Project37.High Sensitivity Sound Detection Module

Description

The KY-037 high sensitivity sound detection module is an analog/digital sensor that uses a condenser microphone to observe changes in environment noise. Generally used to detect sound above certain levels. It has a potentiometer to set the noise detection threshold.

The digital output provides a HIGH signal when sound above the threshold is detected. The analog output shows values representing the noise levels detected by the condenser microphone, the values are relative to the provided voltage and potentiometer position, making it difficult to reconstruct the audio from the obtained values.

This module is compatible with popular microcontroller platforms like Arduino, ESP32, ESP8266, and Raspberry Pi.

Specification

  • Operating voltage 3.3V ~ 5.5V

  • Microphone sensitivity -42 ±3 db

  • Current consumption ~0.5mA

  • Board Dimensions 15mm x 36mm

Connect

_images/37_bb.png

Code

int digitalPin = 7;   // KY-037 digital interface
int analogPin = A0;   // KY-037 analog interface
int ledPin = 13;      // Arduino LED pin
int digitalVal;       // digital readings
int analogVal;        // analog readings

void setup()
{
pinMode(digitalPin,INPUT);
pinMode(analogPin, INPUT);
pinMode(ledPin,OUTPUT);
Serial.begin(9600);
}

void loop()
{
// Read the digital inteface
digitalVal = digitalRead(digitalPin);

if(digitalVal == HIGH)
{
    digitalWrite(ledPin, HIGH); // Turn ON Arduino's LED
}
else
{
    digitalWrite(ledPin, LOW);  // Turn OFF Arduino's LED
}

// Read analog interface
analogVal = analogRead(analogPin);
// Print analog value to serial
Serial.println(analogVal);
}

Calibrate the module’s detection threshold using the potentiometer. Turn it clockwise to increase detection sensitivity, or turn it counter-clockwise to decrease detection sensitivity.

If the module’s L2 LED is on, the noise levels are above the threshold and you should decrease the sensitivity. If the L2 LED is off, the noise level is below the threshold and you should increase the sensitivity. Turn the potentiometer to find the exact point where the LED changes its state.

Phenomenon

_images/37.jpg