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下面是交通燈的電路圖：
下面是交通燈的51單片機程序：
#include<reg51.h>
#define uchar unsigned char
#define uint unsigned int
sbit RED_A=P0^0;
sbit YELLOW_A=P0^1;
sbit GREEN_A=P0^2;
sbit RED_B=P0^3;
sbit YELLOW_B=P0^4;
sbit GREEN_B=P0^5;
uint y;
void DelayMS(uint x)
{
uchar i;
while(x--)for(i=0;i<120;i++);
}
void main()
{
GREEN_A=0;
RED_B=0;
DelayMS(1500);
for(y=0;y<120;y++)
{
GREEN_A=0;
DelayMS(15);
GREEN_A=1;
DelayMS(15);
}
GREEN_A=1;
YELLOW_A=0;
DelayMS(1500);
for(y=0;y<120;y++)
{
YELLOW_A=0;
DelayMS(15);
YELLOW_A=1;
DelayMS(15);
}
YELLOW_A=1;
RED_A=0;
RED_B=1;
GREEN_B=0;
DelayMS(1500);
for(y=0;y<120;y++)
{
GREEN_B=0;
DelayMS(15);
GREEN_B=1;
DelayMS(15);
}
GREEN_B=1;
YELLOW_B=0;
DelayMS(1500);
for(y=0;y<120;y++)
{
YELLOW_B=0;
DelayMS(15);
YELLOW_B=1;
DelayMS(15);
}
YELLOW_B=1;
RED_A=1;
}
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