Electronics_Guru: Led chaser using 8051

Hi friends. Now I am going to show the basic “Embedded C” programming for “LED CHASER using 8051”. I am using ‘ KEIL ’ Software for compiling Embedded C program and, for Hardware simulation I am using ‘ PROTEUS ’ Software.

Software programming:-

This is the basic program for LED chaser using 8051, because as you see this program is very large that’s why it is very basic program for easily understanding the Embedded C programming. Before you seeing this program you may know about keil software. Lets see the program..

#include<reg51.h> // This command is used for including all register file of 8051.

sbit led1=P2^0; // This is used for initializing single bit of P2.0 to led1.

sbit led2=P2^1;

sbit led3=P2^2;

sbit led4=P2^3;

sbit led5=P2^4;

sbit led6=P2^5;

sbit led7=P2^6;

sbit led8=P2^7;

void delay (unsigned int ms) // This loop is used for time taken by each led is ON or OFF.

{

unsigned int i, j;

for (i=0; i<=ms; i++)

for (j=0; j<1275; j++); // Here 1275 indicates 1 millisecond.

}

void main ()

{

led1=0;

led2=0; // Firstly I initialize all leds into OFF state

led3=0; // i.e. led (n) =0;

led4=0; // n: - No. of Leds */

led5=0;

led6=0;

led7=0;

led8=0;

while (1)

{

delay (10); // delay (10) means led 1 is ON by delay 10 milliseconds.

led1=1;

delay (10);

led1=0;

led2=1;

delay (10);

led2=0;

led3=1;

delay (10);

led3=0;

led4=1;

delay (10);

led4=0;

led5=1;

delay (10);

led5=0;

led6=1;

delay (10);

led6=0;

led7=1;

delay (10);

led7=0;

led8=1;

delay (10);

led8=0;

led1=1;

}

You can use Arrays concept on this program then shorten the program. But I make this program for easily understanding to every one.

Hardware implementation:-

You can run this program on 8051 micro-controller by using ‘PROTEUS’ Software. Before you can go this you know about this software like Open New Project, dump ‘.hex ‘file on your controller so on. Lets see the circuit diagram of this project..

In the above circuit Power supply(Vcc=5v) and Ground terminals are not necessary in this software because these terminals are inbuilt in Proteus and there is no need using crystal oscillator for small applications but, you can do large applications on Proteus then you need crystal oscillator for accuracy output. If you need RESET switch then design it in this software. By click on this switch(sw1) then the circuit will go to initial stage directly, instead of ON and OFF the power supply. This 8051 micro-controller give the input voltage is in between 4.5v to 5.5v. For more information about 8051 micro-controller you can see the data-sheet. Now see the circuit design when using crystal oscillator and RESET button in Proteus..