At 03:29 PM 8/10/01 -0400, Bob Barr wrote:
>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.

The head could be the center plate in a split capacitor.
Use the value differential to determine position, and can work in two axis
at least.
Almost a charge-transfer sort of thing, but not quite.
--
Dave's Engineering Page: http://www.dvanhorn.org

I would have a link to http://www.findu.com/cgi-bin/find.cgi?KC6ETE-9 here
in my signature line, but due to the inability of sysadmins at TELOCITY to
differentiate a signature line from the text of an email, I am forbidden to
have it.

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