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

// OLED display width and height, change if using a different model
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_RESET    -1  // Reset pin # (or -1 if sharing Arduino reset pin)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

// DHT22 configuration
#define DHTPIN 2         // Pin connected to the DHT22 data pin
#define DHTTYPE DHT22    // Using DHT22 sensor
DHT dht(DHTPIN, DHTTYPE);

void setup() {
  // Start serial communication
  Serial.begin(9600);
  
  // Initialize the DHT sensor
  dht.begin();

  // Initialize the OLED display
  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {  // 0x3C is the I2C address for the OLED
    Serial.println(F("SSD1306 allocation failed"));
    while (true);  // Don't proceed, loop forever
  }
  
  // Clear the display buffer
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
}

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

  // Check if any reads failed and exit early (to try again)
  if (isnan(humidity) || isnan(temperature)) {
    Serial.println(F("Failed to read from DHT sensor!"));
    return;
  }

  // Print values to Serial for debugging
  Serial.print(F("Humidity: "));
  Serial.print(humidity);
  Serial.print(F("%  Temperature: "));
  Serial.print(temperature);
  Serial.println(F("°C"));

  // Display temperature and humidity on the OLED
  display.clearDisplay();  // Clear the display
  
  display.setCursor(0, 0);  // Set cursor at top-left corner
  display.setTextSize(2);   // Set text size to 2 for larger text
  display.print("Temp: ");
  display.print(temperature);
  display.println(" C");

  display.print("Hum: ");
  display.print(humidity);
  display.println(" %");

  display.display();  // Update the OLED display

  delay(2000);  // Wait 2 seconds between readings
}