#define  C     277.81
  #define c      261.63
 #define  D     293.66
 #define  E     329.63
 #define  F     349.23
 #define  G     392.00
 #define  A     440.00
 #define  B     493.88
 #define  R     0
 // define pin
 int speakerOut = 26;
 int DEBUG = 1;
 void setup() {
   pinMode(speakerOut, OUTPUT);
   if (DEBUG) {
     Serial.begin(9600); 
   }
 }
 
 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 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*tempo;
    playTone();
    delayMicroseconds(paaus);
  }







  
 }