RFID Tag ID Recognition

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imranahmed

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Please let me know that I build a circuit for displaying RFID tag ID.

The ID is written on card is 0001712436 026,08500.

The circuit is 89c52 uC based,
The card ID is received on LCD(20x2) like, |||0001712436||
The 3 lines on start of code and 2 lines on end of code is displaying.
How to fix this problem?

Please find the attachment, How Hyper terminal display the code please see.
 

Attachments

  • HypTer.PNG
    36.6 KB · Views: 90

Maybe some additional ascii data is appended while transmitting the tag. Just use something like this

Code C - [expand]
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char buff1[20], buff2[20];
 
//buff1[] is used in ISR where RFID data is dumped to it.
 
while(1) {
 
      while(buff1[i]) {
 
              if((buff1[i] >= '0') && (buff1[i] <= '9'))buff2[j++] = buff1[i++];
 
      }
 
      buff2[j] = '\0';
 
      lcdPrint(buff2);
 
 
}
 
Zip and post your complete project files. I will see if there is any better way to modify the code. Does any of the RFID tag contains characters A to Z or a to z ?
 
Code: 
//Program to interface RFID with 8051 microcontroller (AT89C51) #include<reg51.h>
unsigned int data_out,command=0x80,temp;
sfr lcd_data_pin=0xA0; //P2 port
sbit rs=P1^0;        //Register select 
sbit rw=P1^1;        //Read/Write 
sbit en=P1^2;        //Enable pin
unsigned char card_id[12];

void delay(unsigned int count)    //Function to provide delay
{
    int i,j;
     for(i=0;i<count;i++)
     for(j=0;j<1275;j++);
}

void lcd_command(unsigned char comm)   //Lcd command funtion
{
     lcd_data_pin=comm;
     en=1;
     rs=0;
     rw=0;
     delay(1);
     en=0;
}

void lcd_data(unsigned char disp)  //Lcd data function
{
     lcd_data_pin=disp;
     en=1;
     rs=1;
     rw=0;
     delay(1);
     en=0;
}

lcd_string(unsigned char *disp)     //Function to send string 
{
     int x;
     for(x=0;disp[x]!=0;x++)
    {
         lcd_data(disp[x]);
    }
}
void lcd_ini()                  //Function to initialize the LCD
{
    lcd_command(0x38);          
    delay(5);
    lcd_command(0x0F);        
    delay(5);
    lcd_command(0x80);
    delay(5);
} 

void recieve()     //Function to recieve data serialy from RS232 
{
    unsigned char k;
     for(k=0;k<12;k++)
     { 
         while(RI==0); 
          card_id[k]=SBUF;
          RI=0;
    }
}

void main()
{
    int l;
    TMOD=0x20;            //Enable Timer 1
    TH1=0XFD;
    SCON=0x50;
    TR1=1;                // Triggering Timer 1
    lcd_ini();
    lcd_command(0x81);        //Place cursor to second position of first line 
    lcd_string("UNIQUE CARD ID:");
    delay(200);
    while(1)
    {
         recieve();
         lcd_command(0xC1);        //Place cursor to second position of second line
         for(l=0;l<12;l++)
         { 
              lcd_data(card_id[l]);
          }
      }
}

Please see the code.
The ID on card is only 0001712436 026,08500
 

Is it Keil uVision Code ? If yes, Zip and post the complete Keil project.

- - - Updated - - -

Try attached project. RFID baudrate is 9600 bps.

 

Attachments

  • RFID Reader.rar
    135.1 KB · Views: 76
  • rfid 20x2.png
    50.8 KB · Views: 122
Last edited:

Thank you for given project.

I need not only display Tag ID but I am comparing tag ID with tag ID is saved in code.
If ID match the door should be open.
But I am build code for checking that it can receive proper ID or not and not for opening door.

Code is below,
Code: 
// Atmel AT89C52 @ 11.0592MHz
#include<reg52.h>
#include<string.h>
#include<stdio.h> 

sfr lcd_data_pin=0xA0; //P2 port
sbit rs=P3^1;          //Register select 
sbit en=P3^3;          //Enable pin	

unsigned char card_id[12];
unsigned char current_byte=0,flag=0;
unsigned char val1=1;
code const char Student1[]="200017124353";

void delay(unsigned int count)    //Function to provide delay
{
     int i,j;
     for(i=0;i<count;i++)
     for(j=0;j<1275;j++);
}

void lcd_command(unsigned char comm)   //Lcd command funtion
{
     lcd_data_pin=comm;
     en=1;
     rs=0;    
     delay(1);
     en=0;
}

void lcd_data(unsigned char disp)  //Lcd data function
{
     lcd_data_pin=disp;
     en=1;
     rs=1;    
     delay(1);
     en=0;
}

void lcd_string(unsigned char *disp)     //Function to send string 
{
     int x;
     for(x=0;disp[x]!='\0';x++)
    {
         lcd_data(disp[x]);
    }
}
void lcd_init()                       //Function to initialize the LCD
{
    lcd_command(0x38);          
    delay(5);
    lcd_command(0x0F);        
    delay(5);
    lcd_command(0x80);
    delay(5);
} 

/*
void display()                     // Function to display the unique id
{
    unsigned char count;
    lcd_command(0xC1);               //Place cursor to second position of second line
    for(count=0;count<15;count++)
     { 
          lcd_data(card_id[count]);
     }
		 
    current_byte=0;
		 
}
*/


void recieve() interrupt 4           //  Function to recieve data serialy from RS232 
    {
     card_id[current_byte]=SBUF;
     RI=0;                            // Reset the serial interrupt after recieving the byte
     current_byte++;  
     card_id[current_byte]='\0';		
		}


void RFID_routine()
{	
	          
	   
      while(current_byte!=13);
	   
	    val1=strcmp(Student1,card_id);		
			if(val1 == 0)
			{	
      current_byte=0;				
      lcd_command(0x01);        //Clear LCD 
	    lcd_command(0x81);        //Place cursor to second position of first line 
      lcd_string("Condition true");				  
			}
			
			else
			{
			current_byte=0;		
			lcd_command(0x01);        //Clear LCD 
	    lcd_command(0xC1);        //Place cursor to second position of first line 
      lcd_string("Condition false");	 
			}	 
			
}

void main()
{
    
    TMOD=0x20;            //Enable Timer 1
    TH1 =0xFD;
    SCON=0x50;
    TR1 =1;                // Triggering Timer 1
	  EA  =1;
    ES  =1;  
    lcd_init();
    lcd_command(0x01);        //Clear LCD 
	  lcd_command(0x81);        //Place cursor to second position of first line 
    lcd_string("UNIQUE~CARD~ID:");	    
	  delay(10);
    while(1)
    {		
			RFID_routine();                      
	         
	   
		}
}
 

Did you see my code ? In that you only have to add

I have attached my project which is working.

Code C - [expand]
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const char tag[] = "200017124353";
 
while(1) {
 
         if(index >= 20) {
                 parseRFID(card_id, text);
                 if(strcmp(tag, text) == 0) {
                         LCD_Out(2,1,"Access Granted...");
                 }
                 else {
                      LCD_Out(2,1,"Access Denied...");
                 }
                 
                 index = 0;
                 memset(card_id, '0', 30);
                 memset(text, '0', 25);
           }
}
 

Attachments

  • RFID Reader rev1.rar
    33.3 KB · Views: 72
Last edited:

Dear milan,

Thank you for your co-operation.

I am working on your given project and I will reply you as soon as possible.

Regards,
Imran
 

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