Hi. I am using a 3 axis accelerometer for motion detection. I can easily determine the tilt using simple triginometry but cannot determine the movement in a particular direction. For example the sensor is at 45 degrees to the floor so the x,z coordinates are x = 0.5, z = 0.5. So if I keep the angle constant and move directly up x will stay the same and z might now go to 1 or even more. But x = 0.5, z = 1 is also the same as the device being parallel to the floor. So is it possible to determine both 'dynamic' and 'static' acceleration using one of these devices or would I have to use more? Thanks, Mark.