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Music...with lasers.

Aaron636r

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http://www.youtube.com/watch?v=1bmcx3jD3Bg

Playing the harp isn’t the most high-tech pastime—unless, like Stephen Hobley, you use lasers in place of the strings. Though not the first home-built laser harp, Hobley’s creation is unquestionably the coolest. Played by disrupting the laser beams with his hands, it can produce just about any sound. Better yet, it’s also a fully functioning controller for a version of Guitar Hero.

The harp consists of a box with a power supply, a 450-milliwatt green laser, a mirror and a motherboard. After determining the beam’s frequency, Hobley was able to tune a sensor so it would detect only the laser and not any ambient light. Touching a beam deflects light toward the sensor, triggering software on a PC that translates hand movements into sounds. He also wrote a script that maps notes from the harp to keyboard controls in the videogame.

Hobley is now selling the plans for the harp on his Web site (stephenhobley.com). He says he’s recently had to upload a video of himself playing the game: “It was a direct response to all the comments I got to ‘play Freebird!’”
 

mikeeey

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this one really shows the beams, you get the full idea:
[media width=425]http://www.youtube.com/watch?v=sLVXmsbVwUs[/media]
 
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If the laser is 450 mW, why doesn't it burn his hands when he touches it or damage his eyes if he looks at it?
 

diachi

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Well its split into multiple beams, so Divide the power by the number of beams and then take a little more (10-30mW) off for optical loss, thats why it doesn't burn his hands, the beams are also probably quite fat so they can't burn that well anyway, and he doesn't need to look directly at the dot, because they are at the other side of his hands :p
 




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