#include <Wire.h>
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);

const int tempPin = A0; // Pin sensor suhu
const int button1Pin = 2; // Kembali
const int button2Pin = 3; // Celsius
const int button3Pin = 4; // Fahrenheit

int menuState = 0; // 0: menu utama, 1: suhu Celsius, 2: suhu Fahrenheit
float suhu = 0;

void setup() {
  lcd.begin();
  lcd.backlight();
  pinMode(button1Pin, INPUT_PULLUP);
  pinMode(button2Pin, INPUT_PULLUP);
  pinMode(button3Pin, INPUT_PULLUP);
}

void loop() {
  suhu = analogRead(tempPin) * (5.0 / 1023.0) * 100;

  if (digitalRead(button1Pin) == LOW) {
    menuState = 0;
    delay(300);
  } 
  if (digitalRead(button2Pin) == LOW) {
    menuState = 1;
    delay(300);
  } 
  if (digitalRead(button3Pin) == LOW) {
    menuState = 2;
    delay(300);
  }

  lcd.clear();
  
  if (menuState == 0) {
    lcd.setCursor(0, 0);
    lcd.print("Menu Suhu");
    lcd.setCursor(0, 1);
    lcd.print("1: C  2: F");
  } 
  else if (menuState == 1) {
    lcd.setCursor(0, 0);
    lcd.print("Suhu: ");
    lcd.print(suhu);
    lcd.print(" C");
  } 
  else if (menuState == 2) {
    float fahrenheit = (suhu * 9.0 / 5.0) + 32.0;
    lcd.setCursor(0, 0);
    lcd.print("Suhu: ");
    lcd.print(fahrenheit);
    lcd.print(" F");
  }

  delay(100);
}