Arduino简单实例十二_蜂鸣器播放生日快乐

1)       说明：

蜂鸣器是一种一体化结构的电子讯响器，采用直流电压供电，广泛应用于计算电子玩具、定时器等电子产品中作发声器件。蜂鸣器分有源和无源。如果是有源的，单片机只要输出高低电平就可以，如果是无源的，单片机就要输出PWM波才可以让蜂鸣器发声。

2)       硬件：

5V有源蜂鸣器，Arduinouno，杜邦线

3)       连接：

正极连 ArduinoDigital 4负极连 Arduino GND

4)       ­­代码：

int PIN_SPEAKER = 4;int length = 25;char notes[] = "ggagCbggagDCggGECbaffECDC";int beats[] = {1,1,2,2,2,4, 1,1,2,2,2,4, 1,1,2,2,2,2,2, 1,1,2,2,2,4,1};int tempo = 300; void playTone(int tone, int duration) {  for (long i = 0; i < duration * 1000L; i += tone * 2) {    digitalWrite(PIN_SPEAKER, HIGH);    delayMicroseconds(tone);    digitalWrite(PIN_SPEAKER, LOW);    delayMicroseconds(tone);  }} void playNote(char note, int duration) {  char names[] = {'c', 'd', 'e', 'f', 'g', 'a', 'b', 'C', 'D', 'E', 'F', 'G'};  int tones[] = {1915, 1700, 1519, 1432, 1275, 1136, 1014, 956, 853, 759, 716, 637, 568};   for (int i = 0; i < 12; i++) {    if (names[i] == note) {      Serial.PRint("value:");      Serial.println(note);      playTone(tones[i]*2, duration);    }  }} void setup() {  pinMode(PIN_SPEAKER, 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);   }}（请注意：因各厂商硬件不同，引脚位置可能有差异,具体请见硬件说明书）