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

// Define OLED display size
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64

// Create display object
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

// Define DHT11 sensor
#define DHTPIN 2       // DHT11 data pin connected to Arduino pin 2
#define DHTTYPE DHT11  // DHT sensor type

DHT dht(DHTPIN, DHTTYPE);

void setup() {
  Serial.begin(9600);
  dht.begin();

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

void loop() {
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();

  if (isnan(temperature) || isnan(humidity)) {
    Serial.println(F("Failed to read from DHT sensor!"));
    return;
  }

  Serial.print(F("Temperature: ")); Serial.print(temperature); Serial.print(F("°C "));
  Serial.print(F("Humidity: ")); Serial.print(humidity); Serial.println(F("%"));

  // Display data on OLED
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(WHITE);
  
  display.setCursor(0, 10);
  display.print("Temp: "); display.print(temperature); display.print(" C");
  
  display.setCursor(0, 30);
  display.print("Humidity: "); display.print(humidity); display.print(" %");

  display.display();
  
  delay(2000);  // Refresh every 2 seconds
}