Memsic (http://www.memsic.com) makes some single and dual axis accelerometers.  My coworker has their 2-axis demo board ($25) sitting on his desk - pretty cool.

I think one limitation of accelerometers in a 3-D environment is that centrifugal force can play tricks on them.  For example,  in a coordinated turn in an airplane, you're pulling 1G straight down the yaw axis - your roll-axis sensor wouldn't register the roll I don' think.

I want to say that most manufacturers of 3-axis navigation devices combine gyro inclinometers, accelerometers and solid-state compasses with an alogorithm whose name escapes me - to compute very accurate pitch/yaw/roll angles.

Crossbow (www.xbow.com) is one.

-matt redmond




> 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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