#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <ESP32Servo.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);

Servo myServo;

// Pin definisi
const int potPin = 34;        // Potensiometer di GPIO34
const int ledPin = 13;        // LED indikator di GPIO13
const int servoPin = 14;      // Servo di GPIO14
const int buzzerPin = 12;     // Buzzer di GPIO12

void setup() {
  Serial.begin(115200);

  // LCD setup
  lcd.init();
  lcd.backlight();
  lcd.setCursor(1, 0);
  lcd.print("Plant Watering");
  lcd.setCursor(5, 1);
  lcd.print("System");
  delay(2000);
  lcd.clear();

  // Servo, LED, Buzzer Setup
  myServo.attach(servoPin);
  pinMode(ledPin, OUTPUT);
  pinMode(buzzerPin, OUTPUT);
}

void loop() {
  int kelembaban = analogRead(potPin); // 0 - 4095
  int persentase = map(kelembaban, 0, 4095, 0, 100);

  lcd.setCursor(0, 0);
  lcd.print("Moist Level:");
  lcd.print(persentase);
  lcd.print("%   ");

  if (persentase < 40) { // Threshold penyiraman
    lcd.setCursor(0, 1);
    lcd.print("Watering...     ");

    myServo.write(90); // Buka valve

    // LED kedip selama 3 detik (6 kali kedip @500ms)
    for (int i = 0; i < 6; i++) {
      digitalWrite(ledPin, HIGH);
      tone(buzzerPin, 1000);
      delay(250); // nyala 250ms
      digitalWrite(ledPin, LOW);
      noTone(buzzerPin);
      delay(250); // mati 250ms
    }

  } else {
    lcd.setCursor(0, 1);
    lcd.print("Soil Moist OK    ");
    myServo.write(0);
    digitalWrite(ledPin, LOW);
    noTone(buzzerPin); 
  }

  delay(2000);
}