Make a POV LED Air Writer for Under $5

You can do all sorts of things with flashing LEDs, and in this simple project, we’ll make a small device that lights up messages in the air when you wave it back and forth. It’s easier than you think, and the total cost of parts is under $5. This project utilises an optical illusion called persistence of vision to make text appear in the air. You’ve probably come across this phenomenon when someone moves a lit sparkler quickly at night. We will be using an Arduino and some LEDs to mimic this effect. This project is simple to build, with...

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