#include <SPI.h>
#include <MFRC522.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <Servo.h>
LiquidCrystal_I2C lcd(0x27,16,2);
#define SS_PIN 10
#define RST_PIN 9
MFRC522 mfrc522(SS_PIN, RST_PIN);
Servo myServo;

int *aux;
int card1[4];
int flag = 0;
int led = 13;
int cnt =0;

void setup() {
pinMode(led, OUTPUT);

lcd.init();
lcd.backlight();
SPI.begin();
mfrc522.PCD_Init();
lcd.print(” Hello “);
lcd.setCursor(0,1);
lcd.print(” Put the card “);

myServo.attach(6);
myServo.write(0);
}

void loop() {

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

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

for (byte i = 0; i < mfrc522.uid.size; i++) {
aux[i]= mfrc522.uid.uidByte[i];
}
if(flag == 0)
{
lcd.clear();
lcd.print(” Card UID: “);
lcd.setCursor(0,1);
for (byte i = 0; i < mfrc522.uid.size; i++) {
card1[i] = aux[i];
lcd.print( card1[i], DEC);
lcd.print( ” “);
flag =1;
}
delay(3000);
lcd.clear();
lcd.print(” Hello “);
lcd.setCursor(0,1);
lcd.print(” Put the card “);
}

else{

for (byte i = 0; i < mfrc522.uid.size; i++) {
if(aux[i] == card1[i])
cnt++;
}

if(cnt == mfrc522.uid.size-1)
{
lcd.clear();
lcd.print(” ACCES “);
lcd.setCursor(0,1);
lcd.print(” Opened “);
delay(200);

myServo.write(180);
delay(5000);
myServo.write(0);
}
else
{
lcd.clear();
lcd.print(” Oh “);
lcd.setCursor(0,1);
lcd.print(” Try again “);
delay(2000);
}

}

lcd.clear();
lcd.print(” Hello “);
lcd.setCursor(0,1);
lcd.print(” Put the card “);
cnt=0;
}