29 Aug '17, 11pm

Spell Out the Time with Frickin’ Laser Beams https://t.co/yc2LvEtRof

Spell Out the Time with Frickin’ Laser Beams https://t.co/yc2LvEtRof

What [tuckershannon]’s clock lacks in practicality it makes up for in the gee-whiz department. The idea is simple: trace the characters out on a phosphorescent screen using a laser. To accomplish this, [tuckershannon] adapted the design of this whiteboard marker robot clock , replacing the drawing surface with glow-in-the-dark stickers. A 405 nm laser diode module is traced over the surface by the two-servo pantograph plotter, charging up the phosphors. He offers no clue as to how long the ghostly image lingers, but from the look of it, we’d bet that it lasts for a good fraction of a minute, especially in a dark room. Then again, you’d want the image totally faded before the next write cycle comes up, to prevent overwriting the previous time.

Full article: http://hackaday.com/2017/08/29/spell-out-the-time-with-fr...

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