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

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_RESET -1
#define DHTPIN 15  // Changed to GPIO 15
#define DHTTYPE DHT22  // Sử dụng cảm biến độ ẩm DHT22

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
DHT dht(DHTPIN, DHTTYPE);

void setup() {
  Wire.begin(21, 22);  // SDA = 21, SCL = 22
  Serial.begin(115200);

  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("SSD1306 allocation failed"));
    while (true);
  }

  dht.begin();
  delay(2000);  // Chờ cảm biến độ ẩm

  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(0, 0);
  display.println("DHT22");
  display.display();
}

void loop() {
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();

  if (isnan(temperature) || isnan(humidity)) {
    Serial.println("Failed to read from DHT sensor!");
    display.clearDisplay();
    display.setTextSize(1);
    display.setCursor(0, 0);
    display.println("DHT ERROR");
    display.display();
  } else {
    Serial.println("Temperature: " + String(temperature));
    Serial.println("Humidity: " + String(humidity));
    display.clearDisplay();
    display.setTextSize(1);
    display.setCursor(0, 0);
    display.println("Temp: " + String(temperature) + " C");
    display.setCursor(0, 10);
    display.println("Humid: " + String(humidity) + " %");
    display.display();
  }
  delay(2000);
}