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Make: Sensors by Ville Valtokari, Kimmo Karvinen, Tero Karvinen

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Chapter 10. Electricity and Magnetism

Hall sensors detect a magnetic field. They come in different varieties: some just detect the presence of a magnet, while others can tell you the strength of the magnetic field in teslas.

Voltage and current sensors work like a multimeter, measuring electricity passing through them. They can easily measure power that would otherwise break a microcontroller’s analog input pin.

An electronic compass can tell you where magnetic north is. Better ones combine an accelerometer, so that ...

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