Why 2 accelerometers?

[RANJAN]

On Fri, Sep 18, 2009 at 8:35 PM, Al Johnson
<openmoko at mazikeen.demon.co.uk>wrote:

> On Friday 18 September 2009, RANJAN wrote:
> > Hi,
> >
> > I was wondering why FR has two accelerometers.They could have one 3 axis
> > accelerometer and a single angular rate gyro.How is a combination for 2
> > accelerometers more useful than one 3 axis accelerometer and a gyro?
>
> Or, better, use a 3-axis magnetometer instead of a gyro.
>
> At the time the FR was designed, gyros were significantly more expensive
> and
> less available than accelerometers, and magnetometers were large and even
> more
> expensive. Spaced accelerometers sounded like a good way of getting most of
> the way there while still being affordable. In practice it doesn't work so
> well. In the meantime gyro and magnetometer prices have tumbled.
>
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I think when FR was designed the Gyros costed around USD 17 .Is there a next
version of Openmoko phone being designed?

Sriranjan
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