A piezoelectric disc generates voltage when bent or struck and can act as an actuator when driven by an alternating voltage. Its pulse may reach a high voltage even though available energy is small.
Input protection
Do not connect an uncontrolled piezo directly to an ADC input. Use a series resistor, discharge resistor, and clamp diodes or another protection network so the pin remains inside the controller limits.
Reading
Sample fast enough to capture the pulse, record a peak or windowed energy value, and apply a threshold calibrated for the mechanical mounting.
Use
It suits knock, vibration, and impact detection. Quantitative measurements need controlled mounting, calibration, and often a charge amplifier.
Engineering review: verify the library version, module operating voltage, and the actual board pinout before wiring; visually similar breakout boards can differ.
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