#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 20, 4);

#define S1 5 //back
#define S2 4 //up
#define S3 2//down
#define S4 15// ok
int menu;
bool latchS1, latchS2, latchS3, latchS4;
void setup() {
  // put your setup code here, to run once:
  lcd.init();         // Initialize the LCD I2C display
  lcd.backlight();    // open the backlight
  pinMode (S2, INPUT);
  pinMode (S3, INPUT);
  pinMode (S4, INPUT);
}

void loop() {
 //tombollll fungsi
  if(digitalRead(S2)==1 && latchS2==0){
    latchS2=1;
  }
  if (digitalRead(S2)==0 && latchS2==1){
    menu=menu+1;
    if (menu>2)menu=0;
    latchS2=0;
  }
  if (digitalRead(S3)==0 && latchS3==0){
  latchS3=1;
  }
  if (digitalRead(S3)==1 && latchS3==1){
   menu=menu-1;
   if (menu<0)menu=2;
   latchS3=0;
  }
  //////////////////////////////


  if (menu==0){
    lcd.setCursor(0,0);
    lcd.print("->Ayam Boiler");
    lcd.setCursor(0,1);
    lcd.print("  Ayam Petelur");
    lcd.setCursor(0,2);
    lcd.print("  Ayam Kampung");
    if (digitalRead(S4)==0 && latchS4 ==0){
      latchS4=1;
      }
      if (digitalRead(S4)==1 && latchS4==1){
        lcd.clear();
        menu=21;
        latchS4=0;
      }
  

  }
  if (menu==1){
    lcd.setCursor(0,0);
    lcd.print("  Ayam Boiler");
    lcd.setCursor(0,1);
    lcd.print("->Ayam Petelur");
    lcd.setCursor(0,2);
    lcd.print("  Ayam Kampung");
  }
  if (menu==2){
    lcd.setCursor(0,0);
    lcd.print("  Ayam Boiler");
    lcd.setCursor(0,1);
    lcd.print("  Ayam Petelur");
    lcd.setCursor(0,2);
    lcd.print("->Ayam Kampung");
  }

  if(menu==21){
    lcd.setCursor(0,0);
    lcd.print("Ayam Boiler");
    if(digitalRead(S1)==1 && latchS1==0){
      latchS1=1;
    }
    if(digitalRead(S1)==0 && latchS1==1){
      menu=0;
      latchS1=0;
    }
  }
}