You can also buy expensive mechanical pendulums ($100 for one) that
output a standard gray code (like a rotary encoder) with an index pulse.
http://www.usdigital.com/products/t2/
http://www.usdigital.com/products/a2t/

Then there are capacitave sensors.
http://www.maxim-ic.com/appnotes.cfm/appnote_number/198

For my most recent design I'm using an ADXL213, which should be good to
1/10 of a degree through its range, but with very slow response time
(1Hz bandwidth).  Once you start needing faster updates the resolution
drops quickly.

There are companies that have done all the hard work (temp compensation,
sensor testing, etc) and have drop in modules to do what you want for $90.

-Adam

Shawn Mulligan wrote:

>I'm working on a sensor pack which will measure azimuth, inclination and
>roll. Currently I'm involved in literature review and parts specification
>with a leaning towards Honeywell's magneto-resistive magnetometers and an
>Analog accelerometer. Both Honeywell and Analog provide excellent
>application notes and support, but the input of any board members would also
>be appreciated, specifically direction to further online research sources.
>
>Thanks, Shawn
>
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