#include <LiquidCrystal_I2C.h>
#include <Wire.h>
#include <DHT.h>
// Initialize LCD at I2C address 0x27 for a 16x2 display
LiquidCrystal_I2C lcd(0x27, 16, 2); // Connection (SCL: 21/GPIO5, SDA: 22/GPIO4)
// Define DHT22 sensor pin and type
#define DHTPIN D1     // Pin where the DHT22 is connected
#define DHTTYPE DHT22 // DHT 22 (AM2302)
DHT dht(DHTPIN, DHTTYPE);
void setup() {
 // Start serial communication for debugging
 Serial.begin(115200);
 // Start the DHT sensor
 dht.begin();
 
 // Initialize I2C with default pins (SDA: GPIO4/D2, SCL: GPIO5/D1)
 Wire.begin(); // Default works for ESP8266; use Wire.begin(SDA, SCL) for custom pins
// Initialize LCD and turn on backlight
 lcd.init();
 lcd.backlight();
// Print static labels on the LCD
 lcd.setCursor(0, 0);
 lcd.print("Temp: ");
 lcd.setCursor(0, 1);
 lcd.print("Humidity: ");
}
void loop() {
 // Read temperature (Celsius) and humidity
 float temp = dht.readTemperature();
 float hum = dht.readHumidity();
 
 // Check if readings failed
 //if (isnan(temp) || isnan(hum)) {
 //Serial.println("Error: Failed to read from DHT sensor!");
 //lcd.setCursor(0, 0);
 //lcd.print("Error reading   "); // Clear the line
 //lcd.setCursor(0, 1);
 //lcd.print("Humidity: --%   "); // Clear humidity line
 //delay(2000); // Wait before retrying
 //return;
 //}
 // Print temperature and humidity to Serial for debugging
 Serial.print("Temperature: ");
 Serial.print(temp);
 Serial.println(" °C");
 Serial.print("Humidity: ");
 Serial.print(hum);
 Serial.println(" %");
 // Clear previous values by overwriting with spaces
 lcd.setCursor(6, 0); // After "Temp: "
 lcd.print(" "); // Clear previous temperature value
 lcd.setCursor(6, 0);
 lcd.print(temp, 1);  // Display temperature with 1 decimal place  lcd.print((char)223); // Degree symbol
 lcd.print("C");
 
 lcd.setCursor(10, 1); // After "Humidity: "
 lcd.print("     ");   // Clear previous humidity value
 lcd.setCursor(10, 1);
 lcd.print(hum, 1);   // Display humidity with 1 decimal place
 lcd.print("%");
 
 delay(2000); // Update every 2 seconds
}