float frequency;


void setup() {
  Serial.begin(9600);
}

void loop() {

  frequency = 452.89295;
  //452.89373 browser A4 grenze



  frequency = 24652;
  Serial.println(pitch(frequency));


  delay(2000);
}



String pitch(float frequency) {

  static const String pitch1[] = {
    "G#", "A", "A#", "B", "C", "C#", "D", "D#", "E", "F", "F#", "G"
  };

  static const String pitch2[] = {
    "Ab", "A", "Bb", "B", "C", "Db", "D", "Eb", "E", "F", "Gb", "G"
  };

  float n = 49 + 12 * log(frequency / 440.0) / log(2);

  if (n >= 0) {
    float center = n - int(n + 0.5);

    Serial.println("Abweichung: " + String(center * 100, 8) + " %");
  }





  if (n < 0) {
    return pitch1[11 + (int(n + 0.5) % 12)] + String((int(n + 0.5) - 4) / 12);
  } else {
    return pitch1[int(n + 0.5) % 12] + String((int(n + 0.5) + 8) / 12);
  }
}