#include <LCD_I2C.h>

LCD_I2C lcd(0x27, 16, 2); // Default address of most PCF8574 modules, change according

#define PB0 2
#define PB1 3
#define PB2 4
#define PB3 5

#define Potensio1 A0
#define Potensio2 A1
#define Potensio2 A2

int menu;

void setup()
{
  pinMode(PB1, INPUT_PULLUP);
  pinMode(PB2, INPUT_PULLUP);
  pinMode(PB3, INPUT_PULLUP);
  pinMode(PB4, INPUT_PULLUP);

  lcd.begin();
  lcd.backlight();
}

void loop(){
  if (menu==0){
    lcd.setCursor(3,0);
    lcd.print ("TEKAN PB0");
  }
  if (digitalRead(PB0)==0){
    while (digitalRead(PB0)==0){}
    menu=1;
    lcd.clear();
  }
/////////////
  if (menu == 1) {
    lcd.setCursor(0, 0);
    lcd.print (">ADC-A0");
    lcd.setCursor(0, 1);
    lcd.print (" ADC-A1");

  if (digitalRead (PB1) == 0) {
    while  (digitalRead (PB1) == 0) {}
    menu = 2;
    lcd.clear();
    }

  if (digitalRead (PB3) == 0) {
    while  (digitalRead (PB3) == 0) {}
    menu = 0;
    lcd.clear();
    }

  if (digitalRead (PB0) == 0) {
    while  (digitalRead (PB0) == 0) {}
    menu = 4;
    lcd.clear();
    }
  }
/////////////////
  if (menu == 2) {
    lcd.setCursor(0, 0);
    lcd.print (">ADC-A1");
    lcd.setCursor(0, 1);
    lcd.print (" ADC-A2");

  if (digitalRead (PB1) == 0) {
    while  (digitalRead (PB1) == 0) {}
    menu = 3;
    lcd.clear();
    }

if (digitalRead (PB2) == 0) {
    while  (digitalRead (PB2) == 0) {}
    menu = 1;
    lcd.clear();
    }

  if (digitalRead (PB3) == 0) {
      while  (digitalRead (PB3) == 0) {}
    menu = 0;
    lcd.clear();
    }

  if (digitalRead (PB0) == 0) {
    while  (digitalRead (PB0) == 0) {}
    menu = 5;
    lcd.clear();
    }
  }
  ////////////////////
  if (menu == 3) {
    lcd.setCursor(0, 0);
    lcd.print (" ADC-A1");
    lcd.setCursor(0, 1);
    lcd.print (">ADC-A2");

if (digitalRead (PB2) == 0) {
  while  (digitalRead (PB2) == 0) {}
    menu = 2;
    lcd.clear();
    }

  if (digitalRead (PB3) == 0) {
    while  (digitalRead (PB3) == 0) {}
    menu = 0;
    lcd.clear();
    }

  if (digitalRead (PB0) == 0) {
    while  (digitalRead (PB0) == 0) {}
    menu = 6;
    lcd.clear();
    }
  }
/////////////////////
  if (menu == 4) {
    lcd.setCursor(0, 0);
    lcd.print (" nilai ADC-A0");
    lcd.setCursor(5, 1);
    lcd.print (analogRead(A0));
    lcd.print(" ");

  if (digitalRead (PB3) == 0) {
    while  (digitalRead (PB3) == 0) {}
    menu = 1;
    lcd.clear();
    }
  }
////////////////////////
  if (menu == 5) {
    lcd.setCursor(0, 0);
    lcd.print (" nilai ADC-A1");
    lcd.setCursor(5, 1);
    lcd.print (analogRead(A1));
    lcd.print(" ");

  if (digitalRead (PB3) == 0) {
    while  (digitalRead (PB3) == 0) {}
    menu = 2;
    lcd.clear();
    }
  }
/////////////////////////
  if (menu == 6) {
    lcd.setCursor(0, 0);
    lcd.print (" nilai ADC-A2");
    lcd.setCursor(5, 1);
    lcd.print (analogRead(A2));
    lcd.print(" ");

  if (digitalRead (PB3) == 0) {
     while  (digitalRead (PB3) == 0) {}
    menu = 3;
    lcd.clear();
    }
  }
}