HMC5883L Magnetometer chip Possibilities.

[andybarrett1]

Hi Richard

Had put this on the back burner for a whilst....

Will revisit it later... I see you have done a few things differently!

Thank you for Ideas. Andy

[towlerg]

Hi Richard,

you need to add a 3-axis accelerometer to do tilt compensation, something like LSM303DLM.

George

[richard]

turns out that the premise of using this chip alone as a compass is basically flawed. it can't do its own tilt compensation because the earths magnetic field is not necessarily parallel to the earth .
as George says an accelerometer needs to be added to compensate for tilt. (read, complicated math probably needs floats for any decent accuracy)

no wonder they are so cheap , not a total loss it makes a pretty sensitive 3 axis hall effect sensor , nice colour

[towlerg]

Richard,

Not if your application will not be required to tilt or has some mechanical (gimbals) way to negate the problem.

George

[andybarrett1]

Hi both

Yeah.... I put your code in Richard ... Does pretty much same as before... So I think I need find a better chip
Or use a real needle

Thank you again for ideas .... Appreciated !