Wrong Magnetometer Data

Hello,
We are using MetaMotionR+ for our research and taking accelerometer, gyroscope, and magnetometer data. However, We found that our magnetometer data is not proper from any sensor although we have 6. the sample data -
elapsed (s) x-axis (T) y-axis (T) z-axis (T)
0 -0.002048 -0.002048 0.000059438
0.039 -0.002048 -0.002048 0.000059438
0.08 -0.002048 -0.002048 0.000059062
0.122 -0.002048 -0.002048 0.000059062
0.161 -0.002048 -0.002048 0.000058687
0.202 -0.002048 -0.002048 0.000058687
0.242 -0.002048 -0.002048 0.000059813
0.283 -0.002048 -0.002048 0.000059062
0.322 -0.002048 -0.002048 0.000059875

We are getting some value from the z-axis but no change in x and y. We are using the Metabase app for taking the data and we did not modify anything. Could you please help me with this problem
Thanks

Comments

  • Hey Illius,

    Can you share mag data from three sensors (one from your defective unit) to see the difference between them.

    Now please note that MMR+ do come with a warning notice that the vibration motor has a magnet that may severely alter the magnetometer data. If you remove the vibrator motor, it will likely resolve your problem.

    This is documented and discussed in another thread in the forum as well.

  • Hello Laura,
    Thanks for your reply. Actually all our six sensors are showing the same behavior. I am attaching simultaneous data from two different boards below.
    And if it is because of the vibration motor then why it is only affecting only x and y-axis data, not the z-axis.
    Lastly, could you please tell me how to remove the vibration motor from MMR+ board.
    Thanks

  • Hi,
    I'm experiencing exactly the same problem with two standard MMR sensors without vibration motor.
    https://mbientlab.com/community/discussion/3348/wrong-magnetometer-measurements#latest

  • Hi,

    I m experiencing the exact same problem:
    magnetometer Z has a vital value, but magnetometers X,Y are completely frozen!

    please help us to solve it. we can't use the MMR device without the 3 axis magnetometer.

    thanks,
    Liran

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