An Arduino-based system with a triple axis magnetometer chip may be used to plot both the strength and direction of the magnetic field of a magnet directly on a sheet of paper. Before taking measurements, it is necessary either to correct for or to eliminate soft and hard iron effects. The same sensor may be used to determine the presence of soft iron effects.
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Mike McCaughey; An Arduino-Based Magnetometer. Phys. Teach. 1 May 2017; 55 (5): 274–275. https://doi.org/10.1119/1.4981032
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