5 ms·
There are little toy fans with 8 or so leds on the blades that do this...show a word while the fan spins.
by tyingq 4y ago
There are little toy fans with 8 or so leds on the blades that do this...show a word while the fan spins.
- samstave 4y agoAns SUPER expensive ones that appear to make a 3D hologram in the air. However, wouldnt it make sense to change the shape from a square to a wedge/arc that more accurately follows the arc of its orbit and resulting in a tighter pitch between scan line?
- Animats 4y agoThere used to be cheap LED wand displays you could wave in the air to display messages. Once popular with ravers.[1] [1] http://www.houseofrave.com/skyliner_message_writer.html http://www.houseofrave.com/skyliner_message_writer.html