// * Composed by : I do not know
// * Coded By : https://code.google.com/p/rbots/source/browse/trunk/StarterKit/Lesson5_PiezoPlayMelody/Lesson5_PiezoPlayMelody.pde
// * Use BSD Clause 2 License for Distribution
// * Collection by GitHub User @abhishekghosh - https://github.com/AbhishekGhosh/Arduino-Buzzer-Tone-Codes
// * Program to choose between two melodies by using a potentiometer and a piezo buzzer.

// TONES //
// Defining the relationship between note, period & frequency. 
 
// period is in microsecond so P = 1/f * (1E6)
 
#define  c3    7634
#define  d3    6803
#define  e3    6061
#define  f3    5714
#define  g3    5102    // 196 Hz
#define  a3    4545
#define  b3    4049
#define  c4    3816    // 261 Hz 
#define  d4    3401    // 294 Hz 
#define  e4    3030    // 329 Hz 
#define  f4    2865    // 349 Hz 
#define  g4    2551    // 392 Hz 
#define  a4    2272    // 440 Hz 
#define  a4s   2146
#define  b4    2028    // 493 Hz 
#define  c5    1912    // 523 Hz
#define  d5    1706
#define  d5s   1608
#define  e5    1517    // 659 Hz
#define  f5    1433    // 698 Hz
#define  g5    1276
#define  a5    1136
#define  a5s   1073
#define  b5    1012
#define  c6    955
#define  R     0      // Define a special note, 'R', to represent a rest

//how manny strummings / min
long tempo = 160; // Set overall tempo
 
int pause = 1000; // Set length of pause between notes
 
int rest_count = 50; // Loop variable to increase Rest length (BLETCHEROUS HACK; See NOTES)


int melody1[] = { e4, b3, g3, d3, a3, e3 };
#define M_SIZE  (sizeof(melody1)/sizeof(int))

// SETUP //
 
int speakerOut = 10;    // Set up speaker on digital pin 7
int potPin = A0;      // Set up potentiometer on analogue pin 0.
 
 
void setup() { 
  pinMode(speakerOut, OUTPUT);
    //Serial.begin(9600); // Set serial out if we want debugging
  } 

// Initialize core variables
int toneM = 0;
int beat = 0;
long duration  = 0;

// PLAY TONE  //
// Pulse the speaker to play a tone for a particular duration
void playTone() {
  long elapsed_time = 0;
  if (toneM > 0) { // if this isn't a Rest beat, while the tone has 
    //  played less long than 'duration', pulse speaker HIGH and LOW
    while (elapsed_time < duration) {
 
      digitalWrite(speakerOut,HIGH);
      delayMicroseconds(toneM / 2);
 
      // DOWN
      digitalWrite(speakerOut, LOW);
      delayMicroseconds(toneM / 2);
 
      // Keep track of how long we pulsed
      elapsed_time += (toneM);

      //decrease freq by 10
      toneM -= 5;
    } 
  }
  else { // Rest beat; loop times delay
    for (int j = 0; j < rest_count; j++) { // See NOTE on rest_count
      delayMicroseconds(duration);  
    }                                
  }                                 
}

void playChord() {

  for(int i=0; i < M_SIZE; i++){
    toneM = melody1[i];
    beat = 1;

    //beats every minute = tempo
    //beats
    duration = beat * (60000/160) * 1000; // Set up timing ms to us
 
    playTone(); // A pause between notes
    //delayMicroseconds(pause);
  }
}

// LOOP //
void loop() {

  playChord();
  delay(1000); //delay ms

}