Instabilities with yaw/pitch/roll values while device is stable about madgwickahrs HOT 11 CLOSED

I am working on this now.
I get a problem that the data of any axis being perpendicular to the ground keep rotating. Have ever encountered this problem?

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Hi, @lixuwork. Sounds very similar to my issue.

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Gimbal Lock?

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Hi @PaulStoffregen, I appreciate the help.

I just re-read over gimbal lock to make sure I'm familiar with the general concepts. Would this problem continue to persist over different trials and tests?

I've plotted out the raw data from each of the sensors and they all seem to be working as expected in terms of scale and orientation. Rotating/accelerating about each axis produces expected results from the sensor data.

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Sadly, I can't look at this right now. Crazy busy with another urgent (and very late) project.

But at first glance, it sounds like gimbal lock, so maybe just a pointer to that well-known limitation of roll-pitch-yaw will help? That's all I can do at this moment.

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@PaulStoffregen I appreciate the time you've spent! I'll dive in a bit more. Thanks!

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gyro has error ? Is it calibrated? @ @tshaddix

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Hi, @PaulStoffregen @tshaddix , I just meet the same problem. I use this filter to get the stable quaternion, but the result shows q0 keeps up and q1, q2, and q3 keeps down no matter what value the parameter "delta" is . When I convert the quaternion to euler angles(Raw, pitch, yaw), they keep up just like your data. Do you solve this problem?

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Hi @marooncn . I ended up just going with an IMU that does all of the sensor fusion for you after I had so much trouble getting things to work out myself. Sorry - wish I could be more helpful!

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@tshaddix
Have you solved your problem yet? I think these code is wrong

mx = imu.calcMag(imu.my);
my = -imu.calcMag(imu.mx);
mz = imu.calcMag(imu.mz);

below is correction

mx = -imu.calcMag(imu.mx);
my = -imu.calcMag(imu.my);
mz = imu.calcMag(imu.mz);

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Hi @HelenXR , thanks for following up on this. I never did get this working. Did you try this code on the same IMU type? I remember I had swapped those axises because of a mismatched coordinate system with the IMU (mentioned in the "Potential Problem Areas" section of this issue).

If that is the solution for this IMU, then that's wonderful :)

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