float c0 = 16.352; float d0 = 18.354; float e0 = 20.602; float f0 = 
21.827; float g0 = 24.500; float a0 = 27.500; float b0 = 30.868; 
float b3 = b0 * 8; float c4 = c0 * 16; float d4 = d0 * 16; float e4 = 
e0 * 16; float f4 = f0 * 16; float g4 = g0 * 16; float a4 = a0 * 16; 
float b4 = b0 * 16; float b4f = (b4 + a4) / 2; // b4 Бемоль (Flat) 
float c5 = c0 * 32; float d5 = d0 * 32; float f5 = f0 * 32; float g5 
= g0 * 32; float a5 = a0 * 32; float b5 = b0 * 32; float b5f = (b5 + 
a5) / 2; void setup() {
  pinMode(2, OUTPUT);
}
void play_tone(int port, float f, long t) { const long T = 1000000 / 
  f; // Период одного колебания long d = T / 2; // Половина периода 
  (Полупериод) int count = t / T; // Количество колебаний for (int k 
  = 0; k < count; k = k + 1) {
    digitalWrite(port, HIGH); delayMicroseconds(d); 
    digitalWrite(port, LOW); delayMicroseconds(d);
  }
}
float melody[89][2] = {
  // 1 такт
  {g4, 8}, {g4, 8}, {g4, 8}, {g4, 8}, {g4, 8}, {g4, 8}, {g4, 8}, {g4, 
  8},
  // 2
  {g4, 8}, {g4, 8}, {g4, 8}, {g4, 8}, {g4, 8}, {g4, 8}, {g4, 8}, {g4, 
  8},
  // 3
  {b4f, 8}, {b4f, 8}, {b4f, 8}, {b4f, 8}, {b4f, 8}, {b4f, 8}, {b4f, 
  8}, {b4f, 8},
  // 4
  {b4f, 8}, {b4f, 8}, {b4f, 8}, {b4f, 8}, {b4f, 8}, {b4f, 8}, {b4f, 
  8}, {b4f, 8},
  // 5
  {b4f, 8}, {b4f, 8}, {b4f, 8}, {b4f, 8}, {d5, 8}, {d5, 8}, {d5, 8}, 
  {d5, 8},
  // 6
  {c5, 8}, {c5, 8}, {c5, 8}, {c5, 8}, {f5, 8}, {f5, 8}, {f5, 8}, {f5, 
  8},
  // 7
  {g5, 8}, {g5, 8}, {g5, 8}, {g5, 8}, {g5, 8}, {g5, 8}, {g5, 8}, {g5, 
  8},
  // 8 (64)
  {g5, 8}, {g5, 8}, {g5, 8}, {g5, 8}, {c5, 8}, {b4f, 8}, {a4, 8}, 
  {f4, 8},
  // 9 (69)
  {g4, 4}, {g4, 8}, {d5, 8}, {c5, 4}, {b4f, 4},
  // 10 (75)
  {a4, 4}, {a4, 8}, {a4, 8}, {c5, 4}, {b4f, 8}, {a4, 8},
  // 11 (82)
  {g4, 4}, {g4, 8}, {b5f, 8}, {a5, 8}, {b5f, 8}, {a5, 8}, {b5f, 8},
  // 12 (89)
  {g4, 4}, {g4, 8}, {b5f, 8}, {a5, 8}, {b5f, 8}, {a5, 8}, {b5f, 8},
};
void loop() { const int BPM = 122; const long MINUTE = 60000000; 
  const long TAKT = (MINUTE / BPM) * 4; for (int n = 0; n < 89; n = n 
  + 1) {
    play_tone(2, melody[n][0], TAKT / melody[n][1] ); delay(10);
  }
}