I think that there are some issues with the earth Gravity, so I wonder if there are any examples where the accelerometers work by subtracting these.
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I think that there are some issues with the earth Gravity, so I wonder if there are any examples where the accelerometers work by subtracting these.
(It’s too bad you can’t file a bug with planet Earth to fix its Gravity issue!)
There are several examples listed under “Related sample code” in the UIAcceleration Class Reference.
As that doc states, a value of 1.0 represents roughly +1g. So if you point the iPhone straight up in portrait orientation, you should see roughly <0, -1, 0>. As you rotate the phone around, the magnitude of the acceleration vector
sqrt(x*x+y*y+z*z)should stay around 1.