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Inaccurate pitch and roll readings


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Hi 

I have just started to use the MPU6050 with an Arduino UNO board, connected to a PC.  Using the 6050_DMP6 sketch as basis I am logging the yaw, pitch and roll angles from the ypr output.  However in both cases the angles seem to be scaled.  I read approx 0 to 70 degrees for a 90deg change in both directions.   The max value appears at around 120 deg tilt.  The yaw angle seems more or less correct. 

Is there some scale factor that I need to be aware of, or some calibration other than the initiali stabilisation period?

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