#include <Keypad.h>
#include <LiquidCrystal_I2C.h>
#include <Servo.h>

LiquidCrystal_I2C LCD(0x27, 16,2);
const byte ROWS = 4, COLS = 4;
const byte rowsPins[ROWS] = {9, 8, 7, 6};
const byte colsPins[COLS] = {5, 4, 3, 2};
char keys[ROWS][COLS] = {
    {'1', '2', '3', 'A'},
    {'4', '5', '6', 'B'},
    {'7', '8', '9', 'C'},
    {'*', '0', '#', 'D'}};
Keypad keypad = Keypad(makeKeymap(keys), rowsPins, colsPins, ROWS, COLS);
String kod = "";
void setup(){
  Serial.begin(9600);
  for (int led= 11; led<14; led++){
  pinMode(led, OUTPUT);
  LCD.init();
  LCD.backlight();
  }
}
void loop(){
  char key = keypad.getKey();
  if(key) {
    kod += key;
    Serial.println(kod);}
    if(kod == "1234") {
      LCD.clear();
      digitalWrite(11, 1);  
      LCD.setCursor(2 , 0);
      LCD.print("to'g'ri");
      delay (500);
    }
    else if(kod =="4321") {
      digitalWrite(11, 0);  
      LCD.setCursor(2 , 0);
      LCD.print("noto'g'ri");
      delay (500);
       }
    else if(kod == "4567") {
      LCD.clear();
      digitalWrite(12,1); 
      LCD.print("to'g'ri");
      delay (500); 
      }
    else if(kod =="7654") {
      digitalWrite(12, 0);  
      LCD.setCursor(2 , 0);
      LCD.print("noto'g'ri");
      delay (500);
       }
    else if (kod == "5678") {
      LCD.clear();
      digitalWrite(13,1);
      LCD.print("to'g'ri");
      delay (500);
      LCD.clear ();  }
    else if(kod =="8765") {
      digitalWrite(13, 0);  
      LCD.setCursor(2 , 0);
      LCD.print("noto'g'ri");
      delay (500);
       }
   if(kod.length() >= 4) kod = "";
  }