![]() ![]() In contrast, a piezo buzzer is driven by voltage rather than current and is constructed out of piezoelectric material. A magnetic buzzer operates similarly to a traditional speaker: a current driven through a coil of wire produces a magnetic field, which dynamically moves a magnetic disk resulting in a sound wave. There are two primary types of buzzers: magnetic and piezo. If you want to learn more about interrupts on the Arduino, see Nick Gammon’s blog post and this Adafruit Learn series. If you want to take a (super) deep dive into how tone works, see the source code here and accompanying notes.
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