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If you're looking to chat with those on the "other side," might as well do it with Arduino!
Today we have a great project from SparkFun Engineer Joel - the Arduino-Controlled Ouija Board! Just in time for Halloween, this project combines some Actobotics parts, a couple of stepper motors, an Arduino dev board, some magnets (how do they work?!) and some other bits and pieces to create an X-Y table that is guaranteed to spook your friends. Check it out:
If you want to build your own, you can download the firmware here - and here is a wishlist of the parts involved: