#include <Keypad.h>
#include <Servo.h>

const uint8_t ROWS = 4;
const uint8_t COLS = 4;
const int openAngle  = 90;          // door open angle
const int closeAngle = 0;
int incorrect_attempts=0;
char password[4]={'1','9','8','2'};
int flag=0;
char keys[ROWS][COLS] = {
  { '1', '2', '3', 'A' },
  { '4', '5', '6', 'B' },
  { '7', '8', '9', 'C' },
  { '*', '0', '#', 'D' }
};

uint8_t colPins[COLS] = { 5, 4, 3, 2 }; // Pins connected to C1, C2, C3, C4
uint8_t rowPins[ROWS] = { 9, 8, 7, 6 }; // Pins connected to R1, R2, R3, R4

Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);
Servo lockServo;

void setup() {
  // put your setup code here, to run once:
pinMode(10, OUTPUT);
lockServo.attach(11);
lockServo.write(closeAngle); 
Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  // 
  // delay(1000); // Wait for 1000 millisecond(s)
  // digitalWrite(10, LOW);
  // delay(1000); // Wait for 1000 millisecond(s)
  char typed[4];
  for(int i=0;i<4;++i){
  char key = keypad.waitForKey();
  delay(1000);
  typed[i]=key;
  if (key != NO_KEY) {
    Serial.print(key);
  }
  }
  Serial.println();
  for(int i=0;i<4;++i){
    if(typed[i]!=password[i]){
      Serial.println("ACCESS DENIED");
      incorrect_attempts++;
      flag=1;
      break;
    }
  }
  if(incorrect_attempts>=3){
    Serial.println("LOCKOUT TRY AGAIN AFTER 5 SECONDS");
    incorrect_attempts=0;
    digitalWrite(10, HIGH);
    delay(5000);
    Serial.println("RETYPE PASSWORD");
  }
  if(flag==0){
  Serial.println("ACCESS GRANTED");
  lockServo.write(90);
  delay(3000);
  lockServo.write(0);
  digitalWrite(10, LOW);
  }
  flag=0;

}