Unlock the full potential of this Piezo Vibration Sensor as you delve into the realms of vibration sensing and sound generation. Whether you're a novice or an experienced enthusiast, this sensor provides a foundation for a diverse range of exciting projects. Let your creativity flow as you explore the possibilities that the Piezo Vibration Sensor brings to your MCU and Arduino experiments.

Features:

• Dual Functionality: The Piezo Vibration Sensor serves a dual purpose of detecting physical distortions, sound waves, or mechanical strain to produce voltage, and generating sound when a voltage is applied across it. This versatility opens up a myriad of possibilities for creative projects.
• Ideal for Beginners: Designed with beginners in mind, this sensor provides a user-friendly interface for those exploring MCU and Arduino projects. Its simplicity makes it an excellent starting point for hands-on learning.
• Standalone Potential: With the Piezo Vibration Sensor, you can create a multitude of projects without the need for additional components. Its standalone capability allows you to experiment and innovate with ease.

Specifications:

• Resonant Frequency: 4.6 +/- 0.5 kHz
• Resonant Impedance (Ohms): 300 max
• Voltage Range: DC 3-24V
• Material: Copper

Sample Code for Arduino:

This Arduino sketch is designed to leverage a piezo element for detecting knocking sounds. The functionality involves reading an analog pin and comparing the obtained result against a predefined threshold. If the result surpasses this threshold, the sketch sends a "knock" signal to the serial port and toggles the LED connected to pin 13.

Wiring Instructions:

1. Connect the positive lead of the piezo to analog pin 0.
2. Connect the negative lead of the piezo to the ground.

Additionally:

3. Attach a 1-megohm resistor from analog pin 0 to the ground.

This setup enables the Arduino to effectively detect knocks through the piezo element, translating physical impacts into actionable data. The 1-megohm resistor serves as a critical component in the analog pin 0 circuit, contributing to the overall functionality of the knock detection system.

// 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
}