IoT Temperature & Humidity Monitoring Station with DHT11 & 16x2 LCD

/*
 * Project: IoT Temperature & Humidity Monitoring Station
 * Author: ElectronLab STEM Curriculum
 */

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

#define DHTPIN 2
#define DHTTYPE DHT11

DHT dht(DHTPIN, DHTTYPE);
LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() {
  Serial.begin(9600);
  dht.begin();
  
  lcd.init();
  lcd.backlight();
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Climate Monitor");
  lcd.setCursor(0, 1);
  lcd.print("Initializing...");
  delay(1500);
  lcd.clear();
}

void loop() {
  // Reading temperature or humidity takes about 250 milliseconds
  float humidity = dht.readHumidity();
  float tempC = dht.readTemperature();
  float tempF = dht.readTemperature(true);

  // Check if any reads failed and exit early (to try again)
  if (isnan(humidity) || isnan(tempC)) {
    Serial.println("Failed to read from DHT sensor!");
    lcd.setCursor(0, 0);
    lcd.print("Sensor Read Err ");
    delay(2000);
    return;
  }

  // Compute Heat Index in Celsius
  float heatIndexC = dht.computeHeatIndex(tempC, humidity, false);

  // Print to Serial Monitor
  Serial.print("Humidity: ");
  Serial.print(humidity, 1);
  Serial.print("% | Temp: ");
  Serial.print(tempC, 1);
  Serial.print(" C | Heat Index: ");
  Serial.print(heatIndexC, 1);
  Serial.println(" C");

  // Display on 16x2 LCD
  lcd.setCursor(0, 0);
  lcd.print("Temp: ");
  lcd.print(tempC, 1);
  lcd.print((char)223); // Degree symbol
  lcd.print("C   ");

  lcd.setCursor(0, 1);
  lcd.print("Humidity: ");
  lcd.print(humidity, 1);
  lcd.print("%  ");

  delay(2000); // Sample rate 0.5 Hz
}