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

// Define pins
#define PIR 2
#define Led 4
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 32 // OLED display height, in pixels
#define OLED_RESET -1    // Reset pin # (or -1 if sharing Arduino reset pin)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

// DHT sensor setup
#define DHTPIN 15
#define DHTTYPE DHT22
DHT Sensor(DHTPIN, DHTTYPE);

void setup() {
Serial.begin(9600);
// initialize OLED display with I2C address 0x3C
if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
Serial.println(F("failed to start SSD1306 OLED"));
while (1);
}
  // Initialize other components
  pinMode(PIR, INPUT);
  pinMode(Led, OUTPUT);
  
  // Initialize DHT sensor
  Sensor.begin();
}

void loop() {
  delay(1000);  // It takes 1000ms to wait for the device to read

  // Read temperature and humidity
  float tempr = Sensor.readTemperature();
  float humid = Sensor.readHumidity();

  // Clear the display before writing new data
  display.clearDisplay();

  // Display temperature
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0, 0);
  display.print("T = ");
  display.print(tempr);
  display.println(" C");

  // Display humidity

  display.print("H = ");
  display.print(humid);
  display.println(" %");

  if (digitalRead(PIR))
  display.println("Occupied");
  else
  display.println("Free");

  // Update the display with new data
  display.display();
}