Israeli tech entrepreneur Ran Poliakine has developed the Tap Strap – a wearable device that senses finger movements and translates them into text from any surface to any smart device. The Tap Strap sends a character or command to a device based on which fingers touched the surface.
http://www.fromthegrapevine.com/innovation/tap-strap-can-turn-any-surface-keyboard-ran-poliakine#!