Sound Sensor (KY-038) with Arduino and LED

In this tutorial, we will guide you to use a sound sensor with an Arduino and LED. By the end of this tutorial, you'll be able to set up your Arduino to control an LED with a sound sensor module.

Materials Needed:

1. Arduino board (e.g., Arduino Uno)
2. LED
3. Resistor (220-ohm)
4. Breadboard
5. Jumper wires (Both male-to-male and male-to-female)
6. Sound Sensor Module

Sound Sensor Module:

The Arduino sound sensor KY-038 module is a portable device designed to detect sound signals in its surroundings. It has a receiver to receive analog sound input and a potentiometer to control the threshold of the sensor.

There are 4 pins on the digital sound sensor. They are :

1. AO - Analog pin
2. G - Ground pin
3. + - Positive power pin
4. DO - digital output pin

Step 1: Building the circuit

1. Connect the LED to the middle of the breadboard.
2. Connect the 220-ohm resistor in series with the LED, connecting the other end of the resistor to digital pin 8.
3. Connect the shorter leg of the LED to the ground (GND) pin on the Arduino.
4. Connect the "+" pin to the 5V pin on the Arduino.
5. Connect the "G" ground pin to the GND pin on the Arduino.
6. Connect the "DO" digital output pin to any analog or digital pins on the Arduino. In this tutorial, I connected it with A0.

Step 2: Coding

1//initialize pin numbers for sound and led
2const int ledPin=8;
3const int soundPin=A0;
4//initialize soundValue and the threshold for sound
5int soundSensValue=0;
6int threshold=550;
7
8void setup() {
9  // put your setup code here, to run once:
10  //initialize LED pin as an output and soundPin as an input
11  pinMode(ledPin,OUTPUT);
12  pinMode(soundPin,INPUT);
13  Serial.begin(9600);
14}      
15void loop() {
16  //read the value from sound sensor
17  soundSensValue=analogRead(soundPin);
18  Serial.print("Sound sensor value: ");
19  Serial.println(soundSensValue);
20
21  //check if the soundValue is less than or equal to the thresshold, if so turn on the LED
22  if (soundSensValue>=threshold) {
23    digitalWrite(ledPin,HIGH);
24    delay(1000);
25  }
26  //else turn of the LED
27  else {
28    digitalWrite(ledPin,LOW);
29  }
30}

Note: Please adjust your sensor potentiometer as described in the video linked below before uploading your code.

Step 3: Upload the Code to Arduino and clap your hands

1. Connect your Arduino board to your computer using a USB cable and upload the code.
2. Once the code is uploaded successfully, you will see the LED turning on whenever you clap your hands.

Link to the code: