Piezo elements are used to detect vibrations like a knock on a door, table, or other solid surface. A piezo is an electronic device that generates a voltage when it's physically deformed by a vibration, sound wave, or mechanical strain. Similarly, when you put a voltage across a piezo, it vibrates and creates a tone.
You can use these for tap or knock sensors pretty easily by reading the voltage on the output. They can also be used for a very small audio transducer such as a buzzer.
Two 30 cm long wires are already soldered to the element.
Plate Material: Brass
Resonant Frequency: 4.6 ± 0.5kHz
Resonant Impedence: 300 ohm max
Capacitance: 20.0 ± 30% nF [1kHz]
Plate Diameter: 27mm
Element Diameter: 19.7mm
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