int BUZZER =26;
#define C 2109.89
#define D 1879.69
#define E 1674.62
#define A 1254.55
#define G 1408.18
#define F 1580.63
#define B 1117.67

double melody[]={C,D,C,F,E,C,D,C,G,F,C,C,A,F,E,D,B,A,F,G,F};

int max_count = sizeof(melody)/2;
long tempo = 10000;
int pause_= 1000;
int restcount = 2;
int tone_ = 0;
int beat=0;
long duration=0;


void setup(){
 Serial.begin(9600);
 pinMode(BUZZER,OUTPUT);

}

void loop(){
  for(int i=0;i<max_count;i++)
  {
    tone_=melody[i];
    beat=50;
    duration=beat*tempo;
    playTone();
    delayMicroseconds(pause_);

  }

}

void playTone(){
  long elapsedTime = 0;
  if(tone_ >0)
  {
    while(elapsedTime<duration)
    {
      digitalWrite(BUZZER,HIGH);
      delayMicroseconds(tone_/2);
      digitalWrite(BUZZER,LOW);
      delayMicroseconds(tone_/2);
      elapsedTime+=tone_;

    }

  }
  else{
    for(int j=0;j<restcount;j++)
    {
      delayMicroseconds(duration);

    }
  }
}