Rfid to keyboard

Using Arduino Programming Questions
1

Hi all.
I need to get mifare uid to keyboard using Arduini Micro.
I use the rc522 library and I get a good response using Serial.print.
The problem is that I m not able to send data to keyboard emulating it.
This is the code

/*

  • MFRC522 - Library to use ARDUINO RFID MODULE KIT 13.56 MHZ WITH TAGS SPI W AND R BY COOQROBOT.
  • The library file MFRC522.h has a wealth of useful info. Please read it.
  • The functions are documented in MFRC522.cpp.
  • Based on code Dr.Leong ( WWW.B2CQSHOP.COM )
  • Created by Miguel Balboa (circuitito.com), Jan, 2012.
  • Rewritten by Søren Thing Andersen (access.thing.dk), fall of 2013 (Translation to English, refactored, comments, anti collision, cascade levels.)
  • Released into the public domain.
  • Sample program showing how to read data from a PICC using a MFRC522 reader on the Arduino SPI interface.
    *----------------------------------------------------------------------------- empty_skull
  • Aggiunti pin per arduino Mega
  • add pin configuration for arduino mega
  • http://mac86project.altervista.org/
    ----------------------------------------------------------------------------- Nicola Coppola
  • Pin layout should be as follows:
  • Signal Pin Pin Pin
  • Arduino Uno Arduino Mega MFRC522 board
  • Reset 9 5 RST
  • SPI SS 10 53 SDA
  • SPI MOSI 11 52 MOSI
  • SPI MISO 12 51 MISO
  • SPI SCK 13 50 SCK
  • The reader can be found on eBay for around 5 dollars. Search for "mf-rc522" on ebay.com.
    */

#include <SPI.h>
#include <MFRC522.h>

#define SS_PIN 10
#define RST_PIN 5
MFRC522 mfrc522(SS_PIN, RST_PIN); // Create MFRC522 instance.

void setup() {
Serial.begin(115200); // Initialize serial communications with the PC
SPI.begin(); // Init SPI bus
mfrc522.PCD_Init(); // Init MFRC522 card
Keyboard.begin();
}

void loop() {
// Look for new cards
if ( ! mfrc522.PICC_IsNewCardPresent()) {
return;
}

// Select one of the cards
if ( ! mfrc522.PICC_ReadCardSerial()) {

return;
}
for (byte i = 0; i < mfrc522.uid.size; i++) {
Serial.print(mfrc522.uid.uidByte < 0x10 ? " 0" : " ");
_ Keyboard.print((mfrc522.uid.uidByte < 0x10 ? " 0" : " "));_
_ Serial.print(mfrc522.uid.uidByte*, HEX);*
Keyboard.print((mfrc522.uid.uidByte < 0x10 ? " 0" : " "));_

}
Serial.println();

*} *

On pc text i get only spaces. I think its a casting problem, that s true? How can I solve that?
Thanks

2

Try this:

   Serial.print(mfrc522.uid.uidByte < 0x10 ? " 0" : " ");
    Serial.print(mfrc522.uid.uidByte, HEX);
    Keyboard.print((mfrc522.uid.uidByte < 0x10 ? " 0" : " "));
    Keyboard.print((mfrc522.uid.uidByte, HEX);
3

No it gives the error
iso c++ forbids comparaison between pointer and integer

4

Sorry. Your incorrect code tags (should be square brackets, not angle brackets) stripped out the indexing. You wrote:

    Serial.print(mfrc522.uid.uidByte[i] < 0x10 ? " 0" : " ");
    Keyboard.print((mfrc522.uid.uidByte[i] < 0x10 ? " 0" : " "));
    Serial.print(mfrc522.uid.uidByte[i], HEX);
    Keyboard.print((mfrc522.uid.uidByte[i] < 0x10 ? " 0" : " "));

You should have written something like:

    Serial.print(mfrc522.uid.uidByte[i] < 0x10 ? " 0" : " ");
    Serial.print(mfrc522.uid.uidByte[i], HEX);
    Keyboard.print((mfrc522.uid.uidByte[i] < 0x10 ? " 0" : " "));
    Keyboard.print((mfrc522.uid.uidByte[i], HEX);