電路原理圖如下：
單片機源程序如下:
#include <reg51.h>
#include <stdio.h>
sbit LED0 = P2^0;
sbit LED1 = P2^1;
sbit LED2 = P2^2;
sbit LED3 = P2^3;
sbit KEY0 = P3^0;
sbit KEY1 = P3^1;
sbit KEY2 = P3^2;
sbit KEY3 = P3^3;
static unsigned char cnt0 = 0,cnt1 = 0,cnt2 = 0,cnt3 = 0;
static unsigned char cnn0 = 1,cnn1 = 1,cnn2 = 1,cnn3 = 1;
void main()
{
bit backup0 = 1;
bit backup1 = 1;
bit backup2 = 1;
bit backup3 = 1;
static unsigned char cnt0 = 0,cnt1 = 0,cnt2 = 0,cnt3 = 0;
static unsigned char cnn0 = 0,cnn1 = 0,cnn2 = 0,cnn3 = 0;
P2 = 0x00;
while(1)
{
if(KEY0 != backup0)
{
if(backup0 == 0)
{
cnt0++;
if(cnt0 >= 10)
{
cnt0 = 0;
}
cnn0++;
LED0 = cnn0%2;
}
backup0 = KEY0;
}
if(KEY1 != backup1)
{
if(backup1 == 0)
{
cnt1++;
if(cnt1 >= 10)
{
cnt1 = 0;
}
cnn1++;
LED1 = cnn1%2;
}
backup1 = KEY1;
}
if(KEY2 != backup2)
{
if(backup2 == 0)
{
cnt2++;
if(cnt2 >= 10)
{
cnt2 = 0;
}
cnn2++;
LED2 = cnn2%2;
}
backup2 = KEY2;
}
if(KEY3 != backup3)
{
if(backup3 == 0)
{
cnt3++;
if(cnt3 >= 10)
{
cnt3 = 0;
}
cnn3++;
LED3 = cnn3%2;
}
backup3 = KEY3;
}
}
}
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