Douglas Butler wrote:
>
>Might I suggest an accellerometer package such as a 3 axis Crossbow.  It
>is small and light and costs about US$300.  The user could swirl his/her
>head to turn pages foreware and backward.  Various nods could also be
>decoded.  I think it could be very intuitive.
>Check out www.xbow.com product CXL04M3.
>

Another non-contact alternative that might be worth considering is
ultrasonic sensing for head movements.

As I recall, a member of the Forth Interest Group (David Jaffe, I believe)
did a lot of work on this with Stanford Hospital or perhaps with one of its
clinics.

He used Polaroid ultrasonic ranging units to sense head movements which then
controlled an electric wheelchair's speed and direction.

Regards, Bob


_________________________________________________________________
Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads