This nifty automated white board basically takes "text input from the internet and plot[s] it onto a white board for the world to see." Video after the break. Click here for one more picture.
If the pen needs to be 'down', the electromagnet will actuate and gravity will push the tip of the pen down to the surface of the whiteboard again. The electronics aren’t that complex: the main task is to make the stepper motors and the solenoid controllable by a PC[via HackedGadgets]
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