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Piezo elements come in handy when you need to detect vibration or a knock
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
Provides an audio output, but also a binary indication of the presence of sound, and an analog representation of its amplitude
The 3 outputs are simultaneous and independent, so you can use as many or as few as you want at once