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

#define DHTPIN 2         // Pin connected to DHT22 data pin
#define DHTTYPE DHT22    // DHT22 (AM2302) sensor type
#define OLED_RESET -1    // Reset pin # (or -1 if sharing Arduino reset pin)

DHT dht(DHTPIN, DHTTYPE);
Adafruit_SSD1306 display(OLED_RESET);

void setup() {
  Serial.begin(9600);
  dht.begin();
  // Initialize OLED display with I2C address 0x3C
  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("SSD1306 allocation failed"));
    for (;;);
  }
  // Clear the buffer
  display.clearDisplay();
}

void loop() {
  // Reading temperature or humidity takes about 250 milliseconds!
  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;
  }

  // Clear previous data on the display
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0,0);
  display.print(F("Temp: "));
  display.print(temperature);
  display.println(F(" C"));
  display.print(F("Humidity: "));
  display.print(humidity);
  display.println(F(" %"));
  display.display();

  delay(2000); // Wait 2 seconds before next reading
}