Hi Rud, I just finished reading all on your blog. For your reply to my first question, how Android computes the orientation from the acceleration. I think only one article is sort of related to my question, which is
13 July 2009 Sensor - Accelerometer & Magnetics But...er...sorry, I can't really see how Android does the internal calculation. What I want to know is not really how we later process the orientation and acceleration, but how Android computes the orientation readings in the first place, because I think there's no such a seperate sensor to detect the orientation, right? Also, from my data analysis, it shows that there is always a time mismatch between change of acceleration and change of orientation, and it seems that the change of orientation that corresponds to the change of acceleration is always triggered after the change of acceleration. The reason why I need to know this is that I want to do the reverse engineering to compensate the gravity decomposed onto x,y,z axis by using the orientation at the same time instance and geometric formulas, so that I could cancel out G, because the accelerometer readings show that G is automatically decomposed when the phone is tilted. My target now is just to get rid of G.... On Oct 5, 10:04 am, Rud <rudmerr...@gmail.com> wrote: > See my blog for code to do the > processing:http://mysticlakesoftware.blogspot.com/ > > Rud > > On Oct 4, 7:57 am, DD <daviddiaofri...@gmail.com> wrote: > > > > > Hi, > > > It seems that for onSensorChanged(), the orientation readings > > (yaw,pitch,roll) are not detected directly, but computed from the > > acceleration readings. Does anybody know how they do this calculation? > > is it by rotationmatrix..? May I know exactly the calculation process? > > > Thanks!- Hide quoted text - > > - Show quoted text - --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~----------~----~----~----~------~----~------~--~---
