#define LED_Merah 26
#define LED_Hijau 27
#define buzzer 25
#include <Keypad.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,16,2);
const int BARIS = 4;
const int KOLOM = 4;
char keys[BARIS][KOLOM] = {
{'1','2','3','A'},
{'4','5','6','B'},
{'7','8','9','C'},
{'*','0','#','D'}
};
byte rowPins[BARIS] = {14, 12, 19, 18};//connect to the row pinouts of the keypad
byte colPins[KOLOM] = {5, 4, 2, 15};
Keypad customKeypad = Keypad( makeKeymap(keys), rowPins, colPins, BARIS, KOLOM);
char customKey; //Variabel penampung input keypad
int number = 0; //Variabel penampung nilai angka
int password = 262005; //Password
void setup() {
pinMode(LED_Merah,OUTPUT);
pinMode(LED_Hijau, OUTPUT);
pinMode(buzzer, OUTPUT);
// put your setup code here, to run once:
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
delay(1000);
digitalWrite(LED_Hijau, HIGH);
tone(buzzer,1000);
delay(50);
digitalWrite(LED_Hijau, LOW);
noTone(buzzer);
number = 0;
lcd.setCursor(0,1);
lcd.print(" ");
}
else{ //Jika salah, maka
lcd.setCursor(0,1);
lcd.print("Invalid Password"); //Tampilan LCD
digitalWrite(LED_Merah, HIGH);
tone(buzzer,1000);
delay(200);
digitalWrite(LED_Merah, LOW);
noTone(buzzer);
delay(200);
digitalWrite(LED_Merah, HIGH);
tone(buzzer,1000);
delay(200);
digitalWrite(LED_Merah, LOW);
noTone(buzzer);
delay(200);
number = 0;
lcd.setCursor(0,1);
lcd.print(" ");
}
break;
//------------Jika input '*' maka hapus tampilan------------//
case '*':
number = 0;
lcd.setCursor(0,1);
lcd.print(" ");
break;
}
}