Involvement:Expert (understands the inner workings) - Ownership:1 week to 1 month
Very small form factor. I2C interface so it doe not consume too many IO pins. The HMC5883 magnetometer is a pretty standard part in the microcontroller/robotic community. Libraries exist for arduino and netduino
math is required to use this magnetometer as a compass. Calculating headings requires some complex higher order math functions...
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