At 01:04 PM 6/12/97 +0100, you wrote:
>Hi,
>
>   I'm building a 16C84 based device that uses a headup display and
>want to detect the blinking of an eye for input. One method may be to
>use a minature LED and photosensor to detect the difference in reflection
>as the eye blinks. Has anyone any ideas on the best approach to this
>problem - I'd prefer a method that didn't make me blind, if possible.
>
>              Geoff.

 There was a beyond 2000, or next step (TV show) that showed some cameras
that would focus on what the person was looking at by using and LED to read
the position of the pupil. I think it was kodak or poloroid, maybe you
could get some good ideas from a camera shop. Or you could attach a self
stick electode just to the side of the eye and watch for minisule mussle
changes (not very practicle).

Glen Benson