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

// Inisialisasi LCD (alamat 0x27, 16 kolom, 2 baris)
LiquidCrystal_I2C lcd(0x27, 16, 2);

const int pinLM35 = A0;
float offset = 0.0; // Kalibrasi 

void setup() {
  Serial.begin(9600);
  lcd.init();
  lcd.backlight();

  // Splash screen
  lcd.setCursor(0, 0);
  lcd.print("Sistem Monitoring");
  lcd.setCursor(0, 1);
  lcd.print("Sensor LM35");
  delay(2000);
  lcd.clear();
}

void loop() {
  // Averaging untuk stabilitas
  int total = 0;
  int samples = 10;

  for (int i = 0; i < samples; i++) {
    total += analogRead(pinLM35);
    delay(10);
  }

  float adcValue = total / (float)samples;

  // Konversi ke suhu
  float celsius = (adcValue * 500.0) / 1023.0 + offset;

  // Serial Monitor
  Serial.print("ADC   : ");
  Serial.print(adcValue, 2);
  Serial.print(" | Suhu: ");
  Serial.print(celsius, 2);
  Serial.println(" C");

  // LCD baris 1
  lcd.setCursor(0, 0);
  lcd.print("Temp: ");
  lcd.print(celsius, 0);
  lcd.print((char)223);
  lcd.print("C   ");

  // LCD baris 2 (logika kondisi)
  lcd.setCursor(0, 1);
  if (celsius < 25.0) {
    lcd.print("Status: DINGIN ");
  } else if (celsius < 35.0) {
    lcd.print("Status: NORMAL ");
  } else {
    lcd.print("Status: PANAS! ");
  }

  delay(500);
}