The gyroscope, or gyro for short, adds an additional dimension to the information supplied by the accelerometer by tracking rotation or twist. Accelerometers in mobile phones are used to detect the orientation of the phone. An accelerometer measures only the linear acceleration of the device whereas a gyroscope measures the orientation of the device. Now the question is why do we need a gyroscope when we already have the accelerometer. An Accelerometer can measure linear acceleration relative to a frame of reference.
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