SparkFun Forums

[Bermerlin]

Here are two software tools for convenient calibration of magnetometers (even applies to accelerometers using gravitational instead of magnetic field):

MagCal
http://sailboatinstruments.blogspot.com ... ation.html

Magneto
http://sailboatinstruments.blogspot.com ... -part.html

[hpux735]

Hi all,

It would be fine if one can place the sensors exactly at the intersection of the 3 rotational axes. But that's practically near-impossible, which means the accelerometers will pickup accelerations other than gravity when the platform rotates.

Does this then mean that gyros are an absolute must to get orientation information?

Gyros may be mounted away from the axis of rotation. As you mentioned, accelerometers less so. Also, magnetometers may be mounted away from the axis of rotation. Therefore, you should be OK if you mount the accelerometer in the center and the other sensors where its convenient.

[naseer20]

Hi,
Can we Calculate Direction in which the object is travelling downwards using triaxial Accelerometer and Magnetometer?

Thanks,
Naseer

[tarango]

Hi,
How can I measure my child's exact location in a mall when he is out from me? Can anyone guide me to do make a device by using IMU(Inertial measurement unit) or by other things like as Magnetometer or combined all of the things.