Thanks Mathias, this answers my question :) But then developers will have a tough time to find which device uses 'fused' sensors in what way ( possibly getting the details from manufacturer ), if they need to care this for some reason. Like in my case I wanted to confirm that Nexus S do not use gyroscope for fused sensors.
How about making this info. available through API itself for each sensor events ? Just a thought. Thanks. On Mar 17, 12:56 am, Mathias Agopian <[email protected]> wrote: > Hello, > > TYPE_ACCELEROMETER uses the accelerometer and only the accelerometer. > It returns raw accelerometer events, with minimal or no processing at > all. > > TYPE_GYROSCOPE (if present) uses thegyroscopeand only thegyroscope. > Like above, it returns raw events (angular speed un rad/s) with no > processing at all (no offset / scale compensation). > > TYPE_ORIENTATION is deprecated. It returns the orientation as yaw/ > pitch/roll in degres. It's not very well defined and can only be > relied upon when the device has no "roll". This sensor uses a > combination of the accelerometer and the magnetometer. Marginally > better results can be obtained using SensorManager's helpers. This > sensor is heavily "processed". > > TYPE_LINEAR_ACCELERATION, TYPE_GRAVITY, TYPE_ROTATION_VECTOR are > "fused" sensors which return respectively the linear acceleration, > gravity and rotation vector (a quaternion). It is not defined how > these are implemented. > On some devices they are implemented in h/w, on some devices they use > the accelerometer + the magnetometer, on some other devices they use > the gyro. > > On Nexus S and Xoom, thegyroscopeis currently NOT used. They behave > as if there was no gyro available, like on Nexus One or Droid. We are > planing to improve this situation in a future release. > > Currently, the only way to take advantage of the gyro is to use > TYPE_GYROSCOPE and integrate the output by hand. > > I hope this helps, > > Mathias > > On Mar 13, 3:03 am, Pritam <[email protected]> wrote: > > > Could someone help to know which sensor uses which part of phone's > > hardware or in what combination of this on Nexus S in android 2.3 ? > > > Following are the sensor events: > > > TYPE_ACCELEROMETER > > > TYPE_GYROSCOPE > > > TYPE_GRAVITY > > > TYPE_LINEAR_ACCELERATION > > > TYPE_ORIENTATION > > > TYPE_ROTATION_VECTOR > > > I assume first 2 corresponds to separate hardware (accelerometer and > >gyroscope), > > > but how with the other remaining ones ? > > > Does TYPE_LINEAR_ACCELERATION uses both Acceleromter andGyroscope > > hardware at its best? > > > I am actually interested in "linear aceleration" so should I need not > > worry about gyro events, if "linear acceleration" internally uses gyro > > to give out values ? > > > Also when tested on device ( Nexus S ) linear accelerations found to > > give high values for minor shakes , so assuming this removes gravity > > vector, this was not expected. > > > Thanks. -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
