108个传感器之-无源蜂鸣器（12）

介绍

使用此模块，您可以通过使用PWM信号来控制被动压电蜂鸣器来生成不同的声音。PWM信号是特殊的电信号，可以以不同的频率发送以产生不同的声音。蜂鸣器可以产生1.5 kHz至2.5 kHz的声音。它的电压为3.3 V至5 V，且小巧，紧凑，尺寸为18.5 x 15 mm。如果您在项目中需要声信号或警报音调并且易于集成，则此模块是理想的选择。

Technical Data
Operating voltage	3,3 V - 5 V
Tone generation range	1,5 kHz - 2,5 kHz
Dimensions	18,5 x 15 mm

引脚连接

pin 引脚连接开发板的 gpio 接口即可：

Arduino	Sensor
Pin 3	Signal
-	+V
GND	GND

代码示例

1. 普通版

int buzzer = 8 ; // Declaration of the buzzer output pin
 
void setup() {
  pinMode(buzzer, OUTPUT); // Initialization as output pin
}
void loop() {
  unsigned char i;
  while(1) {
    // In this program, the buzzer is controlled alternately with two different frequencies
    // The signal here consists of a square wave voltage.
    // Turning the buzzer on and off then generates a tone that corresponds approximately to the frequency.
    // The frequency is defined by how long the on and off phases are
     
    // 1.frequency
    for(i = 0; i <80; i++) {
      digitalWrite(buzzer, HIGH);
      delay(1);
      digitalWrite(buzzer, LOW);
      delay(1);
    }

    // 1 second pause
    delay(1000);

    // 2.frequency
    for(i = 0; i <100; i++) {
      digitalWrite(buzzer, HIGH);
      delay(2) ;
      digitalWrite(buzzer, LOW);
      delay(2);
    }

    // 1 second pause
    delay(1000);
  }
}

小结

待完善…