Piezo Element – 4.2kHz
A Piezo element comes in handy when you need to detect vibration or a knock. This sensor measures 27mm in diameter and just 0.45mm thick. You can use these for tap or knock sensors pretty easily by reading the voltage on the output. An Arduino or compatible microcontroller with an analog input should be able to detect the voltage change with relative ease. They can also be used for a very small audio transducer such as a buzzer.
- Resonant Frequency: 4.2kHz
- Element Diameter: 18mm
- Overal Diameter: 27mm
- Capacitance: 25,000 pF ± 30% at 100Hz
- Resonant Impedance: 500 Ohms max
- Thickness: 0.25mm
- Plate Material: Brass
- Input Voltage: 30Vp-p Max
Arduino Knock Sensor: https://www.arduino.cc/en/Tutorial/Knock
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This product has a 30 Day Warranty from the date of delivery. The item must not be modified, abused, incorrectly hooked up, or used for purposes outside the original scope of design.
This product is returnable Within 14 Days of delivery. Item must be unopened, unused, and in re-saleable condition.