STM32使用无源蜂鸣器演奏歌曲

1万 · 2017-1-14 21:43

使用了有源蜂鸣器，只能发出固定的”滴滴“声，当然不能满足于此呀。使用无源蜂鸣器，只要输出不同频率的PWM波，即可发出不同的音符。
不同的音符组合起来就是一个曲子了。

改变PWM的音调，可以输出Do re mi fa so la si do这样的7个音符，还可以输出不同音调的Do re mi fa so la si do。
在实例程序里面，我定义了低中高三个音阶。音符的频率则是mbed提供的。已经宏定义好了。
只要改变PWM的输出周期，即可发出不同的音调（频率是周期的倒数）。

为了方便起见，写了一个音阶类（Pitch），虚基类。里面有一个perform函数，参数是音符和持续时间。例如要发出Do这个声音，持续0.5s，只要perform(1,0.5)就好。
还有一个Stop函数，停止响声0.5s则stop（0.5），无参数则直接停止。后面的Low、Mid、High类则是派生类，实现了Pitch的虚函数。

程序里面包括：
1、发出低中高三个声调的Do re mi fa so la si do音。
2、中音版的小星星。
3、低音版的小星星。

1万 · 2017-1-14 21:44

复制

#include "mbed.h"



#define NOTE_B0  31



#define NOTE_C1  33



#define NOTE_CS1 35



#define NOTE_D1  37



#define NOTE_DS1 39



#define NOTE_E1  41



#define NOTE_F1  44



#define NOTE_FS1 46



#define NOTE_G1  49



#define NOTE_GS1 52



#define NOTE_A1  55



#define NOTE_AS1 58



#define NOTE_B1  62



#define NOTE_C2  65



#define NOTE_CS2 69



#define NOTE_D2  73



#define NOTE_DS2 78



#define NOTE_E2  82



#define NOTE_F2  87



#define NOTE_FS2 93



#define NOTE_G2  98



#define NOTE_GS2 104



#define NOTE_A2  110



#define NOTE_AS2 117



#define NOTE_B2  123



#define NOTE_C3  131



#define NOTE_CS3 139



#define NOTE_D3  147



#define NOTE_DS3 156



#define NOTE_E3  165



#define NOTE_F3  175



#define NOTE_FS3 185



#define NOTE_G3  196



#define NOTE_GS3 208



#define NOTE_A3  220



#define NOTE_AS3 233



#define NOTE_B3  247



#define NOTE_C4  262



#define NOTE_CS4 277



#define NOTE_D4  294



#define NOTE_DS4 311



#define NOTE_E4  330



#define NOTE_F4  349



#define NOTE_FS4 370



#define NOTE_G4  392



#define NOTE_GS4 415



#define NOTE_A4  440



#define NOTE_AS4 466



#define NOTE_B4  494



#define NOTE_C5  523



#define NOTE_CS5 554



#define NOTE_D5  587



#define NOTE_DS5 622



#define NOTE_E5  659



#define NOTE_F5  698



#define NOTE_FS5 740



#define NOTE_G5  784



#define NOTE_GS5 831



#define NOTE_A5  880



#define NOTE_AS5 932



#define NOTE_B5  988



#define NOTE_C6  1047



#define NOTE_CS6 1109



#define NOTE_D6  1175



#define NOTE_DS6 1245



#define NOTE_E6  1319



#define NOTE_F6  1397



#define NOTE_FS6 1480



#define NOTE_G6  1568



#define NOTE_GS6 1661



#define NOTE_A6  1760



#define NOTE_AS6 1865



#define NOTE_B6  1976



#define NOTE_C7  2093



#define NOTE_CS7 2217



#define NOTE_D7  2349



#define NOTE_DS7 2489



#define NOTE_E7  2637



#define NOTE_F7  2794



#define NOTE_FS7 2960



#define NOTE_G7  3136



#define NOTE_GS7 3322



#define NOTE_A7  3520



#define NOTE_AS7 3729



#define NOTE_B7  3951



#define NOTE_C8  4186



#define NOTE_CS8 4435



#define NOTE_D8  4699



#define NOTE_DS8 4978



//7个音符组成了美妙的音乐



//低   Do re mi fa so la si do

int melody[] = {  NOTE_C4, NOTE_D4,NOTE_E4, NOTE_F4, NOTE_G4,NOTE_A4,NOTE_B4,NOTE_C5};



//中   Do re mi fa so la si do

int melody2[] = {  NOTE_C5, NOTE_D5,NOTE_E5, NOTE_F5, NOTE_G5,NOTE_A5,NOTE_B5,NOTE_C6};



//高

int melody3[] = {  NOTE_C6, NOTE_D6,NOTE_E6, NOTE_F6, NOTE_G6,NOTE_A6,NOTE_B6,NOTE_C7};



//PWM输出口

PwmOut m(PB_13);



//音调类

class Pitch{

    

    

    public:

    

      virtual void perfrom(int,double)=0;

      

      void stop(double time = 0){

          

          if(time==0)

            m = 1;

          else{

              

            m = 1;

            wait(time);  

              

              

              }//end else

          

          }//end stop

   

};



class Low:public Pitch{

    

    public:

    void perfrom(int index,double time){

        

            

            m.period_us(1000000/melody[index-1]);



            m.write(0.5);

            

            wait(time);

    

        }

    

    

    

};



class Mid:public Pitch{

    

    public:

    void perfrom(int index,double time){

        

            

            m.period_us(1000000/melody2[index-1]);



            m.write(0.5);

            

            wait(time);

    

        }

    

    

    

};



class Hig:public Pitch{

    

    public:

    void perfrom(int index ,double time){

        

            

            m.period_us(1000000/melody3[index-1]);



            m.write(0.5);

            

            wait(time);

    

        }

    

    

    

};







int main()



{

    /*试音

      for (int thisNote = 0; thisNote < 8; thisNote++) {



        m.period_us(1000000/melody[thisNote]);



        m.write(0.5);



        wait(0.5);



      }

      

      for (int thisNote = 0; thisNote < 8; thisNote++) {



        m.period_us(1000000/melody2[thisNote]);



        m.write(0.5);



        wait(0.5);



      }

      

      for (int thisNote = 0; thisNote < 8; thisNote++) {



        m.period_us(1000000/melody3[thisNote]);



        m.write(0.5);



        wait(0.5);



      }

      

    m = 1;

    */

    

    

    /*中音版

    Mid mid;

    

    //11 55 66 5

    mid.perfrom(1,0.5);

    mid.perfrom(1,0.5);

    mid.perfrom(5,0.5);

    mid.perfrom(5,0.5);

    mid.perfrom(6,0.5);

    mid.perfrom(6,0.5);

    mid.perfrom(5,0.8);

    mid.stop(0.2);

    

    

    //44 33 22 1

    mid.perfrom(4,0.5);

    mid.perfrom(4,0.5);

    mid.perfrom(3,0.5);

    mid.perfrom(3,0.5);

    mid.perfrom(2,0.5);

    mid.perfrom(2,0.5);

    mid.perfrom(1,0.5);

    mid.stop(0.2);

    

    //55 44 33 2

    mid.perfrom(5,0.5);

    mid.perfrom(5,0.5);

    mid.perfrom(4,0.5);

    mid.perfrom(4,0.5);

    mid.perfrom(3,0.5);

    mid.perfrom(3,0.5);

    mid.perfrom(2,0.5);    

    mid.stop(0.2);

        

    //55 44 33 2    

    mid.perfrom(5,0.5);

    mid.perfrom(5,0.5);

    mid.perfrom(4,0.5);

    mid.perfrom(4,0.5);

    mid.perfrom(3,0.5);

    mid.perfrom(3,0.5);

    mid.perfrom(2,0.5); 

    mid.stop(0.2);

    

    //11 55 66 5

    mid.perfrom(1,0.5);

    mid.perfrom(1,0.5);

    mid.perfrom(5,0.5);

    mid.perfrom(5,0.5);

    mid.perfrom(6,0.5);

    mid.perfrom(6,0.5);

    mid.perfrom(5,0.5);

    mid.stop(0.2);

    

    //44 33 22 1

    mid.perfrom(4,0.5);

    mid.perfrom(4,0.5);

    mid.perfrom(3,0.5);

    mid.perfrom(3,0.5);

    mid.perfrom(2,0.5);

    mid.perfrom(2,0.5);

    mid.perfrom(1,0.5);

    

    

    mid.stop();

    */

    

    

    //低音版

    

    Low low;

    

        

    //11 55 66 5

    low.perfrom(1,0.5);

    low.perfrom(1,0.5);

    low.perfrom(5,0.5);

    low.perfrom(5,0.5);

    low.perfrom(6,0.5);

    low.perfrom(6,0.5);

    low.perfrom(5,0.8);

    low.stop(0.2);

    

    

    //44 33 22 1

    low.perfrom(4,0.5);

    low.perfrom(4,0.5);

    low.perfrom(3,0.5);

    low.perfrom(3,0.5);

    low.perfrom(2,0.5);

    low.perfrom(2,0.5);

    low.perfrom(1,0.5);

    low.stop(0.2);

    

    //55 44 33 2

    low.perfrom(5,0.5);

    low.perfrom(5,0.5);

    low.perfrom(4,0.5);

    low.perfrom(4,0.5);

    low.perfrom(3,0.5);

    low.perfrom(3,0.5);

    low.perfrom(2,0.5);    

    low.stop(0.2);

        

    //55 44 33 2    

    low.perfrom(5,0.5);

    low.perfrom(5,0.5);

    low.perfrom(4,0.5);

    low.perfrom(4,0.5);

    low.perfrom(3,0.5);

    low.perfrom(3,0.5);

    low.perfrom(2,0.5); 

    low.stop(0.2);

    

    //11 55 66 5

    low.perfrom(1,0.5);

    low.perfrom(1,0.5);

    low.perfrom(5,0.5);

    low.perfrom(5,0.5);

    low.perfrom(6,0.5);

    low.perfrom(6,0.5);

    low.perfrom(5,0.5);

    low.stop(0.2);

    

    //44 33 22 1

    low.perfrom(4,0.5);

    low.perfrom(4,0.5);

    low.perfrom(3,0.5);

    low.perfrom(3,0.5);

    low.perfrom(2,0.5);

    low.perfrom(2,0.5);

    low.perfrom(1,0.5);

    

    

    low.stop();

    

}

1万 · 2017-1-14 21:45

蜂鸣器比较刺耳其实，听久了还是很难受。

在代码里面是不能调节音量的，要调低音量，加个电阻就好。最大的音量是无电阻+高电压。

1万 · 2017-1-14 21:46