EM-18 rfid reader module with pic microcontroller

[Sajo Joseph]

how to interface em-18 rfid reader module with pic 16f877a microcontroller ?

 

[Harald Kapp]

Welcome to our forum.

The datasheet is not worth its name. I guess by connecting pin 6 to High you activate RS232 mode and can then read data from pin 7 via UART protocol (5V logic level, not true RS232 level!) This setup is shown here.

 

[ligo.george]

Circuit Diagram :

MikroC Code :

// LCD module connections
sbit LCD_RS at RB2_bit;
sbit LCD_EN at RB3_bit;
sbit LCD_D4 at RB4_bit;
sbit LCD_D5 at RB5_bit;
sbit LCD_D6 at RB6_bit;
sbit LCD_D7 at RB7_bit;

sbit LCD_RS_Direction at TRISB2_bit;
sbit LCD_EN_Direction at TRISB3_bit;
sbit LCD_D4_Direction at TRISB4_bit;
sbit LCD_D5_Direction at TRISB5_bit;
sbit LCD_D6_Direction at TRISB6_bit;
sbit LCD_D7_Direction at TRISB7_bit;
// End LCD module connections

void main()
{
char i, rfid[13];
Lcd_Init(); // Initialize LCD
Lcd_Cmd(_LCD_CLEAR); // Clear display
Lcd_Cmd(_LCD_CURSOR_OFF); // Cursor off
Lcd_Out(1,1,"RFID Tag Reader"); // Write text in first row

UART1_Init(9600); // Initialize UART, 9600 baud rate

rfid[12] = ''; // String Terminating Character

while(1) // Infinite Loop
{
if(UART1_Data_Ready()) // If UART Data Ready
{
for(i=0;i<12;) // To Read 12 characters
{
if(UART1_Data_Ready())
{
rfid[i] = UART1_Read();
i++;
}
}
// Check For Errors
if((rfid[0] ^ rfid[2] ^ rfid[4] ^ rfid[6] ^ rfid[8] == rfid[10]) && (rfid[1] ^ rfid[3] ^ rfid[5] ^ rfid[7] ^ rfid[9] == rfid[11]))
{
Lcd_Out(2,1,rfid);
}
else
{
Lcd_Out(2,1,"Error ");
}
}
}

Source :
Interfacing EM-18 RFID Reader Module with PIC Microcontroller

 

[kumarmanoj0129]

You may found EM-18 datasheet at

http://www.nrdcentre.com/image/data/RFID/EM-18 Datasheett.jpg