>Two axis accelerometer IC (ADXL202 and friends.)
>$US15/1 Digikey.

And you could probably get enough as samples for free from AD.

>Mount horizontal to monitor tilt in a plane.

In this use I always felt that they would perform best so the vertical force
of gravity was at 45 deg to both sensors. Then it may be possible to use a
differential detection between the two sensors without worrying too much
about actual drift of the absolute value.

-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist