Sound Sensor

Detects sound levels and audio signals for interactive projects

Overview

Sound sensors detect audio signals and sound levels in the environment. They're perfect for clapping-activated systems, voice-controlled projects, and sound-reactive lighting. These sensors can provide both analog output (sound intensity) and digital output (sound detection) making them versatile for various audio-based automation projects.

Technical Specifications

Operating Voltage: 3.3V - 5V DC
Operating Current: 4-5mA
Frequency Range: 50Hz - 20KHz
Sensitivity: Adjustable (via potentiometer)
Output: Analog (sound level) & Digital (threshold)
Detection Range: Depends on sound intensity and environment
Response Time: < 1 ms
Operating Temperature: −40 °C to +85 °C

Key Features

  • Dual output: analog and digital signals
  • Adjustable sensitivity via onboard potentiometer
  • Wide frequency response range
  • Fast response time for real-time applications
  • LED indicator for sound detection status
  • Easy integration with microcontrollers
  • Low power consumption
  • Compact size for easy mounting

Wiring Diagram

Basic Connection (Arduino Uno)

Sound Sensor Pin → Arduino Pin
VCC → 5V (or 3.3V)
GND → GND
AO (Analog) → Analog Pin A0
DO (Digital) → Digital Pin 2

Note: Adjust the onboard potentiometer to set the desired sensitivity level.

Common Applications

Clap-Activated Systems

Control lights and appliances with hand claps

Sound-Reactive Lighting

LED strips that respond to music and sound

Security Systems

Audio-based intrusion detection and monitoring

Voice Control

Simple voice-activated switches and commands

Quick Info

Difficulty: Beginner
Price Range: ₹150-300
Interface: Analog/Digital

Compatible Boards

Sample Code

#define SOUND_DIGITAL 2
#define SOUND_ANALOG A0
#define LED_PIN 13

void setup() {
  Serial.begin(9600);
  pinMode(SOUND_DIGITAL, INPUT);
  pinMode(LED_PIN, OUTPUT);
  
  Serial.println("Sound Sensor Test");
}

void loop() {
  int digitalValue = digitalRead(SOUND_DIGITAL);
  int analogValue = analogRead(SOUND_ANALOG);
  
  if (digitalValue == HIGH) {
    digitalWrite(LED_PIN, HIGH);
    Serial.println("Sound Detected!");
  } else {
    digitalWrite(LED_PIN, LOW);
  }
  
  Serial.print("Analog Value: ");
  Serial.println(analogValue);
  
  delay(100);
}