4 ms·
There absolutely were popular-ish toys in which a spinning line of LEDs wrote messages, at least a few years ago in Brazil. I can't find a reference.
by emiliobumachar 4y ago
There absolutely were popular-ish toys in which a spinning line of LEDs wrote messages, at least a few years ago in Brazil. I can't find a reference.
- wongarsu 4y agoIf you pack the LEDs more densely, you can display images as well, and in front of the right background it somewhat looks as if it was floating in the air. This makes them somewhat popular for advertising. The first one one google is https://holocircle.com/en/ https://holocircle.com/en/ but you will readily find devices on Amazon or at the retailer of your choice if you search for "hologram fan" or "hologram projector"
- zimpenfish 4y agoI worked for a company back in 2009-10 that was trying to make giant (8ftx12ft ish) LED billboards by using 6 spinners with LED arms that overlapped (IYSWIM.) Only saw it spin up once and it terrified me - all the wheels had to be chain-linked and -driven because they'd tried keeping 6 motors synced up at the same exact speed whilst spinning round hefty 4ft propellors and it just led to the arms hitting each other and "rapid unscheduled disassembly" - not what you want for your roadside adverts. They also made huge cylindrical ones that were actually deployed at a few places in London and around the UK. Never really took off because the mini-PCs inside[1] tended to shake themselves to bits after a few months of spinning around at 4000rpm. [1] I obtained my first Mac Mini from them free because they'd tried that in a cylinder, the hard drive Did Not Like It, and they were just throwing it away.