Hi.
Im have magnetometer: mpu9250
Why does the rotate compass in my hands - the angle changes, but when I put it on an object and start to rotate object - the compass stands still?
Sometimes it can "Surprise" and act but most of the time nothing happens ....
I also checked on hmc5883l and it is the same.
I suspect that the item on which I place causes noises ... how can I protect myself against noises? are the modules more or less sensitive?
Avoid placing a magnetometer near magnetic objects, iron containing objects, or wires conducting large currents.
If you want to use the magnetometer as a compass, it must be calibrated. The best procedure is described here: