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I2C Compass (CMP2X)
Features
I2C Compass

CMP2X is a digital magnetic compass, which can be used in I2C mode to detect deviation from magnetic north pole (heading). It appears as 24xx series EPROM, with a different I2C address. This compass uses orthogonal two-axis magnetic sensor from Honeywell (HMC1052).

* Multiple reading modes (Byte/Int/Float)
* Dual sampling frequency (European/North American)
* Intuitive command interface

How to Calibrate I2C Compass

CMP2X is capable of calibrating in-situ and can supply high resolution heading information. To calibrate CMP2X, issue Calibration command and turn around at least twice while taking 20 second or more per turn. Issuing calibration Done command ends the calibration mode and resumes normal operation.
All the calibration constants are stored in internal nonvolatile memory. and they are retained even while the power is off.
User Guide

Download User Guide here