#define  C     2109.89
#define  D     1879.69
#define  E     1674.62
#define  f     1580.63
#define  G     1408.18
#define  R     0

// define pin
int speakerOut = 26;
int DEBUG = 1;

void setup() {
   pinMode(speakerOut, OUTPUT);
   if (DEBUG) {
     Serial.begin(9600);
   }
 }

 double melody[] = {E, E, E,R,
 E, E, E,R,
 E, G, C, D, E, R,
 f, f, f,f, f, E, E,E, E, D ,D,E, D, R, G ,R,
 E, E, E,R,
 E, E, E,R,
 E, G, C, D, E, R,
 f, f, f,f, f, E, E, E,  G,G, f, D, C,R};

 int max_count = sizeof(melody)/2;
 int temp = 10000;
 int paaus = 1000;
 int rest_count = 2;
 int tone_ = 0;
 int beat = 0;
 long duration = 0;
 void playTone(){
  long elapsed_time = 0;
  if (tone_>0){
    while (elapsed_time < duration){
      digitalWrite(speakerOut, HIGH);
      delayMicroseconds(tone_/2);
      digitalWrite(speakerOut, LOW);
      delayMicroseconds(tone_/2);
      elapsed_time += tone_;
    }
  }
  else {
    for (int j = 0; j<rest_count; j++){
      delayMicroseconds(duration);
    }
  }
 }
 void loop(){
  for (int i = 0; i<max_count; i++){
    tone_ = melody[i];
    beat = 50;
    duration = beat * temp;
    playTone();
    delayMicroseconds(paaus);
  }
 }