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

#define RST_PIN        9
#define SS_PIN         10

MFRC522 mfrc522(S_PIN, RST_PIN);


void setup() {
 Serial.begin(9600);
 while (!Serial);
 SPI.begin();
 mfrc522.PCD_DumpVersionToSerial();
 Serial.println(F("San PICC o see UID, SAK, type, and data blocks..."));
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}

void loop() {
 if ( ! mfrc522.PICC_IsNewCardPresent()) {

return;
 }

 if ( ! mfrc522.PICC_ReadCardSerial()) {
return;
 }

mfrc522.PICC_DumpToSerial(&(mfrc522.uid));

}