What I know of (but am to lazy to find the links): - Compass to vibration: a belt that vibrates to north (not really useful, though it reminds me of the aborig

What I know of (but am to lazy to find the links): - Compass to vibration: a belt that vibrates to north (not really useful, though it reminds me of the aborigines that only have cardinal directions, no relative ones like left or right) - IR vision to vision: before cool night vision goggles there where experiments with feeding soldiers some modified proteins or something so their vision would shift towards infrared - remote temperature to audio: http://hackaday.com/2014/03/20/modular-arduino-based-infrared-thermometer/ http://hackaday.com/2014/03/20/modular-arduino-based-infrare... less useful in everyday life but very possible (also both not directed enough. Moving 3 meters to see a change is not direct enough for a feedback loop): - wifi-noise to audio - geiger counter to audio . for people that are missing senses: - color vision to audio (the guy who I know of using this, fights for the rights of cyborgs) - vision to tactile sense (low-res grey scale image to braille like "image" on your back) - sound to nerve stimulation (cochlea implant) - camera to nerve stimulation (some eye prosthesis, currently low res, but relatively new still)