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Could you point out more info about this? I'd like to build something similar, but I'm not sure where to start. It sounds like such a cool project.
by sillysaurusx 6y ago
Could you point out more info about this? I'd like to build something similar, but I'm not sure where to start. It sounds like such a cool project.
- jasonjayr 6y agohttp://ronja.twibright.com/ http://ronja.twibright.com/ Is an old project, that I have memorized the bookmark ('Optar', is another project somewhere on that page that puts a multi-kb 2d barcode data on a printed page to be reliably scanned in, even if damaged)
- codezero 6y agoI wish I could, I'll see if I can dig up my old report from class, but that was from 2007. Very simply, I literally just wired the laser in series with the headphones, like, attached directly to the battery of the laser pointer so the audio +/- 5v would jiggle the laser's brightness around that value (the laser was also +5v so this "just works" if I recall. I might have had a resistor in there, and at some point, current leaked back into my iPod and fried it :) On the receiving end, same deal, PC speaker audio jack attached to a photodiode and power. It's remarkably analog, but it's also the same reason that things like the now anachronistic CD-player cassette adapter work, throwing 5V AM signals around :)