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

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

// --- DEFINISI PIN ---
const int pinSensorTanah = A0; 
const int pinSensorLDR = A1;   
const int pinRelay = 8;        
const int pinLED = 13; // TAMBAHAN: Pin LED Indikator

// --- BATAS AMBANG (THRESHOLD) ---
const int batasKering = 600;  // Tanah > 600 = Kering
const int batasGelap = 500;   // LDR > 500 = Redup/Malam

// Variabel Data
int nilaiTanah = 0;
int nilaiCahaya = 0;

void setup() {
  // Setup Mode Pin
  pinMode(pinRelay, OUTPUT);
  pinMode(pinLED, OUTPUT); // Set LED sebagai Output
  pinMode(pinSensorTanah, INPUT);
  pinMode(pinSensorLDR, INPUT);
  
  // Matikan semua di awal
  digitalWrite(pinRelay, LOW);
  digitalWrite(pinLED, LOW);
  
  // Setup LCD
  lcd.init();
  lcd.backlight();
  
  // Intro
  lcd.setCursor(0,0);
  lcd.print("Sistem Siram");
  lcd.setCursor(0,1);
  lcd.print("Auto + LDR + LED");
  delay(2000);
  lcd.clear();
}

void loop() {
  // 1. Baca Sensor
  nilaiTanah = analogRead(pinSensorTanah);
  nilaiCahaya = analogRead(pinSensorLDR);

  // 2. Tampilkan Info di LCD Baris Atas
  lcd.setCursor(0,0);
  lcd.print("T:");
  lcd.print(nilaiTanah);
  lcd.print("  C:");
  lcd.print(nilaiCahaya);
  lcd.print("   "); 

  // 3. LOGIKA KONTROL
  lcd.setCursor(0,1);
  
  // KONDISI MENYIRAM: Tanah Kering (>600) DAN Redup (>500)
  if (nilaiTanah > batasKering && nilaiCahaya > batasGelap) {
    digitalWrite(pinRelay, HIGH); // Nyalakan Motor
    digitalWrite(pinLED, HIGH);   // Nyalakan LED Indikator
    lcd.print("MENYIRAM... (ON)");
  }
  
  // KONDISI TUNDA: Tanah Kering TAPI Masih Terang/Panas
  else if (nilaiTanah > batasKering && nilaiCahaya <= batasGelap) {
    digitalWrite(pinRelay, LOW);  // Motor Mati
    digitalWrite(pinLED, LOW);    // LED Mati
    lcd.print("PANAS! TUNDA... ");
  }
  
  // KONDISI AMAN: Tanah Basah
  else {
    digitalWrite(pinRelay, LOW);  // Motor Mati
    digitalWrite(pinLED, LOW);    // LED Mati
    lcd.print("TANAH BASAH OK  ");
  }
  
  delay(1000); 
}