Buzzer Piezo Ceramic Wafer Plate (Without Cover)

The Piezo Vibration Sensor is a versatile component that can both detect vibrations and generate sound, making it a great tool for various projects. Below is an overview of its features, specifications, and an example project using Arduino.

Features:

• Dual Functionality: The Piezo Vibration Sensor can both detect physical vibrations (such as knocks or sound waves) and generate sound when a voltage is applied to it. This dual-purpose functionality opens up a range of applications, from detecting external forces to creating audible alerts.

• Ideal for Beginners: Its simple interface makes it easy for beginners to start experimenting with vibration sensing and sound generation in MCU or Arduino projects.

• Standalone Potential: The sensor can be used independently, which allows for creating projects without needing additional components. This makes it ideal for DIY and hands-on learning.

Specifications:

• Resonant Frequency: 4.6 ± 0.5 kHz

• Resonant Impedance: 300 max

• Voltage Range: DC 3-24V

• Material: Copper

Sample Code for Arduino:

This simple Arduino sketch uses the Piezo Vibration Sensor to detect knocks and toggle an LED based on the sensor input. If the sensor detects a vibration or knock (i.e., the reading exceeds a certain threshold), the LED toggles, and a message is sent to the serial monitor.

// Constants that won't change:
const int LED_PIN = 13; // LED connected to digital pin 13
const int KNOCK_SENSOR = A0; // Piezo connected to analog pin 0
const int THRESHOLD = 100; // Threshold value to determine a knock

// Variables that will change:
int sensorReading = 0; // Variable to store sensor pin reading
int ledState = LOW; // Variable to store last LED status for toggling

void setup() {
  pinMode(LED_PIN, OUTPUT); // Declare LED_PIN as OUTPUT
  Serial.begin(9600); // Initialize serial communication
}

void loop() {
  // Read the sensor and store the value in sensorReading:
  sensorReading = analogRead(KNOCK_SENSOR);

  // If the sensor reading is greater than the threshold:
  if (sensorReading >= THRESHOLD) {
    // Toggle the status of LED_PIN:
    ledState = !ledState; 
    // Update the LED pin itself:
    digitalWrite(LED_PIN, ledState);
    // Send the string "Knock!" back to the computer, followed by newline:
    Serial.println("Knock!");
  }

  delay(100); // Delay to avoid overloading the serial port buffer
}

Wiring Instructions:

1. Connect the positive lead of the piezo sensor to analog pin 0 on the Arduino.

2. Connect the negative lead of the piezo to ground (GND).

3. Attach a 1-megohm resistor between analog pin 0 and ground. This resistor helps the Arduino read the changes in the sensor more effectively.

Applications:

• Knock Detection: Detect knocks or taps in a security system or interactive display.

• Sound Generation: Generate alerts or sounds when certain thresholds are met, such as in alarm systems.

• Vibration Sensing: Use it to detect vibrations in mechanical or structural applications.

• Interactive Projects: Integrate the sensor in games, toys, or exhibits to react to user interactions.