electronic compass

[Joe2003]

Does anyone know how sensitive these are to motors/servos noise:-

http://www.active-robots.com/products/sensors/sensors-details-6.shtml

thanks

[Tom Harper]

Joe,

That's a pretty general question.

A quick estimate is that the unit can respond to less than a .1 gauss change in the magnetic field. That is tiny compared to the stray field around an electric motor - which of course depends on the motor.

Looks like a nice peice of equipment. I'd mount it out on the wing or on top of the rudder.

[Joe2003]

Yeah, was gonna mount it on the rudder. Thought it was worth asking though.

thanks for the reply tom

[MattChave]

Accuracy: 3-4 degrees
you can do much better than that, have a look around the honewell site for a reference design.

remember you can calibrate the stray fields around magnetic devices as a dc offset, and you can filter to get rid of ac fields if your only interested in low freq. so its not really a problem.