![Piezo Sensor Element 35mm](http://store.fut-electronics.com/cdn/shop/products/PiezoElement_99a24377-feaa-469d-9c06-b4e59f48f47b_1024x1024.jpg?v=1654607548)
![Piezo Sensor Element 35mm](http://store.fut-electronics.com/cdn/shop/products/PiezoElement_99a24377-feaa-469d-9c06-b4e59f48f47b_medium.jpg?v=1654607548)
![Piezo Sensor Element 35mm](http://store.fut-electronics.com/cdn/shop/products/piezo_element_large_d7d9a7b4-92e8-4443-ab7e-e7e0c2e2d226_medium.jpg?v=1654607548)
Piezo element is a sensor which is used to detect vibration, in this case, a knock on a door, table, or other solid surface.
A piezo is an electronic device (sensor) 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. Piezos can be used both to play tones and to detect tones.
For more information on piezo-electric elements, please click here
For how to use peizo sensor with Arduino, please click here