主板蜂鸣器怎么接

主板蜂鸣器连接的方法：

1、先找到主机箱上的SPEAKER连接线。

2、再找到主板上对应的接口+SPEAK-，红线是正极。对应针脚插入即可。

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，广泛应用于计算机、打印机、复印机、报警器、电子玩具、汽车电子设备、电话机、定时器等电子产品中作发声器件。蜂鸣器主要分为压电式蜂鸣器和电磁式蜂鸣器两种类型。蜂鸣器在电路中用字母“H”或“HA”（旧标准用“FM”、“ZZG”、“LB”、“JD”等）表示。

电脑机箱主板，又叫主机板（mainboard）、系统板（systemboard）或母板（motherboard）；它分为商用主板和工业主板两种。它安装在机箱内，是微机最基本的也是最重要的部件之一。主板一般为矩形电路板，上面安装了组成计算机的主要电路系统，一般有BIOS芯片、I/O控制芯片、键和面板控制开关接口、指示灯插接件、扩充插槽、主板及插卡的直流电源供电接插件等元件。

/
程序名称：音乐演奏器
简要说明：P10口输出各音调的频率方波

编 写： MMC
更新时间：09\05
/
#include
#define SPK P0_0 //定义方波输出口
#define LED P1_1
#define shumaguan P0 //定义数码管段码输出
unsigned int tone1,tone2;
/标准音符表/
//用于使定时器初值变化以产生相应频率的定时
unsigned char code yinfu[]={
0xfb,0xe9, //Do
0xfc,0x5c, //Re
0xfc,0xc1, //Mi
0xfc,0xef, //Fa
0xfd,0x45, //So
0xfd,0x92, //La
0xfd,0xd0, //Si
0xfd,0xee, //Do#
0xfa,0x14, //So低
0xfa,0xb9, //La低
0xfb,0x4d, //Si低
0x00,0x00 //音符之间的间隔，只要间隔时间小于65ms时，
//喇叭不会发出声音，用作拍子之间的短暂停顿
};

/军港之夜音调表/
unsigned char code shengri_tone[]={9,3,3,1,2,3,2,3,3,10,9,1,2,1,3,5,5,3,6,5,3,
3,3,2,1,2,3,2,3,11,9,10,11,10,1,11,3,3,11,10,11,10,11,3,3,11,
11,10,11,10,2,10,1,11,10,9,10,9,3,5,5,3,6,5,6,5,3,5,3,1,3,3,3,5,
3,5,5,3,3,2,3,2,11,10,11,10,9,3,3,5,5,3,6,5,6,5,3,5,3,1,3,
3,5,3,5,5,3,3,3,2,3,2,11,10,11,10,9,1 //0代表不发声，即停顿；数字即为音调
};

/军港之夜节拍表/
unsigned char code shengri_beat[]={24,24,24,24,12,12,48,24,48,24,24,12,12,86,24,24,24,24,24,48,24,
48,12,12,24,12,12,86,48,24,24,12,12,48,24,24,24,24,24,12,12,72,24,24,24,24,
24,12,12,48,24,12,12,24,24,12,12,86,24,24,24,24,24,12,12,48,12,24,12,24,12,12,12,48,
24,24,24,24,24,12,12,48,24,12,12,24,24,86,24,24,24,24,24,12,12,48,12,24,12,24,24,
24,72,24,24,24,12,12,24,12,12,48,24,12,12,24,24,86 //节拍，即tone表各音调的延时
};

/自动演示音调表/
unsigned char code yanshi_tone[]={ 1,0,2,0,3,0,4,0,5,0,6,0,7,0,8,0,
8,0,7,0,6,0,5,0,4,0,3,0,2,0,1,0
};

/自动演示节拍表/
unsigned char code yanshi_beat[]={ 48,1,48,1,48,1,48,1,48,1,48,1,48,1,48,2,
48,1,48,1,48,1,48,1,48,1,48,1,48,1,48,2

};

/15ms延时子程序，用于节拍/
void delay(void)
{
unsigned char n=15;
while(n--)
{
unsigned char i;
for(i=0;i<125;i++);
}
}

/定时器0初始化/
void initTimer(void)
{
TMOD=0x01; //定时器0，工作方式1;定时器1，工作方式1
TH0=tone1;
TL0=tone2;
}

/定时器0中断服务程序/
void timer0(void) interrupt 1
{
TH0=tone1;
TL0=tone2;
SPK=~SPK; //取反，以产生方波
}

/演奏子程序1/
void play1(void)
{
unsigned char m=0;
unsigned char s;
unsigned char a=1;
while(1)
{
EA=0;
LED=0;
a=shengri_tone[m]; //取音符
s=shengri_beat[m]; //取节拍
tone1=yinfu[2a-2];
tone2=yinfu[2a-1];
EA=1;
while(s--)
{
delay();
}
LED=1;
m++;
if(m>=119) return; //数值是shengri相关表中的元素数量
}
}

/演奏子程序2/
void play2(void)
{
unsigned char m=0;
unsigned char s;
unsigned char a=1;
while(1)
{
EA=0;
LED=0;
a=yanshi_tone[m];
s=yanshi_beat[m];
tone1=yinfu[2a-2];
tone2=yinfu[2a-1];
EA=1;
while(s--)
{
delay();
}
LED=1;
m++;
if(m>=32) return;
}
}
/按键检测/
void check_key(void)
{
P2=0xff;
P3=0xff; //设置为输入状态
switch(P2) //检测按键，输出数码管、载入定时器初值、允许中断
{
case 0xfe:shumaguan=0xF9;tone1=0xfb;tone2=0x90;EA=1;break;
case 0xfd:shumaguan=0xA4;tone1=0xfc;tone2=0xc;EA=1;break;
case 0xfb:shumaguan=0xB0;tone1=0xfc;tone2=0x7b;EA=1;break;
case 0xf7:shumaguan=0x99;tone1=0xfc;tone2=0xad;EA=1;break;
case 0xef:shumaguan=0x92;tone1=0xfd;tone2=0xa;EA=1;break;
case 0xdf:shumaguan=0x82;tone1=0xfd;tone2=0x5d;EA=1;break;
case 0xbf:shumaguan=0xF8;tone1=0xfd;tone2=0xa7;EA=1;break;
case 0x7f:play1();break;
default: EA=0;SPK=0;shumaguan=0xff;//如果没有键按下则关闭中断和数码管
}
switch(P3)
{
case 0xfe:shumaguan=0x79;tone1=0xfd;tone2=0xc8;EA=1;break;
case 0xfd:shumaguan=0x24;tone1=0xfe;tone2=0x6;EA=1;break;
case 0xfb:shumaguan=0x30;tone1=0xfe;tone2=0x3e;EA=1;break;
case 0xf7:shumaguan=0x19;tone1=0xfe;tone2=0x57;EA=1;break;
case 0xef:shumaguan=0x12;tone1=0xfe;tone2=0x85;EA=1;break;
case 0xdf:shumaguan=0x02;tone1=0xfe;tone2=0xaf;EA=1;break;
case 0xbf:shumaguan=0x78;tone1=0xfe;tone2=0xd4;EA=1;break;
case 0x7f:play2();break;
default: EA=0;SPK=0;shumaguan=0xff;//如果没有键按下则关闭中断和数码管
}
}

/主程序/
void main(void)
{
initTimer();
// shumaguan=0xff;
TR0=1;
ET0=1;
SPK=0;
while(1)
{
check_key();
}
}

/END/
这个不仅有你说的功能，还集有了一首《军港之夜》的歌在里面
注：我也是在网上找的，自己修改了一下

---