IOf you use a 3 axis device and do the math it will work. Think vectors. At rest the system will measure a 1 G down. When breaking a breaking acceleration will be added in as another vector so you should be able to remove the 1 G and get a resultant vector.Team 190 from WPI did that a few years ago on their First robot when we put in an inertial navigation system.
Larry
> 
> From: "David Van Horn" <dvanhorn@microbrix.com>
> Date: 2005/08/31 Wed PM 04:21:45 EDT
> To: "Microcontroller discussion list - Public." <piclist@mit.edu>
> Subject: RE: [EE]: Looking for method to differentiate gravityfromacceleration
> 
> > 2) If the car is on a banked surface then the device may think the car
> > is going downhill since the perpendicular will read less than 1G.  In
> > this case the light would not come on if you did brake slowly.  A
> > three axis accelerometer would remedy this.  Might only matter at the
> > race track and some highway entrance and exit ramps.
> 
> Would it work in San Francisco?
> 
> :)
> 
> 
> 
> 
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