#define frequency notes
 #define  C     65.406
 #define  A     55.000
 #define  B     61.735 
 #define  E     82.407
 #define  F     87.307
 #define  G     97.499
 #define  D     73.416

 #define  R     0
 // define pin
int speakerOut = 26;
int DEBUG = 1;
void setup() {
  pinMode(speakerOut, OUTPUT);
  if (DEBUG) {
    Serial.begin(9600); 
  }
}

double melody[] = {
  //add melody notes here
  C, D, C, F, E, R,
  C, D, C, G, F, R,
  C, C, A, F, E, D, R,
  B, A, F, G, F, R
};
int MAX_COUNT = sizeof(melody) / 2; 

long tempo = 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);
      delay(tone_/2);
      digitalWrite(speakerOut, LOW);
      delay(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*tempo;
    playTone();


    delayMicroseconds(paaus); 
  }  
 }