Voltaat learn (http://learn.voltaat.com)
 Link for full tutorial:
 DHT11 library:
 Adafruit sensor Library:
 Wire Library:
 LiquidCrystal I2C Library:

 Tutorial: Simple Weather Station with LCD Display
 
 Connections from the Arduino to the breadboard:
 
 • Arduino 5v pin → breadboard 5v line
 • Arduino GND pin → breadboard GND line


 Connection form the DHT11:

 • GND pin → Arduino GND pin
 • Signal pin → Arduino digital pin 2
 • VCC pin → Arduino 5V pin


 Connection from the raindrops sensor:

 • VCC pin → breadboard 5v line
 • GND pin → breadboard GND line
 • Signal pin → Arduino analog pin A0


 Connection from the LCD:

 • VCC pin → breadboard 5v line
 • GND pin→ breadboard GND line
 • SDA pin→ Arduino analog pin A4
 • SCL pin → Arduino analog pin A5


*/

// Define libraries
#include "Wire.h" // include the Wire library for I2C communication
#include "LiquidCrystal_I2C.h" // include the LiquidCrystal_I2C library for the LCD display
#include "DHT.h" // include the DHT library for the DHT11 sensor

const int rainSensorPin = A0; // The analog pin that the rain sensor is connected to
DHT dht (2, DHT11); // Initialize the DHT11 sensor on digital pin 2

const float heavyRainfallThreshold = 2.0; // Threshold for heavy rainfall

LiquidCrystal_I2C lcd(0x27, 16, 2); // Initialize the LCD display

float prevT = -999.0; // Initialize previous temperature to an invalid value
float prevH = -999.0; // Initialize previous humidity to an invalid value
bool prevRain = false; // Initialize previous rain value to false

//Commands inside void setup run once
void setup() {
 Serial.begin(9600); // Initialize serial communication at 9600 bits per second
 lcd.init(); // Initialize the LCD display
 lcd.backlight(); // Turn on the backlight
 dht.begin(); // Start the DHT11 sensor
 pinMode(rainSensorPin, INPUT); // Set the rain sensor pin as an input

 lcd.clear(); // Clear the LCD display
 lcd.setCursor(1, 0); // Set the cursor to the first row, second column
 lcd.print("Voltaat Learn"); // Display a welcome message
 delay(3000); // Wait for 3 seconds

 lcd.clear(); // Clear the LCD display
 lcd.setCursor(3, 0); // Set the cursor to the first row, fourth column
 lcd.print("Welcome to"); // Display a welcome message
 lcd.setCursor(1, 1); // Set the cursor to the second row, second column
 lcd.print("Weather Station"); // Display a welcome message
 delay(3000); // Wait for 3 seconds
}

//Commands inside void loop run forever
void loop() {
 float T = dht.readTemperature(); // Read the temperature from the DHT11 sensor
 float H = dht.readHumidity(); // Read the humidity from the DHT11 sensor
 int rainSensorValue = analogRead(rainSensorPin); // Read the value from the rain sensor
 bool isRaining = rainSensorValue < 500; // Determine if it is currently raining

 // Only update the display if the values have changed
 if (T != prevT || H != prevH || isRaining != prevRain) {
   lcd.setCursor(2, 0); // Set the cursor to the first row, third column
   lcd.print("Temp: "); // Display the temperature label
   lcd.print(T); // Display the temperature
   lcd.print((char)223); // Display the degree symbol
   lcd.print("C"); // Display the Celsius unit

   lcd.setCursor(0, 1); // Set the cursor to the second row, first column
   if (isRaining) { // If it is currently raining
     lcd.print("Raining "); // Display the rain status
   } else { // If it is not currently raining
     lcd.print("No Rain "); // Display the rain status
   }
   lcd.print("H:"); // Display the humidity label
   lcd.print(H); // Display the humidity
   lcd.print("%"); // Display the percentage symbol

   // Store the current values as previous values for the next update
   prevT = T;
   prevH = H;
   prevRain = isRaining;
 }

 delay(2000); // Wait for 2 seconds
}