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
--------
.. image:: /img/connect/37_bb.png

Code
-----
.. code-block:: c

    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
-----------

.. image:: /img/phenomenon/37.jpg