FDX-B 134.2 kHz RFID reader

Other Hardware General Electronics
80

thanks! appreciate the help and i found this library that makes the change super simple

// A test byte buffer as provided by the user manual of the WL-134A reader
byte buffer[30] = {0x02, 0x31, 0x37, 0x31, 0x41, 0x39, 0x32, 0x35, 0x33, 0x41, 0x33, 0x34, 0x38, 0x33, 0x30, 0x30, 0x31, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x07, 0xf8, 0x03};

byte b;
uint8_t idx;
boolean started = false;

#include <Int64String.h>

byte     XOR;
byte     inverted;

uint64_t   value;


void setup() {
  // Initialize serial communication at 9600 baud
  Serial.begin(9600);
  delay(5000);
  Serial.println("start:");
}

void loop() {
  
        // Print the contents of the buffer to Serial Monitor for verification
        for (int i = 0; i < sizeof(buffer); i++) {
          Serial.print(buffer[i], HEX);
          Serial.print(" ");
        }
        Serial.println();

        // Check we received the message ok.  XOR checksum on bytes 01-26 should match byte 27.
        XOR = buffer[1];
        for (int x = 2; x <= 26; x++)
        {
          XOR ^= buffer[x];  
        }
        Serial.print("Calculated checksum: ");
        Serial.print(XOR, HEX);

        if (XOR == buffer[27])
          Serial.println(" (Correct)");
        else
          Serial.println(" (Error)");


        // Check the inverted XOR checksum
        inverted = ~XOR;
        Serial.print("Inverted checksum: ");
        Serial.print(inverted, HEX);
        if (inverted == buffer[28])
          Serial.println(" (Correct)");
        else
          Serial.println(" (Error)");

        
        // Extract the card number from bytes 01 (LSB) - 10 (MSB).
        value = 0;
        for (int x = 10; x >= 1; x--)
        {
          if(buffer[x] <= '9')
            value = (value<<4) + buffer[x] - '0';  
          else
            value = (value<<4) + buffer[x] - '7';  
        }
        Serial.print("Card number: ");
        //Serial.println(value);
        Serial.println(int64String(value));


        // Extract the country number from bytes 11 (LSB) - 14 (MSB).
        value = 0;
        for (int x = 14; x >= 11; x--)
        {
          if(buffer[x] <= '9')
            value = (value<<4) + buffer[x] - '0';
          else
            value = (value<<4) + buffer[x] - '7';  
        }
        Serial.print("Country number: ");
        //Serial.println(value);
        Serial.println(int64String(value));


        // Extract the Data Block from byte 15.
        Serial.print("Data block: ");
        Serial.println(buffer[15] - '0');

        
        // Extract the Animal Flag from byte 16.
        Serial.print("Animal flag: ");
        Serial.println(buffer[16] - '0');

        Serial.println("\r");
delay(5000);
}