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

Servo myServo;
DHT myDHT(7, DHT22);  
LiquidCrystal_I2C lcdScreen(0x27, 16, 2);       

const int soilMoisturePin = A0; // Pin untuk sensor kelembapan tanah
int previousSoilMoisture = 0; // Variabel untuk menyimpan kelembapan tanah sebelumnya

void setup() {
  myServo.attach(9);  
  myServo.write(0);  
  myDHT.begin();
  lcdScreen.init();
  lcdScreen.backlight();
  Serial.begin(9600);
}

void loop() {
  float humidity = myDHT.readHumidity();
  float temperature = myDHT.readTemperature();
  
  // Membaca nilai kelembapan tanah
  int soilMoisture = analogRead(soilMoisturePin);
  Serial.println(soilMoisture);

  if (soilMoisture < 500) {
    Serial.println("Siram tanaman karena kelembaban tanah rendah.");
    irrigatePlant();
  }
  
  // Menghitung perubahan kelembapan tanah per derajat atau per interval waktu
  int soilMoistureChange = soilMoisture - previousSoilMoisture;
  previousSoilMoisture = soilMoisture;

  // Mengatur interval waktu penyiraman berdasarkan suhu
  int wateringInterval = 1000; // Default: 10 detik
  if (temperature > 30) {
    wateringInterval = 1000; // Jika suhu di atas 30 derajat Celsius, disiram setiap 5 detik
  }

  if (humidity >= 0 && temperature >= 0) {
    myServo.write(180);  
    Serial.println("Siram tanaman.");
    lcdScreen.setCursor(0, 0);
    lcdScreen.print("Humidity: ");
    lcdScreen.print(humidity);
    lcdScreen.print(" %");
    lcdScreen.setCursor(0, 1);
    lcdScreen.print("Temperature: ");
    lcdScreen.print(temperature);
    lcdScreen.print(" C");
    delay(1000);  
    myServo.write(0);  
    lcdScreen.clear();
  }


  // Menampilkan perubahan kelembapan tanah per derajat ke Serial Monitor
  Serial.print("Soil Moisture Change: ");
  Serial.println(soilMoistureChange);

  // Delay sesuai dengan interval waktu penyiraman
  delay(wateringInterval);  
}

void irrigatePlant() {
  myServo.write(180);  
  Serial.println("Siram tanaman.");
  delay(1000);  
  myServo.write(0);  
}