Harrison,

        There are a lot of options here, you can use encoders, capacitive trandu
cers,
precision pot, accelerometers, etc...
        For encoders U.S. Digital makes great ones (and cheap).
http://www.usdigital.com
        Capacitive : Lucas (AccuStar Electronic Clinometer)
        Pot: Midori Precision, Spectrol (BluePot)
        Accelerometers: CrossBow http://www.xbow.com
        The interface can be digital or analog and resolutions are all at your t
aste.
        Right now I'm trying to implement a level sensor with hall sensors.

Hope this helps

Ricardo Seixas

>A while back, there was some discussion on tilt sensors.  I
>followed it from a distance, but you know how things are, you
>don't pay attention unless you have a current requirement. Now
>I might have one for these tilt sensors, but I don't remember what
>was found, and are they digital output or analog?  I am thinking
>of putting something together that sets an alarm if either the
>X or Y axis tilt further than some n degrees (preset).  Did anyone
>save this information?
>
>Harrison Cooper
>Sr Design Engineer
>Evans & Sutherland Computer Corp
>Salt Lake City, Utah
>www.es.com
>
>