Microphone doesn't work properly

Other Hardware Sensors
1

Hello, I've bought a microphone sensor for my arduino(Mega 2560)
the specific kind of microphone is KY-037. You can see more details about this sensor at this Link

so I connected all the wires according to this site and I've copied the code from the site and uploaded it to my arduino but the microphone sensor seems unresponsive to sound or at least shows very low change in the analog output relative to the sound intensity.
So I found on this website that the trimming potentiometer is responsible for the microphone's sensitivity and I did tried to adjust it to both sides but it didn't helped, I could only see that the background sound from the analog output is increasing/decreasing but the microphone still didn't respond much to sound.
And also, no matter what I did, the digital output always was on High mode.

This is the code I used:

const int analogP = A0;
const int digitalP = 8;

void setup() {

  pinMode(analogP, INPUT);
  pinMode(digitalP, INPUT);

  Serial.begin(9600);

}

void loop() {

  float analog;
  int digital;

  analog = analogRead(analogP);
  digital = digitalRead(digitalP);

  Serial.println("Analog voltage value: "); Serial.print (analog, 4);  Serial.print ("V, ");
  Serial.print ("Extreme value: ");

  if (digital == 1)
  {
    Serial.println (" reached");
  }
  else
  {
    Serial.println (" not reached yet");
  }

  Serial.println ("----------------------------------------------------------------");
  delay (200);

}

And this is the Serial Monitor Log, at the time I was recording I've made some noise but as you can see there is no obvious change in the analog/digital outputs.

Analog voltage value: 
74.0000V, Extreme value:  reached
----------------------------------------------------------------
Analog voltage value: 
74.0000V, Extreme value:  reached
----------------------------------------------------------------
Analog voltage value: 
74.0000V, Extreme value:  reached
----------------------------------------------------------------
Analog voltage value: 
75.0000V, Extreme value:  reached
----------------------------------------------------------------
Analog voltage value: 
72.0000V, Extreme value:  reached
----------------------------------------------------------------
Analog voltage value: 
75.0000V, Extreme value:  reached
----------------------------------------------------------------
Analog voltage value: 
75.0000V, Extreme value:  reached
----------------------------------------------------------------
Analog voltage value: 
71.0000V, Extreme value:  reached
----------------------------------------------------------------
Analog voltage value: 
76.0000V, Extreme value:  reached
----------------------------------------------------------------
Analog voltage value: 
78.0000V, Extreme value:  reached
----------------------------------------------------------------
Analog voltage value: 
83.0000V, Extreme value:  reached
----------------------------------------------------------------
Analog voltage value: 
76.0000V, Extreme value:  reached
----------------------------------------------------------------
Analog voltage value: 
77.0000V, Extreme value:  reached
----------------------------------------------------------------
Analog voltage value: 
75.0000V, Extreme value:  reached
----------------------------------------------------------------
Analog voltage value: 
79.0000V, Extreme value:  reached
----------------------------------------------------------------
Analog voltage value: 
76.0000V, Extreme value:  reached
----------------------------------------------------------------
Analog voltage value: 
76.0000V, Extreme value:  reached
----------------------------------------------------------------
Analog voltage value: 
77.0000V, Extreme value:  reached
----------------------------------------------------------------
Analog voltage value: 
77.0000V, Extreme value:  reached
----------------------------------------------------------------
Analog voltage value: 
74.0000V, Extreme value:  reached
----------------------------------------------------------------
Analog voltage value: 
67.0000V, Extreme value:  reached
----------------------------------------------------------------
Analog voltage value: 
76.0000V, Extreme value:  reached
----------------------------------------------------------------
Analog voltage value: 
74.0000V, Extreme value:  reached
----------------------------------------------------------------
Analog voltage value: 
75.0000V, Extreme value:  reached
----------------------------------------------------------------
Analog voltage value: 
74.0000V, Extreme value:  reached
----------------------------------------------------------------
Analog voltage value: 
71.0000V, Extreme value:  reached
----------------------------------------------------------------
Analog voltage value: 
82.0000V, Extreme value:  reached
----------------------------------------------------------------
Analog voltage value: 
75.0000V, Extreme value:  reached
----------------------------------------------------------------
Analog voltage value: 
75.0000V, Extreme value:  reached
----------------------------------------------------------------
Analog voltage value: 
76.0000V, Extreme value:  reached
----------------------------------------------------------------
Analog voltage value: 
78.0000V, Extreme value:  reached
----------------------------------------------------------------
Analog voltage value: 
76.0000V, Extreme value:  reached
----------------------------------------------------------------
Analog voltage value: 
97.0000V, Extreme value:  reached
----------------------------------------------------------------
Analog voltage value: 
76.0000V, Extreme value:  reached
----------------------------------------------------------------
Analog voltage value: 
78.0000V, Extreme value:  reached
----------------------------------------------------------------
Analog voltage value: 
76.0000V, Extreme value:  reached
----------------------------------------------------------------
Analog voltage value: 
74.0000V, Extreme value:  reached
----------------------------------------------------------------
Analog voltage value: 
80.0000V, Extreme value:  reached
----------------------------------------------------------------
Analog voltage value: 
75.0000V, Extreme value:  reached
----------------------------------------------------------------
Analog voltage value: 
75.0000V, Extreme value:  reached
----------------------------------------------------------------
Analog voltage value: 
74.0000V, Extreme value:  reached
----------------------------------------------------------------
Analog voltage value: 
74.0000V, Extreme value:  reached
----------------------------------------------------------------
Analog voltage value: 
75.0000V, Extreme value:  reached
----------------------------------------------------------------
Analog voltage value: 
75.0000V, Extreme value:  reached
----------------------------------------------------------------
Analog voltage value: 
74.0000V, Extreme value:  reached
----------------------------------------------------------------
Analog voltage value: 
74.0000V, Extreme value:  reached
----------------------------------------------------------------
Analog voltage value: 
75.0000V, Extreme value:  reached
----------------------------------------------------------------
Analog voltage value: 
75.0000V, Extreme value:  reached
----------------------------------------------------------------
Analog voltage value: 
74.0000V, Extreme value:  reached
----------------------------------------------------------------

If you know how to fix this problem, please let me know.

2

Did you connect the module to A0 and D8?

Are you able to find a potentiometer position where the LED doesn't light up at normal background noise? If yes, try that one and post the values again.

3

pylon:
Did you connect the module to A0 and D8?

Are you able to find a potentiometer position where the LED doesn't light up at normal background noise? If yes, try that one and post the values again.

Yes, I've connected the wires to A0 and 8
and I also adjusted the potentiometer so the LED will on light up when there's sound and the LED seems to work fine but the analog input that I read from the arduino doesn't changed much.
This is the Serial monitor:

Analog voltage value: 
525.0000V, Extreme value:  not reached yet
----------------------------------------------------------------
Analog voltage value: 
524.0000V, Extreme value:  not reached yet
----------------------------------------------------------------
Analog voltage value: 
524.0000V, Extreme value:  not reached yet
----------------------------------------------------------------
Analog voltage value: 
562.0000V, Extreme value:  not reached yet
----------------------------------------------------------------
Analog voltage value: 
525.0000V, Extreme value:  not reached yet
----------------------------------------------------------------
Analog voltage value: 
526.0000V, Extreme value:  not reached yet
----------------------------------------------------------------
Analog voltage value: 
554.0000V, Extreme value:  not reached yet
----------------------------------------------------------------
Analog voltage value: 
574.0000V, Extreme value:  not reached yet
----------------------------------------------------------------
Analog voltage value: 
526.0000V, Extreme value:  not reached yet
----------------------------------------------------------------
Analog voltage value: 
525.0000V, Extreme value:  not reached yet
----------------------------------------------------------------
Analog voltage value: 
524.0000V, Extreme value:  not reached yet
----------------------------------------------------------------
Analog voltage value: 
524.0000V, Extreme value:  not reached yet
----------------------------------------------------------------
Analog voltage value: 
525.0000V, Extreme value:  not reached yet
----------------------------------------------------------------
Analog voltage value: 
524.0000V, Extreme value:  not reached yet
----------------------------------------------------------------
Analog voltage value: 
528.0000V, Extreme value:  not reached yet
----------------------------------------------------------------
Analog voltage value: 
461.0000V, Extreme value:  reached
----------------------------------------------------------------
Analog voltage value: 
525.0000V, Extreme value:  not reached yet
----------------------------------------------------------------
Analog voltage value: 
525.0000V, Extreme value:  not reached yet
----------------------------------------------------------------
Analog voltage value: 
526.0000V, Extreme value:  not reached yet
----------------------------------------------------------------
Analog voltage value: 
524.0000V, Extreme value:  not reached yet
----------------------------------------------------------------
Analog voltage value: 
525.0000V, Extreme value:  not reached yet
----------------------------------------------------------------
Analog voltage value: 
525.0000V, Extreme value:  not reached yet
----------------------------------------------------------------
Analog voltage value: 
524.0000V, Extreme value:  not reached yet
----------------------------------------------------------------
Analog voltage value: 
524.0000V, Extreme value:  not reached yet
----------------------------------------------------------------
Analog voltage value: 
525.0000V, Extreme value:  not reached yet
----------------------------------------------------------------
Analog voltage value: 
525.0000V, Extreme value:  not reached yet
----------------------------------------------------------------
Analog voltage value: 
525.0000V, Extreme value:  not reached yet
----------------------------------------------------------------
Analog voltage value: 
525.0000V, Extreme value:  not reached yet
----------------------------------------------------------------
Analog voltage value: 
524.0000V, Extreme value:  not reached yet
----------------------------------------------------------------
Analog voltage value: 
524.0000V, Extreme value:  not reached yet
----------------------------------------------------------------
Analog voltage value: 
524.0000V, Extreme value:  not reached yet
----------------------------------------------------------------
Analog voltage value: 
524.0000V, Extreme value:  not reached yet
----------------------------------------------------------------
Analog voltage value: 
524.0000V, Extreme value:  not reached yet
----------------------------------------------------------------
Analog voltage value: 
525.0000V, Extreme value:  not reached yet
----------------------------------------------------------------
Analog voltage value: 
524.0000V, Extreme value:  not reached yet
----------------------------------------------------------------
Analog voltage value: 
525.0000V, Extreme value:  not reached yet
----------------------------------------------------------------
Analog voltage value: 
524.0000V, Extreme value:  not reached yet
----------------------------------------------------------------
Analog voltage value: 
525.0000V, Extreme value:  not reached yet
----------------------------------------------------------------
Analog voltage value: 
525.0000V, Extreme value:  not reached yet
----------------------------------------------------------------
Analog voltage value: 
524.0000V, Extreme value:  not reached yet
----------------------------------------------------------------
Analog voltage value: 
525.0000V, Extreme value:  not reached yet
----------------------------------------------------------------
Analog voltage value: 
524.0000V, Extreme value:  not reached yet
----------------------------------------------------------------
Analog voltage value: 
523.0000V, Extreme value:  not reached yet
----------------------------------------------------------------
Analog voltage value: 
517.0000V, Extreme value:  not reached yet
----------------------------------------------------------------
Analog voltage value: 
525.0000V, Extreme value:  not reached yet
----------------------------------------------------------------
Analog voltage value: 
524.0000V, Extreme value:  not reached yet
----------------------------------------------------------------
Analog voltage value: 
513.0000V, Extreme value:  not reached yet
----------------------------------------------------------------
Analog voltage value: 
530.0000V, Extreme value:  not reached yet
----------------------------------------------------------------
Analog voltage value: 
525.0000V, Extreme value:  not reached yet
----------------------------------------------------------------
Analog voltage value: 
524.0000V, Extreme value:  not reached yet
----------------------------------------------------------------
Analog voltage value: 
524.0000V, Extreme value:  not reached yet
----------------------------------------------------------------
Analog voltage value: 
524.0000V, Extreme value:  not reached yet
----------------------------------------------------------------

I can still detect sound that way but the readings are some what noisy and the amplitude peaks from the sound are very small.

4

But now you never get the LED lit by the sound input. And I hope you understand that you're measuring a wave, so it depends a lot on the point in time when you are measuring what result you get. If you want to measure the sound intensity you might have to integrate some values to get value you can compare. It might even be an option to simply find the maximum spikes of the signal if you want to have a value of the noise in the environment.

5

Remove this statement:

  pinMode(analogP, INPUT);

It configures the pin as a digital input.
Maybe the analogRead that follows will work but might as well be sure of it.

Pete

6

analogRead doesn't know anything about the digital state of a pin at all, it just reads
the voltage of the pin, completely independently.