Piezo sensor in project

Projects
1

I want to know if I can use piezoelectric element for a project using bolt module

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Yes u can use this Sensor as an Analog Input device

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Yes you could use piezoelectric device as analog input device.Even you can use for detecting the tones like "knock knock " of certain intensity and do remember that piezoelectric device have polarity.

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Yes, You can use it as a Alerting device((buzzer) for your project like an alarming system.