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The magnetic field from the magnets won't affect the coils, but because the magnets are coated with metal, there will be some current generated in the metal plating, therefore using a little more energy from the charging coil.
Clever circuit. I also like the use of the bottle cap as a control knob.
The code that says "import" is the Python code. You run that on your PC using Python. The Arduino code is "sketch_SerialTest.ino"
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