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Scientists Christoph Holz, Alexander Pusch, Thomas Wilhelm and Jochen Kuhn have published an article in the journal “Physics in our time” on the possibility of measuring current with a cell phone.
His work is on the magnetic field sensor in the smartphone, which, in combination with a suitable application, allows to measure electrical currents. A 3D printer coil clip increases practicality and precision.
The magnetic field sensor in the smartphone is generally designed in three axes and is sensitive enough to determine the earth’s magnetic field with enough precision for navigation purposes. As the researchers explain in their work, the magnetic field sensor can measure not only the density of the magnetic flux but also direct current intensities. To make this possible, you can, for example, wind a coil and place it on the magnetic field sensor. The current intensity in the coil is inferred from the measured magnetic field.
To increase practicality and reproducibility in the experiment, a simple 3D printer stand can be used. The coil and cable are fixed to the smartphone. The current can be measured with an associated application.
The complete work can be viewed here for free. Models and software can be downloaded from the developers website.
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