51单片机用定时器中断控制鸣笛程序如下(我是菜鸡写的代码肯定不是最简单的)放在proteus里面仿真的时候也感觉有杂音……
#include<reg51.h>
sbit sound=P1^5;
unsigned int time=0;
void main()
{
while(1)
{
if(time<=2000)
{
EA=1;
ET1=1;
TMOD=0x10;
TH1=(65536-460)/256;
TL1=(65536-460)%256;
TR1=1;
while(time<=2000)
{
if(time%2==0)
sound=1;
if(time%2!=0)
sound=0;
}
}
if(time>2000&&time<3000)
{
EA=1;
ET1=1;
TMOD=0x10;
TH1=(65536-921)/256;
TL1=(65536-921)%256;
TR1=1;
while(time<3000)
{
if(time%2==0)
sound=1;
if(time%2!=0)
sound=0;
}
}
if(time==3000)
time=0;
}
}
void Time1()interrupt 3 using 0
{
if(time<=2000)
{
TH1=(65536-460)/256;
TL1=(65536-460)%256;
}
if(time>2000&&time<3000)
{
TH1=(65536-921)/256;
TL1=(65536-921)%256;
}
time++;
}