RFID 125KHZ Reader Module

This is a great little RFID Reader Module from Innovations, simillar to the ID models (the difference being no silicone protection on the back). If you need an inexpensive way to get started with RFID, this is a great little module. Just power the module, and it will read any 125KHz RFID card.

EM-18 RFID reader is one of the commonly used RFID reader to read 125KHz tags. It features low cost, low power consumption, small form factor and easy to use. It provides both UART and Wiegand26 output formats. It can be directly interfaced with microcontrollers using UART and with PC using an RS232 converter.

Quick Spec

• Power Supply: 5V
• Frequency: 125kHz
• Compatibility: EM4001 64-bit RFID tag
• Interface: 9600bps TTL and RS232
• Output: Magnetic stripe emulation output
• Reading Distance: 100mm read range
• Pin Pitch: 2.54mm
• Dimensions: 32.2 x 32.2 x 8.5mm
• Net Weight: 10g

Pinout

Wiring Diagram

Sample Code

int count = 0;                                          // count = 0
char input[12];                                         // character array of size 12 
boolean flag = 0;                                       // flag =0
void setup()
{
   Serial.begin(9600);                                  // begin serial port with baud rate 9600bps
}
void loop()
{
   if(Serial.available())
   {
      count = 0;
      while(Serial.available() && count < 12)          // Read 12 characters and store them in input array
      {
         input[count] = Serial.read();
         count++;
         delay(5);
      }
      Serial.print(input);                             // Print RFID tag number 
      
      if((input[0] ^ input[2] ^ input[4] ^ input[6] ^ input[8] == input[10]) &&
         (input[1] ^ input[3] ^ input[5] ^ input[7] ^ input[9] == input[11]))
            Serial.println("No Error");
      else
            Serial.println("Error");      
   }
}

Output

The output consists of 12 character ASCII data, where first 10 bits will be the tag number and last 2 bits will be the XOR result of the tag number which can be used for error correction. For eg : If the RFID tag number is 500097892E, output of EM-18 Reader will be 500097892E60, where 60 is 50 xor 00 xor 97 xor 89 xor 2E.

Shipping List

• 1 x RFID 125KHZ Reader Module