Piezo Detect Vibration 20mm

Piezo Vibration Sensor – 20 mm Disc Element

Overview:

A compact, versatile 20 mm piezoelectric disc sensor that generates voltage when subjected to mechanical vibration, impact, or sound. Commonly used in DIY projects for detecting knocks, taps, vibrations, or even simple sound detection with microcontrollers like Arduino, ESP32, or Raspberry Pi.

Key Features:

• Element Size: 20 mm diameter ceramic disc

• Generates voltage on mechanical stress (vibration/impact)

• No power supply needed—works in passive mode

• Easy to interface with analog/digital inputs

• Ideal for knock sensors, vibration alarms, and sound sensing

Technical Specifications:

Working Principle:

Upon mechanical stress (e.g., tap, vibration), the piezo disc produces brief voltage pulses. Use a 1 MΩ resistor in parallel to stabilize the signal and optionally a diode & capacitor for peak detection forum.arduino.cc+7courses.grainger.illinois.edu+7ardumotive.com+7.

Wiring Example – Arduino Uno:

Optionally, add a diode + 50 nF cap across the piezo for peak hold theorycircuit.com+3electropeak.com+3wiki.keyestudio.com+3courses.grainger.illinois.edu.

Applications:

• Knock/tap detection (e.g., knock-to-open doors)

• Vibration sensing for machines, vehicles, or structures

• Sound-triggered projects (clap detection)

• Impact detection and alarms

• DIY percussion instruments

Resources:

• 📘 Arduino Official “Detect a Knock” Example:
  Showcases code exactly using a piezo disc on A0 faranux.com+9docs.arduino.cc+9forum.arduino.cc+9

✅ Quick Arduino Code Sketch:

cpp
CopyEdit
const int piezoPin = A0;
void setup() {
  Serial.begin(9600);
}
void loop() {
  int val = analogRead(piezoPin);
  Serial.println(val);
  delay(100);
}