Ode to Joy

ode.c

const int SPEAKER1 = 13;
const int SPEAKER2 = 11;

const int PITCH[8] = { 727, 647, 611, 545, 485, 458, 408, 363 };

char PITCH1[61] = { 
   'E', 'E', 'F', 'G', 'G', 'F', 'E', 'D', 'C', 'C', 'D', 'E', 'E', 'D', 'D', 
   'E', 'E', 'F', 'G', 'G', 'F', 'E', 'D', 'C', 'C', 'D', 'E', 'D', 'C', 'C',
   'D', 'E', 'C', 'D', 'E', 'F', 'E', 'C', 'D', 'E', 'F', 'E', 'D', 'C', 'D', 'G',
   'E', 'E', 'F', 'G', 'G', 'F', 'E', 'D', 'C', 'C', 'D', 'E', 'D', 'C', 'C'
};

char PITCH2[14] = { 
   'C', 'G', 'C', 'G',
   'C', 'G', 'C', 'G',
   'G',
   'C', 'G', 'C', 'G', 'C'
};

int DURATION1[61] = { 
   4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 6, 2, 8,
   4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 6, 2, 8,
   8, 4, 4, 4, 2, 2, 4, 4, 4, 2, 2, 4, 4, 4, 4, 8,
   4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 6, 2, 8
};

int DURATION2[14] = { 
   16, 16, 16, 16,
   16, 16, 16, 16,
   64,
   16, 16, 16, 8, 8
};

const long DURATION = 15000;

long i;
int pos1, pos2;
int pitch1, pitch2;
int peakCycles1, peakCycles2;
long noteCycles1, noteCycles2;
int state1, state2;

void setup ()
{
  pinMode (SPEAKER1, OUTPUT);
  pinMode (SPEAKER2, OUTPUT);
  
  state1 = LOW;
  state2 = LOW;
  
  pos1 = pos2 = 0;
  
  pitch1 = PITCH[PITCH1[0] - ((int)'A')] / 2;
  pitch2 = PITCH[PITCH2[0] - ((int)'A')];
  
  peakCycles1 = pitch1;
  peakCycles2 = pitch2;
  
  noteCycles1 = DURATION * DURATION1[0];
  noteCycles2 = DURATION * DURATION2[0];
}

void loop() {
   peakCycles1--;
   
   if (peakCycles1 == 0) {
     state1 = state1 == LOW ? HIGH : LOW;
     digitalWrite(SPEAKER1, state1);
     peakCycles1 = pitch1;
   }
   
   peakCycles2--;
   
   if (peakCycles2 == 0) {
     state2 = state2 == LOW ? HIGH : LOW;
     digitalWrite(SPEAKER2, state2);
     peakCycles2 = pitch2;
   }
   
   noteCycles1--;
   
   if (noteCycles1 == 0) {
     pos1++;
     if (pos1 >= sizeof(PITCH1)) {
       pos1 = 0;
     }
     noteCycles1 = DURATION * DURATION1[pos1];
     pitch1 = PITCH[PITCH1[pos1] - ((int)'A')] / 2;
   }
   
   noteCycles2--;

   if (noteCycles2 == 0) {
     pos2++;
     if (pos2 >= sizeof(PITCH2)) {
       pos2 = 0;
     }
     noteCycles2 = DURATION * DURATION2[pos2];
     pitch2 = PITCH[PITCH2[pos2] - ((int)'A')];
   }
}