Isn't this creating an ac output, both positive and negative? wouldn't the negative swings be bad/damaging to the arduino?

Checking it with an oscilloscope, the negative swing seems to be clamped, probably by the diode and resistor circuit on the board, although I haven't traced the circuit out to be sure.

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HiLetgo 5pcs Piezoelectric Sensor Analog Ceramic Vibration Sensor Module Piezoelectricity for Arduino DIY KIT

Product ID: 119367794

Details

Connector Type
Screw
Number Of Contacts
1
Mounting Type
PCB Mount
Material
Ceramic
Brand
HiLetgo
Voltage
5 Volts

⚡Piezoelectric tech

📏Compact size

🔌3.3V/5V power

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2462 som

Duties & taxes included

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Sold byAmazon KyrgyzstanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Details

Connector Type
Screw
Number Of Contacts
1
Mounting Type
PCB Mount

Description

🎶 Turn Vibes into Innovation!

COMPACT DESIGN - Small footprint (30mm x 23mm) fits seamlessly into your projects.
VERSATILE COMPATIBILITY - Easily integrates with Arduino for endless DIY possibilities.
PERFECT FOR CREATIVE PROJECTS - Ideal for building electronic drums and other interactive devices.
REAL TIME VIBRATION DETECTION - Detects even the slightest vibrations for precise interactions.
TRANSFORM VIBRATION INTO ACTION - Harness the power of piezoelectricity for innovative projects.

The HiLetgo 5pcs Piezoelectric Sensor Module is a cutting-edge DIY kit designed for Arduino enthusiasts. Utilizing advanced piezoelectric ceramic technology, it detects vibrations and converts them into electrical signals, making it perfect for interactive projects like electronic drums. With a working voltage of 3.3V or 5V and a compact size of 30mm x 23mm, this module is both versatile and easy to integrate into your creative designs.

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