#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include "DHT.h"

#define DHTPIN 4        // DATA DHT22
#define DHTTYPE DHT22
#define LED_PIN 2       // LED

#define SDA_PIN 3       // RX
#define SCL_PIN 22      // SCL

DHT dht(DHTPIN, DHTTYPE);
LiquidCrystal_I2C lcd(0x27, 16, 2); // LCD 16x2 I2C

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

  dht.begin();

  // Khởi tạo I2C với SDA = RX, SCL = 22
  Wire.begin(SDA_PIN, SCL_PIN);

  lcd.init();
  lcd.backlight();

  lcd.setCursor(0, 0);
  lcd.print("ESP32 + DHT22");
  lcd.setCursor(0, 1);
  lcd.print("Khoi dong...");
  delay(2000);
  lcd.clear();
}

void loop() {
  float nhietDo = dht.readTemperature();

  if (isnan(nhietDo)) {
    lcd.setCursor(0, 0);
    lcd.print("Loi DHT22     ");
    delay(1000);
    return;
  }

  // Hiển thị nhiệt độ
  lcd.setCursor(0, 0);
  lcd.print("Nhiet do:     ");
  lcd.setCursor(10, 0);
  lcd.print(nhietDo, 1);
  lcd.print((char)223);
  lcd.print("C");

  // Điều khiển LED
  if (nhietDo > 37) {
    digitalWrite(LED_PIN, HIGH);
    lcd.setCursor(0, 1);
    lcd.print("LED: BAT      ");
  } else {
    digitalWrite(LED_PIN, LOW);
    lcd.setCursor(0, 1);
    lcd.print("LED: TAT      ");
  }

  delay(2000);
}