I'm not sure who the author of this code is. Let me know and I will include attribution. The Duinotech 3-Axis Compass Magnetometer Module (Part Number: XC-4496) can be purchased from Jaycar ...

Wire.h - No need to included it at the top of your sketch. QMC5883L Compass will included it for you. Just ensure that it is installed in your IDE. QMC5883L Compass Library calculates the direction ...