#include <SPI.h>
#include <MFRC522.h>
#include <Servo.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C screen (0x27, 16, 2);
#define SS_PIN 10
#define RST_PIN 9
MFRC522 mfrc522(SS_PIN, RST_PIN);   // Create MFRC522 instance.
Servo Tahm;
 const int  SER  =2;
const int LATCH =3;
const int CLK   =4;

void setup()
{
  screen.begin();
  screen.setBacklight((uint8_t)1);
  Serial.begin(9600);   // Initiate a serial communication
  SPI.begin();      // Initiate  SPI bus
  mfrc522.PCD_Init();   // Initiate MFRC522
  Serial.println("hello");
  Serial.println();
  Tahm.attach (3);
  Tahm.write (100);
  msg();
    pinMode (SER, OUTPUT);
  pinMode (LATCH,OUTPUT);
  pinMode (CLK, OUTPUT);
}
void msg() {
  screen.clear();
  screen.print("  searching");
  screen.setCursor (0,1);
  screen.print ("    for card...");
}
void loop()
{
  // Look for new cards
  if ( ! mfrc522.PICC_IsNewCardPresent())
  {
    return;
  }
  // Select one of the cards
  if ( ! mfrc522.PICC_ReadCardSerial())
  {
    return;
  }
  //Show UID on serial monitor
  Serial.print("UID tag :");
  String content= "";
  byte letter;
  for (byte i = 0; i < mfrc522.uid.size; i++)
  {
     Serial.print(mfrc522.uid.uidByte[i] < 0x10 ? " 0" : " ");
     Serial.print(mfrc522.uid.uidByte[i], HEX);
     content.concat(String(mfrc522.uid.uidByte[i] < 0x10 ? " 0" : " "));
     content.concat(String(mfrc522.uid.uidByte[i], HEX));
  }
  Serial.println();
  Serial.print("Message : ");
  content.toUpperCase();
  if (content.substring(1) == "52 5C B2 10") //change here the UID of the card/cards that you want to give access
  {
 digitalWrite (LATCH, LOW);
  shiftOut (SER,CLK,MSBFIRST, B11111111);
  digitalWrite (LATCH, HIGH);
    screen.clear();
    screen.print ("hello ");
    Tahm.write (0);
    delay (100);
     digitalWrite (LATCH, LOW);
  shiftOut (SER,CLK,MSBFIRST, B00000000);
  digitalWrite (LATCH, HIGH);
  delay(200);
   digitalWrite (LATCH, LOW);
  shiftOut (SER,CLK,MSBFIRST, B11111111);
  digitalWrite (LATCH, HIGH);
  delay (200);
     digitalWrite (LATCH, LOW);
  shiftOut (SER,CLK,MSBFIRST, B00000000);
  digitalWrite (LATCH, HIGH);
    delay (5000);

    Tahm.write (179);
    msg();
  }

 else   {

    screen.clear();
    screen.print (" locked");
    delay(5000);
    msg();
  }
}