LED Interfacing with 8051 Microcontroller with Circuit Diagram Tutorial

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LED INTERFACING WITH  8051 MICROCONTROLLER:

INTRODUCTION:

LED is a light emitting diode.It is used for lighting purposes in many electronic devices.

8051 Development board:

EXPLANATION:

  • Here on the development board  we can see 8 LEDS meant for interfacing with the 8051 microcontroller family.
  • The steps involved in this project are as follows:-
  1. Compiling source code on Keil using C language.
  2. Programming the microchip using debugger.
  3. Interfacing the chip with LED through 8051 development board.
  4. Creating the schematic capture simulation diagram using Proteus software.
  5. Verifying the simulation and thereby compiling the schematic after verification is done.

VIDEO OF LED TOGGLING:-

SOURCE CODE:

#include<reg51.h>

sbit LED=P1^0;

void toggle(void);

void delay(int a);

int main(void)

{

toggle();

while(1)

{

  LED=0;

  delay(50000);

  LED=1;

  delay(50000);

}

}

void toggle(void)

{

P2=0x00;

}

void delay(int b)

{

int i;

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

}

CIRCUIT WORKING:

  • Here in this circuit I have toggled the second LED (left to right from port 0) by the interfacing the 8051 microcontroller using the PORT 1 of the microcontroller.
  • Initially the Reset pin (9th pin of 8051 chip) is connected to the 5V pin before connecting the 9V Power supply.
  • After 5V passes through circuit then the RESET  pin is connected to ground.
  • A wire connection is given from the P2.0 of port 2 (single bit) to the second LED .
  • The LED starts to glow white.
  • The value of 50,000 USING Keil generates around 1s between on and off time. This is for the crystal oscillator of frequency 11.0592 Mhz.

PROTEUS SCHEMATIC: