Sound-Sensor is not working

Other Hardware Sensors
4

Like @TomGeorge pointed out, the output is digital and so will be HIGH (no sound) or LOW (sound).

Try this code:

const int soundPin = 7;

int soundVal;

void setup ()
{
   pinMode (soundPin, INPUT);
   Serial.begin(9600); // open the serial port at 9600 bps:
}

void loop ()
{
   soundVal = digitalRead(soundPin);
   if (soundVal == LOW)
   {
      Serial.print("Sound detected");
   }
}

You may need to adjust the sensitivity (blue pot) to get an output.

There is more example code on the page that you linked.

Sorry, Tom. I meant to reply to the OP.