rfid_multi_tags_full

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

int nfcreader = 1;
int nfc0 = 6; // SPI PIN for first reader
int nfc1 = 8; // SPI PIN for seconde reader
int nfc2 = 10; // SPI PIN for terceiro reader

MFRC522 mfrc522_0(nfc0, 9);
MFRC522 mfrc522_1(nfc1, 9);
MFRC522 mfrc522_2(nfc2, 9);

void setup() {

 Serial.begin(9600);

 pinMode(nfc0, OUTPUT);
 pinMode(nfc1, OUTPUT);
 pinMode(nfc2, OUTPUT);

 SPI.begin();
 SPI.setBitOrder(MSBFIRST);

 // Init MFRC522 cards
 mfrc522_0.PCD_Init();
 mfrc522_1.PCD_Init();
 mfrc522_2.PCD_Init();

 Serial.println("");
}

void read32bitValue(int value, int ss)
{
 digitalWrite(ss, LOW);
 uint32_t val;
 val = SPI.transfer(0xff); //0xff is a dummy
 val |= (uint32_t)SPI.transfer(0xff) << 8;
 val |= (uint32_t)SPI.transfer(0xff) << 16;
 val |= (uint32_t)SPI.transfer(0xff) << 24;
 digitalWrite(ss, HIGH);
}

// Get the UID of the card being scanned
String getID(MFRC522 card){

 String output = "";

 for (byte i = 0; i < card.uid.size; i++) {
 output += card.uid.uidByte[i] < 0x10 ? "0" : "";
 output += String(card.uid.uidByte[i],HEX);
 }

 return output;
}

void readCard(MFRC522 card,int readerNumber) {

 if ( !card.PICC_IsNewCardPresent()) {
 return;
 }

 if ( !card.PICC_ReadCardSerial()) {
 return;
 }


if (getID(card) == "f3634ce5")

 Serial.println("w");
 //Serial.print("Card "+String(readerNumber)+":");
 //Serial.println(getID(card));
 delay (200);

 if (getID(card) == "e3f531db")

 Serial.println("y");
 //Serial.print("Card "+String(readerNumber)+":");
 //Serial.println(getID(card));
 delay (200);

 if (getID(card) == "530a6dd9")

 Serial.println("k");
 //Serial.print("Card "+String(readerNumber)+":");
 //Serial.println(getID(card));
 delay (200);

 //Serial.print("Card "+String(readerNumber)+":");
 //Serial.println(getID(card));
 //delay (500);
}

void loop() {

do{
 switch (nfcreader)
 {
 case 0:
 read32bitValue(0, nfc0);
 nfcreader++;
 readCard(mfrc522_0,0);
 break;

 case 1:
 read32bitValue(0, nfc1);
 nfcreader++;
 readCard(mfrc522_1,1);
 break;

 case 2:
 read32bitValue(0, nfc2);
 nfcreader++;
 readCard(mfrc522_2,2);
 break;

 default:
 nfcreader = 0;
 break;
 }
}while(true);
}