Detect north with HMC5883L without accelerometer

Other Hardware Sensors
1

Hi, I would like to know how to correct the tilt only to align X and Y.

I'm trying to use the HMC5883L just to detect the heading considering only rotations about Z axis. I'm not using accelerometer.

What can I do?

Thanks.

2

The early electronic compasses all used 2D magnetometers, and the user was required to keep one level while taking a reading. In your case, just take the X and Y readings and compute the magnetic north vector. A bubble level would help to keep the X-Y plane level.

Of course you would want to make sure that the magnetometer is properly calibrated. Here is a link to my favorite procedure: Sailboat Instruments: Improved magnetometer calibration (Part 1)

I wrote a similar program for 2D magnetometers, but you have to have access to MATLAB to use it: HMC6352 2D magnetometer revisited - SparkFun Electronics