutorial. POV or persistance of vision refers to the optical illusion that occurs when visual perception of an object does not cease for some time after the rays of light proceeding from it have ceased to enter the eye. The illusion has also been described as “retinal persistence”, “persistence of impressions”, simply “persistence” and other variations.
In this project we will learn how to use a Hall sensor in order to detect rotations. We will count the time it takes to make a full rotation of the POV propeller and by dividing the measured value by 360 we get time per degree. Next, with a smart code we decide when to turn on and off a line of LEDs in order to draw shapes in the air. The propeller will spin fast enough so the human eye won’t be able to tell the difference and we will se an imaginary fixed shape. So let’s get started.”