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The scientists Christoph Holz, Alexander Pusch, Thomas Wilhelm and Jochen Kuhn have published an article in the journal “Physics in our time” about the possibility of measuring current with a cell phone.
Her work is about the magnetic field sensor in the smartphone, which, in combination with a suitable app, enables electrical currents to be measured. A coil clip from the 3D printer increases practicality and accuracy.
The magnetic field sensor in the smartphone is usually designed in three axes and is sensitive enough to determine the earth’s magnetic field with sufficient accuracy for navigation purposes. As the researchers explain in their work, the magnetic field sensor can measure not only the magnetic flux density but also direct current strengths. To make this possible, you can, for example, wind a coil and place it over the magnetic field sensor. The current strength in the coil is inferred from the measured magnetic field.
To increase the practicability and reproducibility in the experiment, a simple holder from the 3D printer can be used. The coil and the cable are thus fixed to the smartphone. The current can be measured with an associated app.
The complete work can be done here for free to be viewed as. Models and software can be found on the developers’ website download.
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