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A dutch magazine called "Computer Idee" had a seperate booklet with this
months issue. It had building instructions (photographs) to build a CD
changer for changing CD-Rs when making multiple copies of a disc. It didn't
look like it was done in cooperation with LEGO, in fact I couldn't find any
reference to the LEGO company at all (except for mentioning "use LEGO to
build this")
Anyway, the device uses a RCX, two motors, a touch sensor and a light
sensor. When the copying is finished the PC ejects the CD-R, this activates
the touch sensor and the CD is removed from the tray. In the meantime a
blank CD-R is pushed from the bottom of a stack of CDs (they used tiles to
make sure only one CD at a time is moved, the stack of CDs 'rest' on the
caterpillar tracks) and the light sensor 'detects' when a CD-R has been
moved from the stack (the edge of a CD-R is detected like a black line), to
stop the motor moving the stack. Finally the CD-R drops in the drawer.
A timed macro on the PC is used to continue the copying process (close the
drawer etc.)
--
Frank Buiting
Visit the LEGO Lexicon: http://members.chello.nl/~f.buiting/lego/
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