It's a compass when it's held level. It's repeatable to within 1 degree when you hold it level and don't move, in any direction. But it can be off by 90 degrees in an absolute sense. Not accurate at all for finding North. Any ideas? Mistakes in code? It's mounted upside down in my application so I …

HMC5883L compass huge error [SOLVED]

nickgammon April 10, 2012, 4:42am 5

Change the gain maybe? See the examples in the datasheet.

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