31-10-2014, 02:17 PM
Abstracts: Propeller clocks use an idea called POV, Persistence Of Vision, which means that if something appears in the same spot consistently, at least 50-60 times per second, our brains think that it's permanently there when it really is not. TV's and Monitors use this method of display, so it's not as uncommon as you might think. Propeller Clock" is a mechanically scanned LED clock with seven light emitting diodes that spin, giving the illusion of numbers floating in the air. A motor spins the "propeller", and a small microprocessor keeps track of time and changes the pattern on seven LEDs with exact timing to simulate a array of LEDs