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

#define SCREEN_WIDTH 128 
#define SCREEN_HEIGHT 64 

#define DHT_PIN 19        // Pin where your DHT22 is connected (change if needed)
#define DHT_TYPE DHT22    // Define the sensor type (DHT22)

// Initialize the DHT sensor
DHT dht(DHT_PIN, DHT_TYPE);

// Create an OLED display object connected to I2C
Adafruit_SSD1306 oled(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

void setup() 
{
  Serial.begin(115200); // Initialize serial communication at a higher baud rate

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

  // Initialize OLED display with I2C address 0x3C
  if (!oled.begin(SSD1306_SWITCHCAPVCC, 0x3C))
   {
    Serial.println(F("Failed to start SSD1306 OLED"));
    while (1); // Infinite loop to halt execution
  }

  delay(2000);         // Wait two seconds for initializing
  oled.clearDisplay(); // Clear display
}

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

  // Check if the data was successfully read from the sensor
  if (!isnan(temperature) && !isnan(humidity)) {
    // Clear the display
    oled.clearDisplay();

    // Display temperature and humidity on OLED
    oled.setTextSize(1);         // Set text size
    oled.setTextColor(WHITE);    // Set text color
    oled.setCursor(21, 0);       // Set position to display (x, y)
    oled.print("Weather Station");
    
    oled.setCursor(0, 20);       // Set position to display (x, y)
    oled.print("Temperature: ");
    oled.setCursor(100, 20);
    oled.print(temperature);
    oled.print(" C");

    oled.setCursor(0, 45);       // Set position to display (x, y)
    oled.print("Humidity: ");
    oled.setCursor(100, 45);
    oled.print(humidity);
    oled.print(" %");

    // Draw lines for separation
    oled.drawLine(0, 15, 128, 15, WHITE); // Horizontal line
    oled.drawLine(0, 35, 128, 35, WHITE); // Horizontal line
    oled.drawLine(70, 16, 70, 64, WHITE); // Vertical line

    oled.display(); // Update OLED display

    // Print temperature and humidity values to the serial monitor
    Serial.print("Temperature (°C): ");
    Serial.println(temperature);
    Serial.print("Humidity (%): ");
    Serial.println(humidity);
  } else {
    // If there was an error reading data from the sensor, print an error message
    Serial.println("Error reading from DHT sensor");
  }

  // Delay for a few seconds before taking the next reading
  delay(2000);
}