單片機控制蜂鳴器發聲的基本原理和方法：只需對驅動口輸出驅動電平并通過放大電路放大驅動電流就能使蜂鳴器發出聲音。改變引腳的頻率，就可以調整蜂鳴器的音調，產生各種不同的聲音。
同時改變輸出電平的高低電平占空比，則可以控制蜂鳴器的聲音大小

下面給出代碼

main.c

(這里注意要把數組類型從char改為int要不然字符數組存不下，音樂不會完整播放），更改SPEED可改變曲子的播放速度。

#include <REGX52.H>#include "Delay.h" #include "Timer0.h"//蜂鳴器端口定義 sbit Buzzer=P2^5;//播放速度，值為四分音符的時長(ms) #define SPEED 700//音符與索引對應表，P：休止符，L：低音，M：中音，H：高音，下劃線：升半音符號# #define P 0 #define L1 1 #define L1_ 2 #define L2 3 #define L2_ 4 #define L3 5 #define L4 6 #define L4_ 7 #define L5 8 #define L5_ 9 #define L6 10 #define L6_ 11 #define L7 12 #define M1 13 #define M1_ 14 #define M2 15 #define M2_ 16 #define M3 17 #define M4 18 #define M4_ 19 #define M5 20 #define M5_ 21 #define M6 22 #define M6_ 23 #define M7 24 #define H1 25 #define H1_ 26 #define H2 27 #define H2_ 28 #define H3 29 #define H4 30 #define H4_ 31 #define H5 32 #define H5_ 33 #define H6 34 #define H6_ 35 #define H7 36//索引與頻率對照表 unsigned int FreqTable[]={0,63628,63731,63835,63928,64021,64103,64185,64260,64331,64400,64463,64528,64580,64633,64684,64732,64777,64820,64860,64898,64934,64968,65000,65030,65058,65085,65110,65134,65157,65178,65198,65217,65235,65252,65268,65283, };//樂譜 unsigned int code Music[]={//音符,時值,//1M2,3,M1,1,M2,3,M1,1,M2,2,M3,2,M5,2,M3,2,M2,3,M1,1,M2,3,M1,1,M2,1,M3,1,M2,1,M1,1,L5,2,P,2,M2,3,M1,1,M2,3,M1,1,M2,2,M3,2,M5,2,M3,2,M2,3,M3,1,M2,2,M1,1,M2,5,P,4,M2,3,M1,1,M2,3,M1,1,M2,2,M3,2,M5,2,M3,2,M2,3,M3,1,M2,2,M1,1,L6,3,P,2,M3,1,M2,1,M1,1,M2,1,M1,2,P,2,M3,1,M2,1,M1,1,M2,1,M1,2,P,2,M3,1,M2,1,M1,1,M2,1,M1,4,P,6,M1,2,M2,2,M3,2,M1,2,M6,2,M5,1,M6,3,P,1,M1,1,M7,2,M6,1,M7,3,P,2,M7,2,M6,1,M7,3,M3,2,H1,1,H2,1,H1,1,M7,1,M6,2,M5,2,M6,2,M5,1,M6,2,M5,1,M6,1,M5,1,M6,2,M5,1,M2,2,M5,1,M5,1,M3,5,P,4,M1,2,M2,2,M3,2,M1,2,M6,2,M5,1,M6,3,P,1,M1,1,M7,2,M6,1,M7,3,P,2,M7,2,M6,1,M7,3,M3,2,H1,1,H2,1,H1,1,M7,1,M6,2,M5,2,M6,2,H3,4,M5,2,M6,2,H3,3,M5,1,M5,1,M6,11,P,2,H1,2,H2,2,H3,2,H6,1,H5,3,H6,1,H5,3,H6,1,H5,3,H2,1,H3,3,H6,1,H5,3,H6,1,H5,3,H6,1,H5,2,H3,1,H3,3,H2,2,H1,1,M6,2,H1,3,H2,2,H1,1,M6,2,H1,2,H3,6,H2,1,H3,1,H2,2,P,2,H1,2,H2,2,H3,2,H6,1,H5,3,H6,1,H5,3,H6,1,H5,2,P,1,H2,1,H3,2,H6,1,H5,3,H6,1,H5,3,H6,1,H5,2,H3,2,H3,1,H2,2,H1,1,M6,2,H3,2,H2,2,H1,1,M6,3,H1,2,H1,8,M6,1,H3,3,H2,2,H1,1,M6,1,M6,1,H3,2,H2,2,H1,1,M6,3,H1,7,H1,8,P,8,0xFF//終止標志 };unsigned int FreqSelect,MusicSelect;void main() {Timer0Init();while(1){if(Music[MusicSelect]!=0xFF) //如果不是停止標志位{FreqSelect=Music[MusicSelect]; //選擇音符對應的頻率MusicSelect++;Delay(SPEED/4*Music[MusicSelect]); //選擇音符對應的時值MusicSelect++;TR0=0;Delay(5); //音符間短暫停頓TR0=1;}else //如果是停止標志位{TR0=0;while(1);}} }void Timer0_Routine() interrupt 1 {if(FreqTable[FreqSelect]) //如果不是休止符{/*取對應頻率值的重裝載值到定時器*/TL0 = FreqTable[FreqSelect]%256; //設置定時初值TH0 = FreqTable[FreqSelect]/256; //設置定時初值Buzzer=!Buzzer; //翻轉蜂鳴器IO口} }

Timer0.c

#include <REGX52.H>/*** @brief 定時器0初始化* @param無* @retval 無 */ void Timer0Init()//1毫秒@11.0592MHz {TMOD &= 0xF0; //設置定時器模式TMOD |= 0x01; //設置定時器模式TL0 = 0x66; //設置定時初始值TH0 = 0xFC; //設置定時初始值TF0 = 0; //清除TF0標志TR0 = 1; //定時器0開始計時ET0=1; //打開定時器0中斷EA=1; //開總中斷PT0=0; }/*定時器終端模板函數 void Timer0_Routine() interrupt 1 {static unsigned int T0Count;TL0 = 0x66; //設置定時初始值TH0 = 0xFC; //設置定時初始值T0Count++;if(T0Count>=1000){T0Count=0;P2_0=~P2_0;} } */

Timer0.h

#ifndef __TIMER0_H__//防重復定義 #define __TIMER0_H__void Timer0Init();#endif

Delay.c

#include <REGX52.H> void Delay(unsigned int xms) {unsigned char i, j;while(xms--){i = 2;j = 239;do{while (--j);} while (--i);} }

Delay.h

#ifndef __DELAY_H__ #define __DELAY_H__void Delay(unsigned int xms);#endif

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