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Just a note. Your Fritizing diagram is missing the ground connection between the PCA9306 and the pro mini.
Actually, that last pin on the PCA9306 shouldn’t be connected to anything. However, you are correct that there should be a common ground between the Pro Mini power source and the HMC5883.
The diagram has now been fixed.
If you've found a bug or have other constructive feedback for our tutorial authors, please send us your feedback!
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