BLUE DOT ELECTRONICS

Have you ever imagined controlling an LED with just a clap? In this simple Arduino project, we will build a Clap Switch using an Arduino Uno, a sound sensor module, and LEDs.

When the sound sensor detects a clap, the Arduino processes the signal and turns the LED ON. This project is perfect for beginners who want to learn how sensors interact with Arduino.

Components Required

Sr. No.	Component	Quantity
1	Arduino Uno / Nano ➤ https://amzn.to/4dBgpHp	1
2	Sound Sensor Module ➤ https://amzn.to/3QBjvlI	1
3	LED ➤ https://amzn.to/4tYOLc4	2
4	220Ω Resistor ➤ https://amzn.to/4u3aCiH	2
6	Jumper Wires➤ https://amzn.to/430CfOo	3 (M-F)
7	USB Cable	1

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Circuit Connections

LED Connections

LED 1

• Arduino Pin 8 → 220Ω Resistor → LED Positive Leg
• LED Negative Leg → GND

LED 2

• Arduino Pin 9 → 220Ω Resistor → LED Positive Leg
• LED Negative Leg → GND

Sound Sensor Connections

• VCC → 5V
• GND → GND
• DO → Arduino Pin 2

Double-check all connections before powering the circuit.

Arduino Code

Upload the following code to your Arduino board:

const int sensorPin = 2;
const int ledPin1 = 8;
const int ledPin2 = 9;

bool ledState = false;

void setup() {
  pinMode(sensorPin, INPUT);
  pinMode(ledPin1, OUTPUT);
  pinMode(ledPin2, OUTPUT);
}

void loop() {

  if (digitalRead(sensorPin) == LOW) {

    ledState = !ledState;

    digitalWrite(ledPin1, ledState);
    digitalWrite(ledPin2, ledState);

    delay(300);
  }
}

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Applications of Clap Switch

• Smart home projects
• Sound-controlled lights
• Arduino learning projects
• DIY automation experiments
• Beginner electronics practice

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