#include <DHT.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h> 
#include <Servo.h>
#include <Adafruit_GFX.h>      
#include <Adafruit_SSD1306.h>  

#define DHTPIN 2         
#define DHTTYPE DHT22
#define SOIL_MOISTURE_PIN A0
#define LIGHT_SENSOR_PIN A1
#define RELAY_PIN 4       
#define SERVO_PIN 3       

DHT dht(DHTPIN, DHTTYPE);
Adafruit_SSD1306 display(128, 64, &Wire, -1);
Servo windowServo;

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

  // Initialize DHT sensor
  dht.begin();

  // Initialize Servo
  windowServo.attach(SERVO_PIN);
  
  // Initialize Relay pin
  pinMode(RELAY_PIN, OUTPUT);
  digitalWrite(RELAY_PIN, LOW); // Start with relay off

  // Initialize OLED display
if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("SSD1306 allocation failed"));
    for (;;);
  }
  display.display();
  delay(2000);
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
}

void loop() {
  // Read temperature and humidity from DHT22
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();

  // Read soil moisture from potentiometer
  int soilMoistureValue = analogRead(SOIL_MOISTURE_PIN);

  // Read light intensity from LDR
  int lightLevel = analogRead(LIGHT_SENSOR_PIN);

  // Control servo based on temperature (simulate window opening/closing)
  if (temperature > 30) {
    windowServo.write(90);  // Open window
  } else {
    windowServo.write(0);   // Close window
  }

  // Control relay for water pump or grow lights based on soil moisture
  if (soilMoistureValue < 300) {
    digitalWrite(RELAY_PIN, HIGH); // Turn on pump
  } else {
    digitalWrite(RELAY_PIN, LOW);  // Turn off pump
  }

  // Display data on OLED
  display.clearDisplay();
  display.setCursor(0, 0);
  display.println(F("Greenhouse Monitoring"));
  display.setCursor(0, 10);
  display.print(F("Temp: "));
  display.print(temperature);
  display.println(" C");

  display.setCursor(0, 20);
  display.print(F("Humidity: "));
  display.print(humidity);
  display.println(" %");

  display.setCursor(0, 30);
  display.print(F("Soil: "));
  display.print(soilMoistureValue);

  display.setCursor(0, 40);
  display.print(F("Light: "));
  display.print(lightLevel);

  display.display();

  delay(2000);  // Update every 2 seconds
}

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