NFC drawer lock

/*********************************
 Code by Pierre CHARLIER (mrstein@hotmail.fr)
 Please remplace the "xxxxxxxxxx" by your tag ID.
 You will need KeyDuino library to use it.
 ***********************************/


#include "KeyDuino.h"
KeyDuino keyDuino;

 #define GACHE 12
 #define LED 13

//definition des clefs
String CLEF1 = "xxxxxxxxxx";
String CLEF2 = "xxxxxxxxxx";
String CLEF3 = "xxxxxxxxxx";



//*******************Tag READ fonction
String fct_lecture() {
  String Received;
  boolean success;
  uint8_t IdReceived[] = { 0, 0, 0, 0, 0, 0, 0 };
  uint8_t Id_Length;

  if (success = keyDuino.readPassiveTargetID(PN532_MIFARE_ISO14443A, &IdReceived[0], &Id_Length)) {
    for (uint8_t i = 0; i < Id_Length; i++)
      Received += String(IdReceived[i], HEX);
    Serial.println(Received);
    return (Received);
  }
  else
    return ("NULL");
}




void setup(void) {
  Serial.begin(115200);
  keyDuino.begin();
  pinMode(GACHE, OUTPUT);
  pinMode(LED, OUTPUT);
  digitalWrite(LED, HIGH);
  Serial.println("NFC LOCK");
}



void loop(void) {
  String Received;
  Received = fct_lecture();
  if ((Received == CLEF1 || Received == CLEF2  || Received == CLEF3)) {
    Serial.println("STATE: OPEN");
    digitalWrite(GACHE, HIGH);
    delay(2000);
    Serial.println("STATE: CLOSE");
    digitalWrite(GACHE, LOW);
  }

  else {
    if (Received != 0) {
      Serial.println("Key not found");
keyDuino.buzz(20);
    }
  }
}