/*
Buzzer
* Note:
This example code is in the public domain.
*/
/* Macro Define */
#define BUZZER_PIN 19 /* sig pin of the buzzer */
int length = 10; /* the number of notes */
char notes[] = "ccggaaffeeddc "; /* the notes */
int beats[] = { 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 2, 4 }; /* the beats*/
int tempo = 300; /* the tempo */
void setup()
{
/* set buzzer pin as output */
pinMode(BUZZER_PIN, OUTPUT);
}
void loop()
{
for(int i = 0; i < length; i++) {
if(notes[i] == ' ') {
delay(beats[i] * tempo);
} else {
playNote(notes[i], beats[i] * tempo);
}
delay(tempo / 2); /* delay between notes */
}
}
/* play tone */
void playTone(int _tone, int duration) {
for(long i = 0; i < duration * 1000L; i += _tone*2 ) {
digitalWrite(BUZZER_PIN, HIGH);
delayMicroseconds(_tone);
digitalWrite(BUZZER_PIN, LOW);
delayMicroseconds(_tone);
}
}
/* play notes */
void playNote(char note, int duration) {
char name[] = {'c', 'd', 'e', 'f', 'g', 'a', 'b', 'c'};
int _tone[] = {1915, 1700, 1519, 1432, 1275, 1136, 1014, 956};
/* play the tone corresponding to the tone name */
for(int i = 0; i < 8; i++) {
if(name[i] == note) {
playTone(_tone[i], duration);
}
}
}