/*
 * Buzzer Sargam - Hindustani Classical Music on Barduino
 * Fab Academy 2026 - Week 4: Embedded Programming
 * Shivangi Pande | Fab Lab Barcelona
 *
 * Maps the 7 swaras of Hindustani classical music
 * to frequencies and plays them through the Barduino buzzer (pin 46).
 *
 * Swara → Frequency (Hz) — based on C4 scale approximation:
 *   Sa  = 261  (C4)
 *   Re  = 293  (D4)
 *   Ga  = 329  (E4)
 *   Ma  = 349  (F4)
 *   Pa  = 392  (G4)
 *   Dha = 440  (A4)
 *   Ni  = 493  (B4)
 *   Sa' = 523  (C5 — upper Sa)
 */

// ---- Pin definitions ----
#define BUZZER_PIN 46

// ---- Swara frequencies (Hz) ----
#define SA   261
#define RE   293
#define GA   329
#define MA   349
#define PA   392
#define DHA  440
#define NI   493
#define SA_H 523  // Upper Sa

// ---- Timing ----
#define BEAT     400   // Duration of one beat (ms)
#define PAUSE    50    // Silence between notes (ms)

void playNote(int frequency, int duration) {
  tone(BUZZER_PIN, frequency, duration);
  delay(duration + PAUSE);
}

void setup() {
  pinMode(BUZZER_PIN, OUTPUT);
  Serial.begin(115200);
  Serial.println("Buzzer Sargam — Sa Re Ga Ma Pa Dha Ni Sa");
}

void loop() {
  // --- Ascending scale: Aaroha ---
  Serial.println("Aaroha (ascending):");
  playNote(SA,   BEAT);
  playNote(RE,   BEAT);
  playNote(GA,   BEAT);
  playNote(MA,   BEAT);
  playNote(PA,   BEAT);
  playNote(DHA,  BEAT);
  playNote(NI,   BEAT);
  playNote(SA_H, BEAT * 2);  // Hold upper Sa

  delay(500);

  // --- Descending scale: Avroha ---
  Serial.println("Avroha (descending):");
  playNote(SA_H, BEAT);
  playNote(NI,   BEAT);
  playNote(DHA,  BEAT);
  playNote(PA,   BEAT);
  playNote(MA,   BEAT);
  playNote(GA,   BEAT);
  playNote(RE,   BEAT);
  playNote(SA,   BEAT * 2);  // Hold lower Sa

  delay(1000);

  // --- Simple melody: "Twinkle Twinkle" in swaras ---
  // Sa Sa Pa Pa Dha Dha Pa —
  Serial.println("Melody:");
  playNote(SA,  BEAT);
  playNote(SA,  BEAT);
  playNote(PA,  BEAT);
  playNote(PA,  BEAT);
  playNote(DHA, BEAT);
  playNote(DHA, BEAT);
  playNote(PA,  BEAT * 2);

  // Ma Ma Ga Ga Re Re Sa —
  playNote(MA,  BEAT);
  playNote(MA,  BEAT);
  playNote(GA,  BEAT);
  playNote(GA,  BEAT);
  playNote(RE,  BEAT);
  playNote(RE,  BEAT);
  playNote(SA,  BEAT * 2);

  delay(2000);  // Pause before repeating
}