Answer private message @ Tiantian Wx //2022-6-12 C language 51 single chip microcomputer led analog traffic light

name ：LED Simulate traffic lights

 

explain ：

Several seconds after the east-west green light , The yellow light is flashing , flashing 5 Red light after the second time ,

When the red light is on , The north-south direction changes from red light to green light , After a few seconds, the North-South yellow light flashes ,

flashing 5 Red light after the second time , The light is green from east to west , So back and forth .

In this example, the time is set to be short so that the running results can be quickly observed during debugging .

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Code block ：

#include <reg51.h>

#define INT8U unsigned char
#define INT16U unsigned int

sbit RED_A = P0^0; // East west direction indicator light 
sbit YELLOW_A =P0^1;
sbit GREEN_A = P0^2;
sbit RED_B = P0^3; // North south direction indicator light 
sbit YELLOW_B = P0^4;
sbit GREEN_B = P0^5;

// Definition of flicker times and operation type variables 
INT8U Flash_Count = 0, Operation_Type = 1;

//-----------------------------------------
// The time delay function 
//-----------------------------------------
void delay_ms(INT16U x)
{
    
	INT8U t;
	while(x--)
		for(t=0; t<120; t++);
}

//-----------------------------------------
// Traffic light switching subroutine 
//-----------------------------------------
void Traffic_Light()
{
    
	switch(Operation_Type)
	{
    
	case 1: // The east-west green light and the South-North red light are on 
		RED_A=1; YELLOW_A=1; GREEN_A=0; 
		RED_B=0, YELLOW_B=1; GREEN_B=1;
		delay_ms(5000);
		Operation_Type=2;
		break;
	case 2: // The yellow light in the east-west direction began to flash , The green light is off 
		for(; Flash_Count<6; Flash_Count++)
		{
    
			RED_A=1; YELLOW_A=~YELLOW_A; GREEN_A=1;
			delay_ms(300);
		}
		Flash_Count=0;
		Operation_Type=3;
		break;
	case 3: // East West red light and South North green light 
		RED_A=0; YELLOW_A=1; GREEN_A=1;
		RED_B=1; YELLOW_B=1; GREEN_B=0;
		delay_ms(5000);
		Operation_Type=4;
		break;
	case 4: // North South Yellow light starts flashing 
		for(; Flash_Count<6; Flash_Count++)
		{
    
			RED_B=1; YELLOW_B=~YELLOW_B; GREEN_B=1;
			delay_ms(300);
		}
		Operation_Type=1;
		break;
	}
}

//------------------------------------------
// The main program 
//------------------------------------------
void main()
{
    
	while(1){
    
		Traffic_Light();
	}
}