#include <Keypad.h> //Library keypad
#include <LiquidCrystal_I2C.h> //Library LCD I2C
LiquidCrystal_I2C lcd(0x27,16,2); //Alamat I2C
const byte ROWS = 4; //Jumlah baris keypad
const byte COLS = 4; //Jumlah kolom keypad
char Keys[ROWS][COLS] = { //Membuat array keypad
{'1','2','3','A'},
{'4','5','6','B'},
{'7','8','9','C'},
{'*','0','#','D'}
};
byte rowPins[ROWS] = { 19, 18, 5, 4 };
byte colPins[COLS] = { 2, 13, 12, 14 };
Keypad customKeypad = Keypad( makeKeymap(Keys), rowPins, colPins, ROWS, COLS); //Masukkan info keypad pada library
char customKey; //Variabel penampung input keypad
int number = 0; //Variabel penampung nilai angka
int password = 9999; //Password
void setup() {
lcd.init (); //Mulai LCD
lcd.setBacklight(HIGH); //Nyalakan backlight
}
void loop() {
lcd.setCursor(0,0);
lcd.print("Input Password"); //Tampilan pada layar LCD
customKey = customKeypad.getKey(); //Baca input keypad
//------------Prosedur jika input berupa angka------------//
switch(customKey){
case '0' ... '9':
lcd.setCursor(0,1);
number = number * 10 + (customKey - '0');
lcd.print(number);
break;
//------------Jika input '#' maka cek password------------//
case '#':
if(number == password){ //Jika password benar, maka
lcd.setCursor(0,1);
lcd.print("Access Accepted "); //Tampilan LCD
number = 0;
lcd.clear();
}
else{ //Jika salah, maka
lcd.setCursor(0,1);
lcd.print("Invalid Password"); //Tampilan LCD
delay(2000);
number = 0;
lcd.clear();
}
break;
//------------Jika input '*' maka hapus tampilan------------//
case '*':
number = 0;
lcd.clear();
break;
}
}/* Program Kunci Pintu dengan password input Keypad 4x4 dibuat oleh Indobot */