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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 http://hobbylogs.me.pn/?p=17#more-17. 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 http://hobbylogs.me.pn/?p=17#more-17

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