#include <LiquidCrystal.h>
const int rs = 2, en = 3, d4 = 4, d5 = 5, d6 = 6 , d7 = 7;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);

#define sw0 digitalRead (8)
#define sw1 digitalRead (9)
#define sw2 digitalRead (10)
#define sw3 digitalRead (11)
int8_t menu;
bool latchSW0, latchSW1, latchSW2, latchSW3;

void setup() {
  lcd.begin(16, 2);
  pinMode(8, INPUT_PULLUP);
  pinMode(9, INPUT_PULLUP);
  pinMode(10, INPUT_PULLUP);
  pinMode(11, INPUT_PULLUP);
}

void loop() {
  if (menu == 0){
    lcd.setCursor (2,0);
    lcd.print("TEKAN TOMBOL");
    //p&r sw0//  
    if (latchSW0 == 0 && sw0 == 0){
      latchSW0 = 1;
    }
    if (latchSW0 == 1 && sw0 == 1){
      lcd.clear();
      menu=1;
      latchSW0=0;
    }
  }

  if (menu == 1){
    lcd.setCursor (0,0);
    lcd.print(">NILAI - A0");
    lcd.setCursor (0,1);
    lcd.print(" NILAI - A1");

    if (latchSW3 == 0 && sw3 == 0){
      latchSW3 = 1;
    }
    if (latchSW3 == 1 && sw3 == 1){
      lcd.clear();
      menu=0;
      latchSW3=0;
    }
    if (latchSW0 == 0 && sw0 == 0){
      latchSW0 = 1;
    }
    if (latchSW0 == 1 && sw0 == 1){
      lcd.clear ();
      menu=3;
      latchSW0=0;
    }
    if (latchSW1 == 0 && sw1 == 0){
      latchSW1 = 1;
    }
    if (latchSW1 == 1 && sw1 == 0){
      lcd.clear ();
      menu=2;
      latchSW1 = 0;
    }
  }

  if (menu == 2){
    lcd.setCursor (0,0);
    lcd.print(" NILAI - A0");
    lcd.setCursor (0,1);
    lcd.print(">NILAI - A1");

    if (latchSW2 == 0 && sw2 == 0){
      latchSW2 = 1;
    }
    if (latchSW2 == 1 && sw2 == 1){
      lcd.clear();
      menu=1;
      latchSW2=0;
    }
    if (latchSW0 == 0 && sw0 == 0){
      latchSW0 = 1;
    }
    if (latchSW0 == 1 && sw0 == 1){
      lcd.clear ();
      menu=4;
      latchSW0=0;
    }
    if (latchSW3 == 0 && sw3 == 0){
      latchSW3 = 1;
    }
    if (latchSW3 == 1 && sw3 == 1){
      lcd.clear ();
      menu = 0;
      latchSW3=0;
    }
  }

  if (menu == 3){
    lcd.setCursor (0,0);
    lcd.print ("ADC - A0= ");
    lcd.print (analogRead(A0));
    lcd.print(" ");
    if (latchSW3 == 0 && sw3 == 0){
      latchSW3 = 1;
    }
    if (latchSW3 == 1 && sw3 == 1){
      lcd.clear ();
      menu = 1;
      latchSW3=0;
    }
  }

  if (menu == 4){
    lcd.setCursor (0,0);
    lcd.print ("ADC - A1= ");
    lcd.print (analogRead(A1));
    lcd.print (" ");
    if (latchSW3 == 0 && sw3 == 0){
      latchSW3 = 1;
    }
    if (latchSW3 == 1 && sw3 == 1){
      lcd.clear ();
      menu = 2;
      latchSW3=0;
    }
  }

}