Piezo Element
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.
Documents:
- Datasheet (7BB-20-6L0)
- Arduino Tutorial
(SparkFun product SEN-10293)
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