RFID Based Security System on 8051.

This project uses Radio Frequency Identification (RFID) based Security system is to allow the access only to authorized persons. RFID card (passive or active) has to be shown in front of the RFID reader, then the access is allowed or denied based on the card ID being valid for the school/ organisation.

This project can be improved using the LM35 temperature sensor in this time of pandemic, where along with the identity, even temperature plays an important factor to let the person in the premises or not.

1) main_prg.c

// RFID BASED SECURITY SYSTEM

#include<reg51.h>

#include"lcd.h"

#include"rfid.h"

#include<stdlib.h>

#include<string.h>

#include<stdio.h>

/*

Few RFID passive cards

EM-18 Card reader

LCD

Motor for door

*/

#define psw1 "1234567" // used actual identification numbers for hardware simulation 12 byte

#define psw2 "abcdefg"

#define psw3 "pqrstuv"

// Motor pins

sbit v=P1^0;

sbit r=P1^1;

void open()

{

v=1;

r=0;

}

void close()

{

v=0;

r=1;

}

void allow(char * name)

{

delay(1000);

lcd_cmd(0X90);

lcd_disp("Welcome ");

lcd_cmd(0X98);

lcd_disp(name);

lcd_disp("!");

lcd_cmd(0XD0);

lcd_disp("Please Step In");

open();

delay(5000);

close();

delay(5000);

}

void main()

{

int i=0,count=0;

char str[8];

v=0,r=0;

rf_init();

lcd_init();

lcd_disp("PLACE CARD");

lcd_cmd(0XC0);

lcd_disp("OVER READER");

for(;psw1[i]!='\0';i++);

while(count<i) str[count++]=rf_rx();

display_str("Input received...");

rf_tx('\n');

rf_tx('\r');

if(strcmp(psw1,str)==0)

{

allow("abc");

}

else if(strcmp(psw2,str)==0)

{

allow("XYZ");

}

else if(strcmp(psw3,str)==0)

{

allow("Mno");

}

else

{

delay(1000);

lcd_cmd(0X90);

lcd_disp("Wrong password");

delay(5000);

}

}

On Hardware

3 cards : Authorized

1 card : Unauthorized

Simulation