直接上程序：arduino控制蜂鳴器播放《小星星》
- 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() {
- pinMode(speakerPin, OUTPUT);
- }
- void loop() {
- for (int i = 0; i < length; i++) {
- if (notes[i] == ' ') {
- delay(beats[i] * tempo); // rest
- } else {
- playNote(notes[i], beats[i] * tempo);
- }
- // pause between notes
- delay(tempo / 2);
- }
- }
再獻上一例程：通過模擬電位器模塊控制蜂鳴器發(fā)聲頻率
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