C51 single-chip comprehensive simulation experiment 1 simple traffic light system

Purpose:

Master the use of output, delay , LED and digital tube.

Experimental equipment and software:

Computer; Keil , Proteus , MCU Elf.

Experiment content:

Traffic lights are an indispensable and important part of people's lives and are of great significance. Just a few days after getting started with single-chip microcomputer, with the most

Simple control technology can also design simple traffic lights.

Experimental requirements:

1. There are 3 LEDs in each of the east-west and north-south directions, which are red, yellow and green .

2. First the red light for 10s , then the green light for 7s , and finally the yellow light flashes for 3s .

3. Through the BCD digital tube, the countdown of the whole cycle of 20s is displayed .

4. It can only be delayed by software delay , and hardware timer cannot be used.

related information:

1. How to use Keil and Proteus .

2. The output of the microcontroller.

3. LED control.

4. Nixie tube control.

5.delay software delay.

Preliminary knowledge:

1. How to use Keil and Proteus .

2. C language, microcontroller pin output, delay software delay.

Experimental steps:

1. Draw the Proteus circuit diagram, add 51 single-chip microcomputers, LEDs , and digital tubes.

2. Create a new Keil project, write programs, generate Hex , and control traffic lights.

3. Load Hex into the circuit and run it.

 Code display:

#include <reg51.h>
#include <stdio.h>

sbit led1=P2^0;
sbit led2=P2^1;
sbit led3=P2^2;

sbit led4=P2^3;
sbit led5=P2^4;
sbit led6=P2^5;

char led_mod[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};

void delay(int ms)		//ÑÓʱ³ÌÐò
{
	int j,k;
	for(j=0;j<ms;j++)			//ÑÓʱms
	   for(k=0;k<124;k++);		//´óÔ¼1ºÁÃëµÄÑÓʱ
}

void display(int num) {
    P3 = led_mod[num / 10];  // ʮλÊý
    P1 = led_mod[num % 10];  // ¸öλÊý
}


void main(void)
 { 
		int seconds = 20;
    int p,k;
    led1=0;led2=0;led3=0;
	 
		P1=led_mod[7];
		P3=led_mod[7];
	 
		led1=1;led2=1;led3=1;
		led4=1;led5=1;led6=1;//³õʼ»¯	 
	 
   while (1)
	 {
		 seconds = 20;
		 
			for(p=20;p>10;p--)
		 { 
		  led1=1;led2=1;led3=0;
			led4=0;led5=1;led6=1;	//ºìÁÁ
			display(seconds);
			seconds--;
		  delay(1000);
		 }

		 
			for(k=0;k<3;k++)//»ÆÉÁ
		 {
		  led1=1;led2=0;led3=1;
			led4=1;led5=0;led6=1;
			delay(500);
		 
		  led1=1;led2=1;led3=1;
			led4=1;led5=1;led6=1;
			seconds--;	
			display(seconds);
			delay(500);			 
		 }
		 
		 for(p=7;p>1;p--)
		 {
		 	led1=0;led2=1;led3=1;
			led4=1;led5=1;led6=0;//ÂÌÁÁ
		  seconds--;	
			display(seconds);
			delay(1000);			 
		 }
		 
		 
//ÓÒ±ßÒ»ÅŵÆ
			seconds = 20;
		 
			led1=1;led2=1;led3=1;
			led4=1;led5=1;led6=1;//³õʼ»¯
		 
		 
		 
			for(p=20;p>10;p--)
		 { 
		  led1=0;led2=1;led3=1;
			led4=1;led5=1;led6=0;	//ºìÁÁ
			display(seconds);
			seconds--;
		  delay(1000);
		 }
		 
			for(k=0;k<3;k++)//»ÆÉÁ
			 {
				led1=1;led2=0;led3=1;
				led4=1;led5=0;led6=1;
				delay(500);
			 
				led1=1;led2=1;led3=1;
				led4=1;led5=1;led6=1;
				seconds--;	
				display(seconds);				 
				delay(500);		
			 }
		 
		 for(p=7;p>1;p--)
		 {
		 	led1=1;led2=1;led3=0;
			led4=0;led5=1;led6=1;//ÂÌÁÁ
		  seconds--;	
			display(seconds);
			delay(1000);			 
		 }
		 
		 
	 }
 }