//micDetectA.ino
int MIC = 5; // cds connected

int val = 0;
int sound = 0;
float MAX = 900.0;
float MIN = 300.0;

void setup (){
  pinMode(LED, OUTPUT);
  Serial.begin(115200);
}

void loop(){
  val = analogRead(MIC);
  sound = int( (MAX-float(val))/(MAX-MIN)*255.0 );
  if(sound > 255) {
     sound = 255;
  } else if (sound < 0) {
     sound = 0;
  }

  if( Serial.available() > 0 ){
    Serial.write(sound);
    Serial.read();
  }
}