gistfile1.cpp

int speakerPin = 12;
int length = 23;
// d r m f s ra t do
// c d e f g  a b C
char notes[] = "agg egaabg agggagg gaa";
int beats[]={1,1,2,1,1,1,1,1,2,1,1,1,1,1,1,1,1,2,1,1,1,2};
int tempo =300;

/********************************************************************************************/
void setup()
{
  pinMode(speakerPin,OUTPUT);
}
/********************************************************************************************/

void loop()
{
  for(int i =0;i<length;i++)
  {
  if(notes[i]==' ')
    {
      delay(beats[i]*tempo);
    }
    else
    {
      playNote(notes[i], beats[i]*tempo);
    }
    delay(tempo/2);
  }
}

/********************************************************************************************/
void playTone(int tone,int duration)
  {
    for (long i =0;i<duration * 1000L;i += tone * 2)
    {
      digitalWrite(speakerPin,HIGH);
      delayMicroseconds(tone);
      digitalWrite(speakerPin,LOW);
      delayMicroseconds(tone);
    }
  }
  
/********************************************************************************************/  
void playNote(char note, int duration)
  {
    char names[]={'c','d','e','f','g','a','b','C'};
    int tones[]={1915,1700,1519,1432,1275,1136,1014,956};
  
    for(int i = 0; i < 8 ; i++)
      {
         if(names[i] == note)
          {
            playTone(tones[i], duration);
          }
      }
 }
/********************************************************************************************/