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My previous post was devoted to the illustration of a digital magnetoresistive sensor. A digital sensor provides just two states: on and off. Such sensors, then, can only tell you if there is a strong enough magnetic field close to the sensor or not.   In this post I'm going to illustrate the usage of a digital compass, namely a device from Digilent called PmodCMPS, to measure the intensity of a magnetic field. The device uses the HMC5883L digital compass IC from Honeywell to measure the t ...