sweet idea! Reminds me of the guy who uses echolocation to "see". He is completely blind, yet can ride a bicycle without hitting anything. He clicks his tongue and listens to it bounce.

Wow!

Proves the human organism can meet the aiding technology more than half way!

cool

The tech is certainly available, or very close to it. I just saw an app that takes your heart rate by putting your finger over your iPhone's LED flash and camera.