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

// Define display parameters
#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);

// Define DHT parameters
#define DHTPIN 2 // For Arduino, use pin 2; for ESP32, adjust accordingly
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

// Define LED pin
#define LED_PIN 13 // Adjust if needed

void setup() {
  pinMode(LED_PIN, OUTPUT);

  // Initialize display with the I2C address
  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Address 0x3C for 128x64
    Serial.println(F("SSD1306 allocation failed"));
    for (;;);
  }
  display.clearDisplay();

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

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

  // Clear display buffer
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0, 0);
  display.print("Temp: ");
  display.print(temperature);
  display.print(" C");
  display.setCursor(0, 10);
  display.print("Humidity: ");
  display.print(humidity);
  display.print(" %");
  display.display();

  // Turn on LED if temperature or humidity exceeds thresholds
  if (temperature > 30 || humidity > 70) {
    digitalWrite(LED_PIN, HIGH);
  } else {
    digitalWrite(LED_PIN, LOW);
  }

  // Wait before next read
  delay(2000);
}