When the device is still Each axis is 0, but in reality, do not forget that there is a force of gravity. Therefore, the value of Accelerometer It is not a time 0 is not moving. If we set the Z axis is perpendicular to the ground, the X and Y axis, Z will be 0, but not 0 because of the gravity of the action. The value of the Z axis is 9.8 m / s ^ 2, but it is the ideal.
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