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I am fusioning data from Acc Gyro and Magn and i have the quaternions and they are looking good and accurate in OpenGL.

What i want is that the user can define max and min rotation for each axis else a vibration maybe will be happen.

Should i convert to Euler and have a degree to check if each of three values is in the bounds? I have already done that but Gimbal lock messes things up. But i want to be as user friendly as possible.

If i cant do that with Euler angles is there an other way to define a max and min quaternion maybe?

Example:

The user defines x:10 y:10 z:10 and if the calibrated values are:

if(x>= calX+x || x<=calX - x) {//and so on....
    //vivbrate
}
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    What do you mean when you say "Gimbal lock messes things up"? Are your axes relative to the body or a global reference frame? – 2017-01-04
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    When i convert quaternions to euler if an axe is 90 degrees i get gimbal and the other two axes show wrong values. I can really answer your question. – 2017-01-04

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