Humans can't detect magnetic fields, but we use devices that rely on magnets all the time. Motors, compasses, rotation sensors, and wind turbines, for example, all require magnets for operation. This ...

Just Download it, compile it (with ArduIno IDE) and use it with HMC5883 Magnetic detector! From the magnetometer definite values are known only. One can direct an axis of the HMC5883 parallel or ...