#include <LiquidCrystal_I2C.h> //librari lcd i2c
#include <Keypad.h>
//kalau masih tdk tampil, ganti menjadi 0x3f(alamat i2c)
LiquidCrystal_I2C lcd(0x27,16,2); 

const byte baris=4;
const byte kolom=4;
const int ledKedip=10;
char keys[baris][kolom]={
  {'1','2','3','A'},
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'*','0','#','D'}
};
byte pinKolom[kolom]={5,4,3,2};
byte pinBaris[baris]={9,8,7,6};
Keypad customKeypad=Keypad(makeKeymap(keys),pinBaris,pinKolom,baris,kolom);

char stringAngka[17];
int indexKeypad = 0;

void setup() {
  // put your setup code here, to run once:
  lcd.init();
  //lcd.begin(20,4);
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.println("Welcome to LCD");
  lcd.setCursor(0, 1);
  lcd.println("Input keypad");
  delay(1000);
  lcd.clear();
  pinMode(ledKedip, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  lcd.noBacklight(); //off backlight
  lcd.setCursor(0, 0);
  lcd.print("Banyak Kedip: ");
  char customKey = customKeypad.getKey();
 
  if (customKey) {
    //Serial.println(customKey);
    switch (customKey)
    {
      case '0':
      case '1':
      case '2':
      case '3':
      case '4':
      case '5':
      case '6':
      case '7':
      case '8':
      case '9':
        
        stringAngka[indexKeypad++] = customKey;
        
        lcd.setCursor(0, 1);
        lcd.print(customKey);
        break;
      case '*'://reset
        lcd.clear();
        indexKeypad = 0;
        break;
      case '#':
        stringAngka[indexKeypad] = 0;
        //lcd.setCursor(0, 1);
 
        int nilaiAngka = atoi(stringAngka);
        kedip(nilaiAngka);
        lcd.clear();
        indexKeypad = 0;
        break;
    }
  }
  
}
void kedip(int jml){
  for(int i=1;i<=jml;i++){
    lcd.noBacklight(); //off backlight
    lcd.setCursor(8, 1);
    lcd.print("Status: ON ");
    digitalWrite(ledKedip, HIGH);
    delay(500);
    lcd.setCursor(8, 1);
    lcd.print("Status: OF ");
    digitalWrite(ledKedip, LOW);
    delay(500);
  }
}