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You can check out this tutorial here for a more detailed explanation w/ pics: http://permadi.com/1996/05/ray-casting-tutorial-table-of-contents/
Dot Matrix Printer from a CD/DVD Reader with Arduino
Laser Flashlight Hack!!
Pocket laser engraver.
Internet Controlled Car
DELTA TWISTER: A DIY 3D PRINTER ANYONE CAN MAKE (FOR LESS THEN 400 BUCKS)
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