Students at the Northeastern University have put up a video demonstrating what would appear to be a very inexpensive technology that can detect free-form gestures above a surface in 3D-Space. The device uses copper plates which emit harmless electrostatics to detect the position and motion of hands near or several inches above the surface.
This would be a fun technology for hobbyists at this point and may have some interesting commercial applications. From what I can tell the device could be mass produced and sold for under $100.00 given the simple materials and electronics involved.
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