37种传感器（十八）无源蜂鸣器模块+Stduino Nano&UNO

37种传感器（十八）之无源蜂鸣器模块+Stduino Nano&UNO

本文转载自：http://www.stduino.com/forum.php?mod=viewthread&tid=44&extra=page%3D1=

关键词：
51、stm32、arduino、stduino单片机、stduino UNO&Nano、无源蜂鸣器模块

说明：
我们已经在第十六讲介绍过有源蜂鸣器，因此这里只介绍无源蜂鸣器。

无源蜂鸣器没有震荡源，因此需要通过脉宽调制（PWM）输入特定的方波电压信号来发声。PWM原理可在其他教程中查找，本系列主要介绍传感器。
演奏一首音乐，最重要的每个音的音调（频率）和节拍（时长）。

C调音符对应的音调频率如下图：（每两个音调频率相差
）

我们可以通过tone(pin,frequnce)函数来控制无源蜂鸣器的振动频率，利用delay()来控制节拍，利用noTone(pin)来终止振动。

实验目的：
控制无源蜂鸣器演奏《天空之城》。天空之城是C调，一拍为四分之一音符长度，每一小节为四拍。
黑点在上为高音，在下为低音，没有为中音乐。而每两个竖杠之间为一小节，每一小节共有四个四分之一拍。下面如果画了一条横线，则是四分之一拍的二分之一，即八分之一拍；画了两条横线，则是四分之一的四分之一，即十六分之一拍。音符后面的横线则是前一音符的延续。

器材：
Stduino UNO/Nano;杜邦线、无源蜂鸣器模块

电路连接：

代码展示：

#define C0 (2)

#define C1_LOW  (262)
#define C2_LOW  (294)
#define C3_LOW  (330)
#define C4_LOW  (349)
#define C5_LOW  (392)
#define C6_LOW  (440)
#define C7_LOW  (494)

#define C1      (523)
#define C2      (587)
#define C3      (659)
#define C4      (698)
#define C4S     (740)//C4#
#define C5      (784)
#define C5S     (831)//C5#
#define C6      (880)
#define C7      (988)

#define C1_HIGH (1046)
#define C2_HIGH (1175)
#define C3_HIGH (1318)
#define C4_HIGH (1397)
#define C5_HIGH (1568)
#define C6_HIGH (1760)
#define C7_HIGH (1976)

#define WHOLE (1)
#define HALF (0.5)
#define QUARTER (0.25)
#define EIGHTH (0.125)
#define SIXTEENTH (0.0625)

int tune[]=                 //根据简谱列出各频率
{
    C6,C7,
   
    C1_HIGH,C7,C1_HIGH,C3_HIGH,//
    C7,C3,C3,
    C6,C5,C6,C1_HIGH,
    C5,C0,C3,C3,
    C4,C3,C4,C1_HIGH,
    C3,C0,C1_HIGH,C1_HIGH,C1_HIGH,
    C7,C4S,C4S,C7,
   
    C7,C0,C6,C7,//
    C1_HIGH,C7,C1_HIGH,C3_HIGH,
    C7,C0,C3,C3,
    C6,C5,C6,C1_HIGH,
    C5,C0,C3,
    C4,C1_HIGH,C7,C7,C1_HIGH,
    C2_HIGH,C2_HIGH,C3_HIGH,C1_HIGH,C0,
   
    C1_HIGH,C7,C6,C6,C7,C5S,//
    C6,C0,C1_HIGH,C2_HIGH,
    C3_HIGH,C2_HIGH,C3_HIGH,C5_HIGH,
    C2_HIGH,C0,C5,C5,
    C1_HIGH,C7,C1_HIGH,C3_HIGH,C0,C0,
    C6,C7,C1_HIGH,C7,C2_HIGH,C2_HIGH,
    C1,C5,C5,C0,
   
    C4_HIGH,C3_HIGH,C2_HIGH,C1_HIGH,//
    C3_HIGH,
    C3_HIGH,C0,C3_HIGH,
    C6_HIGH,C5_HIGH,C5_HIGH,
    C3_HIGH,C2_HIGH,C1_HIGH,C0,C1_HIGH,
    C2_HIGH,C1_HIGH,C2_HIGH,C2_HIGH,C5_HIGH,
    C3_HIGH,C0,C3_HIGH,
    C6_HIGH,C5_HIGH,
    C3_HIGH,C2_HIGH,C1_HIGH,C0,C1_HIGH,
    C2_HIGH,C1_HIGH,C2_HIGH,C2_HIGH,C7,

    C6,C0,C6,C7,
   
    C6
};
float durt[]=                   //根据简谱列出各节拍
{
    EIGHTH,EIGHTH,
   
    QUARTER + EIGHTH,EIGHTH,QUARTER,QUARTER,
    QUARTER + QUARTER + QUARTER,EIGHTH,EIGHTH,
    QUARTER + EIGHTH,EIGHTH,QUARTER,QUARTER,
    QUARTER + QUARTER,QUARTER,EIGHTH,EIGHTH,
    QUARTER + EIGHTH,EIGHTH,EIGHTH,QUARTER+EIGHTH,
    QUARTER + QUARTER,QUARTER,EIGHTH,EIGHTH,EIGHTH,
    QUARTER + EIGHTH,EIGHTH,QUARTER,QUARTER,
   
    QUARTER+QUARTER,QUARTER,EIGHTH,EIGHTH,
    QUARTER+EIGHTH,EIGHTH,QUARTER,QUARTER,
    QUARTER+QUARTER,QUARTER,EIGHTH,EIGHTH,
    QUARTER+EIGHTH,EIGHTH,QUARTER,QUARTER,
    QUARTER+QUARTER+QUARTER,EIGHTH,EIGHTH,
    QUARTER,EIGHTH,EIGHTH,EIGHTH,QUARTER,
    EIGHTH,EIGHTH,EIGHTH,QUARTER,QUARTER,
   
    QUARTER,EIGHTH,EIGHTH,EIGHTH,QUARTER,QUARTER,
    QUARTER+QUARTER,QUARTER,EIGHTH,EIGHTH,
    QUARTER+EIGHTH,QUARTER,QUARTER,QUARTER,
    QUARTER+QUARTER,QUARTER,EIGHTH,EIGHTH,
    EIGHTH,EIGHTH,QUARTER,QUARTER,
    QUARTER+QUARTER,QUARTER,QUARTER,
    EIGHTH,EIGHTH,QUARTER,QUARTER,EIGHTH,EIGHTH,
    QUARTER+EIGHTH,EIGHTH,QUARTER,QUARTER,
   
    QUARTER,QUARTER,QUARTER,QUARTER,
    QUARTER+QUARTER+QUARTER,
    QUARTER+QUARTER,QUARTER,QUARTER,
    QUARTER+QUARTER,QUARTER,QUARTER,
    EIGHTH,EIGHTH,QUARTER,EIGHTH,EIGHTH,
    QUARTER,EIGHTH,EIGHTH,EIGHTH,QUARTER,
    QUARTER+QUARTER,QUARTER,QUARTER,
    QUARTER+QUARTER,QUARTER+QUARTER,
    EIGHTH,EIGHTH,QUARTER+QUARTER,EIGHTH,EIGHTH,
    QUARTER,EIGHTH,EIGHTH,EIGHTH,QUARTER,
    QUARTER+QUARTER,QUARTER,EIGHTH,EIGHTH,
   
    QUARTER+QUARTER+QUARTER
   
};

int Time = 2000;
int BUZZER = A0;

int length;

void setup()
{
  // put your setup code here, to run once:

    length=sizeof(tune)/sizeof(tune[0]);   //计算长度
}

void loop()
{
  // put your main code here, to run repeatedly:
    for(int i=0;i<length;i++)
    {
        if(tune[i]!=0)
        {
            tone(BUZZER,tune[i]);
        }  
        else
        {
            noTone(BUZZER);
        }
        delay(Time*durt[i]); //这里用来乐曲速度。
    }
    delay(2000);
}