#include "DHT.h" 
#define DHT22Pin 2
#define DHTType DHT22
//OLED
#include  <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

DHT  HT(DHT22Pin, DHTType);
float humidity;
float temperature;

//OLED  define
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT  64 // OLED display height, in pixels
// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

void setup() {
  Serial.begin(9600);
  // For DHT22
  HT.begin();
  // For OLED I2C
  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C))  { // Address 0x3D for 128x64
    Serial.println(F("SSD1306 allocation failed"));
    for(;;);
  }
  display.display(); // Display logo
  delay(1000); 
  display.clearDisplay();
}

void loop() {
  delay(2000);
  
  // Read temperature and humidity from DHT22
  humidity = HT.readHumidity();
  temperature = HT.readTemperature();

  // Display temperature with 'T' at the beginning
  display.clearDisplay();
  display.setTextSize(2);
  display.setTextColor(WHITE);
  display.setCursor(20, 20);
  display.print("T:");
  display.print(temperature, 1);
  display.print("C");
  display.display();
  delay(2000);  // Wait for 2 seconds

  // Display humidity with 'V' at the beginning
  display.clearDisplay();
  display.setTextSize(2);
  display.setTextColor(WHITE);
  display.setCursor(20, 20);
  display.print("V:");
  display.print(humidity, 0);
  display.print("%");
  display.display();
  delay(2000);  // Wait for 2 seconds
}