[SOLVED] Problem in RFID Hardware Connection

[vinothksr08]

Hai friends

am doing door accessing system using RFID. I have problem with hardware connection. i have RFID Reader module that i have attached in image. i don't know how to use that module with microcontroller board. can anyone help me

i can get output when i directly connected with PC Serial port.

than you people....

 

[Jinzpaul4u]

Hello there,

Try these

**broken link removed**

**broken link removed**

**broken link removed**

www.youtube.com/watch?v=t2cGgxchKYY

Best regards,

 

[vinothksr08]

hai jinzpaul

I have completed my coding section. i cant get output in hardware.. i couldn't receive data from RFID module., am sure there is no problem in RFID Module. i think there is a problem in communication between RFID & Microcontroller. i don't know exactly whats the problem. can u explain??

thnaks

 

[Jinzpaul4u]

Hello there,

Try RFID with PC Hyper terminal and MCU with Hyper terminal ..check the output is coming or not?

Update me.

Best regards

- - - Updated - - -

check circuit here

- - - Updated - - -

Check the circuit here

- - - Updated - - -

Check the circuit here

 

[vinothksr08]

yes i checked that. i got output... but i couldn't get in Developement board

 

[Jinzpaul4u]

Please Post your code here,

Which MCU are you using ?? compiler??

Have tried to send a byte of data from hyper terminal to MCU?? check your Hardware connection fully. verify your receiver code with Hyper terminal

Update me

 

[vinothksr08]

i am using at89c51... am sure about my code there is no error in this code... i have checked all my simulation in hyper terminal... but i don't know what to do with that module i attached earlier... please help i attaching my code also

#include<reg51.h>
sbit output=P3^0;
void door_open();
void lcd_command(unsigned char comm);
void lcd_data(unsigned char disp);
unsigned int data_out,command=0x80,temp;
sfr lcd_data_pin=0xA0;
sbit rs=P1^0;
sbit rw=P1^1;
sbit en=P1^2;
unsigned char card_id[12];
unsigned char current_byte = 0;

void delay(unsigned int count)
{
     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)     //Lcd string function 
{
     int x;
     for(x=0;disp[x]!=0;x++)
    {
         lcd_data(disp[x]);
    }
}
void lcd_ini()                  //Function to inisialize 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<12;count++)
     { 
          lcd_data(card_id[count]);
      }
    current_byte=0;
}
void compare()
{
int m;
for(m=0;m<12;m++)
{
if(card_id[m]=='a' && card_id[m+1]=='b' && card_id[m+2]=='c' && card_id[m+3]=='d' && card_id[m+4]=='e' && card_id[m+5]=='f' && card_id[m+6]=='a' && card_id[m+7]=='b' && card_id[m+8]=='c' && card_id[m+9]=='d' && card_id[m+10]=='e' && card_id[m+11]=='f'
|| card_id[m]=='1' && card_id[m+1]=='2' && card_id[m+2]=='3' && card_id[m+3]=='1' && card_id[m+4]=='2' && card_id[m+5]=='3' && card_id[m+6]=='4' && card_id[m+7]=='5' && card_id[m+8]=='6' && card_id[m+9]=='7' && card_id[m+10]=='8' && card_id[m+11]=='9')
{
display();
door_open();
}
}
}
void door_open()
{
lcd_command(0x01);
lcd_command(0x84);
lcd_string("WelcomE");
lcd_command(0xC0);
lcd_string("The door opened");
}
void recieve() interrupt 4     
{
          card_id[current_byte]=SBUF;
          RI=0;                // Reset the serial interrupt after recieving the byte
        current_byte++;    
}
void main()
{
	output=0;	
   TMOD=0x20;                            //Enable Timer 1
   TH1=0XFD;
   SCON=0x50;
  TR1=1;
   EA=1;
   ES=1;                                // Trigger Timer 1
   lcd_ini();
   lcd_command(0x81);                    //Place cursor to second position of first line 
   lcd_string("UNIQUE CARD ID:");
   delay(200);
    while(1)
    {
        while(current_byte!=12);    
     
		compare();
    }
}

thank you..!!!

 

[Jinzpaul4u]

Hello there,

Are you trying this code?? **broken link removed**

i have uploaded the c code for interfacing 8051 and RFID

 

[errakeshpillai]

if(card_id[m]=='a' && card_id[m+1]=='b' && card_id[m+2]=='c' && card_id[m+3]=='d' && card_id[m+4]=='e' && card_id[m+5]=='f' && card_id[m+6]=='a' && card_id[m+7]=='b' && card_id[m+8]=='c' && card_id[m+9]=='d' && card_id[m+10]=='e' && card_id[m+11]=='f'
|| card_id[m]=='1' && card_id[m+1]=='2' && card_id[m+2]=='3' && card_id[m+3]=='1' && card_id[m+4]=='2' && card_id[m+5]=='3' && card_id[m+6]=='4' && card_id[m+7]=='5' && card_id[m+8]=='6' && card_id[m+9]=='7' && card_id[m+10]=='8' && card_id[m+11]=='9')

There is a problem with the condition here. I guess the operator precedence will create a problem for you.
Put both your conditions in parenthesis before you OR them.

if((card_id[m]=='a' && card_id[m+1]=='b' && card_id[m+2]=='c' && card_id[m+3]=='d' && card_id[m+4]=='e' && card_id[m+5]=='f' && card_id[m+6]=='a' && card_id[m+7]=='b' && card_id[m+8]=='c' && card_id[m+9]=='d' && card_id[m+10]=='e' && card_id[m+11]=='f')
|| (card_id[m]=='1' && card_id[m+1]=='2' && card_id[m+2]=='3' && card_id[m+3]=='1' && card_id[m+4]=='2' && card_id[m+5]=='3' && card_id[m+6]=='4' && card_id[m+7]=='5' && card_id[m+8]=='6' && card_id[m+9]=='7' && card_id[m+10]=='8' && card_id[m+11]=='9'))

I guess it should work.

 

[vinothksr08]

Thank you very much friends especially for Jinzpaul....

i got output in hardware for my same code......

 

[errakeshpillai]

Did you figure out what was the problem...??
You can share it here so that, if in future if someone searches he can get useful guidance.

 

[vinothksr08]

Yaah sure my problem was with my RFID Module... in that module i have to received data from TTL pin & i should connect Male to male DB9 Connector between controller board and RFID Module... till now i didn't do it... now i only i found that

 

[Jinzpaul4u]

Ohh Thats really great dear..

Best regards,