#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <Keypad.h>
#define pinRelay 2
#define Password_Length 8
char Data[Password_Length];
char Master[Password_Length] = "123A456";
byte data_count = 0, master_count = 0;
bool Pass_is_good;
char customKey;
const byte ROWS = 4;
const byte COLS = 4;
char hexaKeys[ROWS][COLS] = {
{'1', '2', '3', 'A'},
{'4', '5', '6', 'B'},
{'7', '8', '9', 'C'},
{'*', '0', '#', 'D'}
};
byte rowPins[ROWS] = {11, 10, 9, 8};
byte colPins[COLS] = {7, 6, 5, 4};
Keypad customKeypad = Keypad(makeKeymap(hexaKeys), rowPins, colPins, ROWS,COLS);

LiquidCrystal_I2C lcd(0x27, 16,2);

void setup() {
  lcd.begin(16, 2);
  lcd.backlight();
  lcd.clear();
  pinMode(pinRelay, OUTPUT);
}
void loop(){
  char customKey = customKeypad.getKey();
  if (customKey) {
    lcd.print(customKey);
    switch(customKey) {
      case '*':
        digitalWrite(pinRelay, HIGH);
      break;
      case '#':
        digitalWrite(pinRelay, LOW);
      break;
    }
  }
}