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Arduino compass (HMC5883L) with OLED screen – Cassiopeia Ltd
DAOKI 3V-5V GY-273 QMC5883L Triple Axis Compass Magnetometer Sensor Module Three Axis Magnetic Field Module Materiale with Male and Female Dupont Cables for Arduino,Pack of 3: Amazon.com: Industrial & Scientific
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function - Converting Arduino compass signal to useable heading - Stack Overflow
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How to fix HMC5883L sensor that doesn't work - miliohm.com