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LSM303AGR - how to remove raw data distortion?

Question asked by Wojciech Jasiewicz on Jul 2, 2018
Latest reply on Jul 9, 2018 by Miroslav B

Hello, erveryone

I have a question about raw data correctness. I read raw data from magnetometer. I reached following results after rotated this around Z axis in horizontal, flat plane, data are expressed in gauss:

Red - X data, Green - Y data, Blue - ellipse.

I know that this data set isn't correct. I see that parts of data set are flipped. When I converted it (moved parts of sine and cosine), I reached following results:

 

It looks more correctly than previous chart. What is the reason of data distortion from first picture? I used X-NUCLEO-IKS01A2 Motion MEMS and Environmental Sensor | Mbed to collecting data from sensor. I assumed that this library is correct.

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