Page 258 - 최강 아두이노 퍼스트 참고서

int speakerPin = 9;

int length = 15; // the number of notes char notes[] =
"ccggaagffeeddc "; // a space represents a rest int beats[] = { 1, 1, 1,
1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 2, 4 }; int tempo = 300;

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 };

// play the tone corresponding to the note name for (int i =
0; i < 8; i++)
{ if (names[i] == note)
{ playTone(tones[i], duration);
}
}
}

void setup()
{

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