#include "DHT.h"

// Define pins for each DHT22 sensor
#define DHTPIN1 4
#define DHTPIN2 5
#define DHTPIN3 6
#define DHTPIN4 7
#define DHTTYPE DHT22

// Initialize each DHT22 sensor
DHT dht1(DHTPIN1, DHTTYPE);
DHT dht2(DHTPIN2, DHTTYPE);
DHT dht3(DHTPIN3, DHTTYPE);
DHT dht4(DHTPIN4, DHTTYPE);

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

Servo myservo;
LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() {
  myservo.attach(9);
  myservo.write(0);
  
  // Begin all DHT sensors
  dht1.begin();
  dht2.begin();
  dht3.begin();
  dht4.begin();
  
  lcd.init();
  lcd.backlight();
  Serial.begin(9600);
}

void loop() {
  // Read humidity from all four sensors
  float humidity1 = dht1.readHumidity();
  float humidity2 = dht2.readHumidity();
  float humidity3 = dht3.readHumidity();
  float humidity4 = dht4.readHumidity();

  // Calculate average humidity, ignoring any NaN readings
  int validReadings = 0;
  float totalHumidity = 0;
  
  if (!isnan(humidity1)) {
    totalHumidity += humidity1;
    validReadings++;
  }
  if (!isnan(humidity2)) {
    totalHumidity += humidity2;
    validReadings++;
  }
  if (!isnan(humidity3)) {
    totalHumidity += humidity3;
    validReadings++;
  }
  if (!isnan(humidity4)) {
    totalHumidity += humidity4;
    validReadings++;
  }

  float avgHumidity = (validReadings > 0) ? (totalHumidity / validReadings) : 0;

  // Read temperature from the first sensor (for simplicity)
  float temperature = dht1.readTemperature();

  // Check if average humidity is below threshold
  if (avgHumidity < 15) {
    myservo.write(90);  // Move servo to watering position
    lcd.setCursor(0, 0);
    lcd.print("Humid: ");
    lcd.print(avgHumidity);
    lcd.print(" %");
    lcd.setCursor(0, 1);
    lcd.print("Suhu: ");
    lcd.print(temperature);
    lcd.print(" C");
    delay(3000);  // Watering duration
    myservo.write(0);  // Return servo to initial position
    lcd.clear();
  }

  // Display average humidity and temperature continuously
  lcd.setCursor(0, 0);
  lcd.print("Humid: ");
  lcd.print(avgHumidity);
  lcd.print("%");
  lcd.setCursor(0, 1);
  lcd.print("Temp=");
  lcd.print(temperature);
  lcd.print("C");
  delay(1000);
  lcd.clear();
}