mobile

I wonder if there is something else you can do with that heart rate sensor?
It uses a red-led as a light source so I guess it works exactly like these apps that use the LED-flash.
So I guess it's some kind of a light sensor too. Can't it be utilized as an additional focusing engine for the camera or something? Or for infrared/ultraviolet/whatever camera tricks. Or to lock/unlock your phone?

Any ideas?

Cheers.