How to Interfacer RFID reader that outputs in HEX

Projects General Guidance
4

strykeroz:
Hi,

HEX is just the way the serial terminal is displaying the output as a human-readable value. It could have shown you a stream of 1's and 0's but that would have even been harder to read for us. To the Arduino this is all the same but it's up to us to define whether the information is treated as numbers, characters, bytes, hex or bitmaps etc.

Do you know what values you were expecting to see with the tags you have?
Geoff

Geoff:

Sorry for the late reply, yes I do know the values I am expecting. I also experimented using another RFID reader. This was anise thing to have since the antenna was printed on the PCB. Unfortunatelly I can't make it work.

I used this code:

/*------------------------------------------------------------------
This is a sample code for RDM630 RFID reader by Spekel(Spekel.se)
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.
http://creativecommons.org/licenses/by-nc-sa/3.0/
-------------------------------------------------------------------*/
#include <SoftwareSerial.h>
#define rxPin 0
#define txPin 1
char code[20];
int val = 0;
int bytesread = 0;
//------------------------------------
//create a Serial object RFID
SoftwareSerial RFID= SoftwareSerial(rxPin, txPin);

void setup()
{
  Serial.begin(9600);
  Serial.println("Serial Ready");
  RFID.begin(9600);
  Serial.println("RFID Ready");
  pinMode(rxPin, INPUT);
  pinMode(txPin, OUTPUT);
}
void loop()
{
  val = 0;
  bytesread = 0;

  while(bytesread < 12)
  {
    // read 12 digit code
    val = RFID.read();
    if(val == 3)
    { // if header or stop bytes before the 10 digit reading
      break; // stop reading
    }

    if(val != 2)
    {
      code[bytesread] = val; // add the digit
      bytesread++; // ready to read next digit
      code[bytesread] = '\0'; // add the NULL
    }
  }

  if(bytesread >= 12)
  { // if 12 digit read is complete
    Serial.print("Tag: [");
     delay(3000);
    for(int i=0; code[i]!='\0' ; i++)
    {
      Serial.print(code[i]);
    }
    Serial.println("]"); //print the whole 13 bytes
  }
  
  delay(3000);
}

I am a bit lost since I am not getting the output from the RFID as expected... I can see the reader module blinks whenever a tag is closer, and connecting it directly to the serial adapter is working.

Any idea?