17. Sound Sensor

Sound sensors are versatile components that can detect and respond to sound levels in their environment. They are widely used in applications such as sound-activated lights, security systems, and voice-activated devices.

Materials

Component	Image
Breadboard
Jumper wires
Arduino Uno R4 Minima
Sound Sensor

Instructions

1. Make the following connections using the breadboard and jumper wires.

Connections

(Sound Sensor to Arduino)

• DO to pin 3
• + to 5V
• G to GND
• A0 to A0

2. Paste the following code into your main Arduino sketch:

Code

int  sensorAnalogPin = A0;    // Select the Arduino input pin to accept the Sound Sensor's analog output 
int  sensorDigitalPin = 3;    // Select the Arduino input pin to accept the Sound Sensor's digital output
int  analogValue = 0;         // Define variable to store the analog value coming from the Sound Sensor
int  digitalValue;            // Define variable to store the digital value coming from the Sound Sensor
int  Led13 = 13;              // Define LED port; this is the LED built in to the Arduino (labled L)
                        

void setup()
{
  Serial.begin(9600);               // The IDE settings for Serial Monitor/Plotter (preferred) must match this speed
  pinMode(sensorDigitalPin,INPUT);  // Define pin 3 as an input port, to accept digital input
  pinMode(Led13,OUTPUT);            // Define LED13 as an output port, to indicate digital trigger reached
}

void loop(){
  analogValue = analogRead(sensorAnalogPin); // Read the value of the analog interface A0 assigned to digitalValue 
  digitalValue=digitalRead(sensorDigitalPin); // Read the value of the digital interface 3 assigned to digitalValue 
  Serial.println(analogValue); // Send the analog value to the serial transmit interface
  
  if(digitalValue==HIGH)      // Depending on the sensitivity, you can compare the analog value with the threshold
  {                           // (adjust the potentiometer clockwise to increase sensitivity, and counter-clockwise
                              // to decrease sensitivity
    digitalWrite(Led13,HIGH);
  }
  else
  {
    digitalWrite(Led13,LOW);
  }
  
  delay(50);                  // Slight pause so that we don't overwhelm the serial interface
}

3. Connect your Arduino to your laptop using a USB-C cable and upload the code to the arduino.

4. Test! Make noises near your sound sensor and watch the LED turn on and off. You can also open the serial monitor to see analog values fluctuate.

5. Optionally, you can increase sensitivity of the sound sensor by rotating the potentiometer clockwise. You can also decrease sensitivity by rotating the potentiometer counter-clockwise. Additinally, you can adjust the code to only turn on the LED at different thresholds. Look at the comments in the code to see where to make edits.

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