HMC5883L on Arduino with auto calibration capability
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Core Versions Arrangments Jun 30, 2014 update May 13, 2014
Read Me (Compass header file description).pdf Addition of Core files and Read Me May 13, 2014

HMC5883L Header Arduino With Auto calibration

HMC5883L on Arduino with auto calibration capability

This article is copied from my memo which I wrote for myself to keep track of my casual stuff. This memom is publicly available on It is assumed that the reader knows how to connect the pins of HMC5883L breakout board to Arduino, which is very simple.

HMC5883L Arduino

VCC -> 5V or 3.3V (HMC5883L is rated for 3.3v but the break out board have a small voltage regulator) GND -> GND SDA -> SDA SCL -> SCL

I wrote a header file for HMC5883L, and the target is to use it as a compass in 2D plane (i.e x and y axis) which is horizontal to the ground. Moreover, the compass points to the magnetic north and NOT the true north as I only require a fixed reference in 2D plane. I hope it will be helpful. If you find any bug please leave a comment. I will look into it as soon as possible.

For detail about the functions please read "Read Me (Compass header file description).pdf" or