Gyrometers measure the rotational acceleration if I'm correct (i.e. a
gyrometer attached to a rotor spinning at a constant speed would give
"zero" output, if you sped up or slowed down the rotor you'd get
positive or negative outputs.  I think you want either an inclinometer
or an accelerometer here.

  The Analog Devices ADXL202 would be good here, probably.  If you only
need one axis look at the ADXL05.

  Or use the old ball bearing in a cage (or pendulum with a rnig
contact) if you must go low-tech <VBG>

  Mark Willis, mwillis@nwlink.com

Harrison Cooper wrote:
>
> I was reading some old email on this, and maybe I am confused about
> these.  If I want to measure a difference in tilt angle, to set an alarm
> off if the angle was greater than a preset value.  Or is there a better
> device to use?
>
> > > SONY accelerometers
> >
> > Sorry, but those are not accelerometers, they are gyrometers, more
> > exactly, gyration rate change sensors ((delta - angle)/(delta -
> > time)).
> > They can't be used as accelerometers normally, but the CAN be used to
> > control something that pivots about an axe (such as a pendular device
> > -
> > Morgan is your thing pendular ?). They can also be used in an inertial
> > reference system for a rotary device or inertial compass (gyro
> > compass).
> > They suppress the unwanted axes pretty well so no shortcuts there.
> >