FDX-B 134.2 kHz RFID reader

[ryanme321]

awesome stuff, thanks!

i ordered a similar module from AliExpress however FDX-B tags end in 03 and HDX end in 07 this can be seen in realterm.
i changed line #41 of @red_car code to add in a check

         if (started) // Ignore anything received until we get a start byte.
    {
      buffer[idx++] = b;

      if (b == 0x07 || b == 0x03) // End byte HDX 0x07 FDX-B 0x03

      {
        if (b == 0x07){Serial.println("HDX TAG");} 
        if (b == 0x03){Serial.println("FDX-B TAG");}

        started = false;