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This joystick-controlled machine draws light trails using a laser
Lasers are awesome. Glow-in-the-dark surfaces are, too. As seen here, Justin and Brett were able to combine the two into an excellent drawing machine made from scrap materials and discarded wood.
Their device uses a pair of gearmotors under Arduino control to actuate a rack-and-pinion gantry system over a canvas painted with phosphorescent powder. A laser is mounted at the end of this setup, which traces luminescent patterns on the surface as it moves.