让蜂鸣器响很简单，给蜂鸣器加一个低电平，这样电流通过，蜂鸣器就会响。
代码很简单，应该很容易懂的！
#include <reg52.h>
sbit beep=P2^3;
void main()
{
int a;
while(1)
{
a=66666;
beep=0;
while(a--);
a=66666;
beep=1;
while(a--);
}
}
0
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