#include <Servo.h>
#include "DHT.h"

// Pin Definitions
#define DHTPIN 2
#define DHTTYPE DHT22
#define SOIL_SENSOR A0
#define WATER_PUMP 8
#define HEATER 7
#define VENT_SERVO_PIN 9

// Initialize DHT Sensor and Servo Motor
DHT dht(DHTPIN, DHTTYPE);

Servo ventServo;

void setup() {
  // Initialize Serial Monitor
  Serial.begin(9600);

  // Start the DHT sensor
  dht.begin();

  // Pin Modes
  pinMode(SOIL_SENSOR, INPUT);
  pinMode(WATER_PUMP, OUTPUT);
  pinMode(HEATER, OUTPUT);

  // Attach the Servo Motor
  ventServo.attach(VENT_SERVO_PIN);
  ventServo.write(0); // Vent starts closed

  Serial.println("Smart Greenhouse System Initialized");
}

void loop() {
  // Read temperature and humidity from the DHT sensor
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();

  // Read soil moisture from the sensor
  int soilMoisture = analogRead(SOIL_SENSOR);

  // Error check for the DHT sensor
  if (isnan(temperature) || isnan(humidity)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }

  // Display sensor readings on the Serial Monitor
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.println("°C");
  Serial.print("Humidity: ");
  Serial.print(humidity);
  Serial.println("%");
  Serial.print("Soil Moisture: ");
  Serial.println(map(soilMoisture, 0, 1023, 0, 100)); // Convert to percentage

  // *** Actuator Logic ***

  // 1. Temperature Control
  if (temperature > 30) {
    ventServo.write(90); // Open the vent
    Serial.println("Vent opened");
  } else if (temperature < 20) {
    digitalWrite(HEATER, HIGH); // Turn on heater
    Serial.println("Heater ON");
  } else {
    ventServo.write(0); // Close the vent
    digitalWrite(HEATER, LOW); // Turn off heater
    Serial.println("Vent closed, Heater OFF");
  }

  // 2. Soil Moisture Control
  if (soilMoisture < 300) { // Adjust threshold for dry soil
    digitalWrite(WATER_PUMP, HIGH); // Activate water pump
    Serial.println("Water Pump ON");
    delay(10000); // Keep the pump running for 10 seconds
    digitalWrite(WATER_PUMP, LOW); // Turn off the pump
    Serial.println("Water Pump OFF");
  }

  // 3. Humidity Alert
  if (humidity < 50) {
    Serial.println("Warning: Humidity too low!");
  }

  // Delay before the next loop iteration
  delay(5000);
}