Wokwi - Online ESP32, STM32, Arduino Simulator

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

#define DHTPIN 4
#define DHTTYPE DHT22
#define RAINPIN 5

const char* ssid = "YOUR_WIFI_SSID";
const char* password = "YOUR_WIFI_PASSWORD";

DHT dht(DHTPIN, DHTTYPE);
LiquidCrystal_I2C lcd(0x27, 16, 2);
WebServer server(80);

void handleRoot() {
  float humidity = dht.readHumidity();
  float temperature = dht.readTemperature();
  int rain = digitalRead(RAINPIN);

  String webpage = "<!DOCTYPE html><html><head>";
  webpage += "<meta http-equiv='refresh' content='5'>";
  webpage += "<title>Sensor Data</title></head><body>";
  webpage += "<h1>Sensor Readings</h1>";
  webpage += "<p>Temperature: " + String(temperature, 1) + " C</p>";
  webpage += "<p>Humidity: " + String(humidity, 0) + "%</p>";
  webpage += "<p>Rain: " + String(rain == HIGH ? "No" : "Yes") + "</p>";
  webpage += "</body></html>";

  server.send(200, "text/html", webpage);
}

void setup() {
  Wire.begin(8, 9);
  lcd.init();
  lcd.backlight();
  dht.begin();
  pinMode(RAINPIN, INPUT);

  Serial.begin(115200);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }
  Serial.println("Connected to WiFi");
  Serial.println(WiFi.localIP());

  server.on("/", handleRoot);
  server.begin();

  lcd.setCursor(0, 0);
  lcd.print("Starting...");
  delay(2000);
  lcd.clear();
}

void loop() {
  server.handleClient();

  float humidity = dht.readHumidity();
  float temperature = dht.readTemperature();
  int rain = digitalRead(RAINPIN);

  if (isnan(humidity) || isnan(temperature)) {
    lcd.setCursor(0, 0);
    lcd.print("DHT Error!      ");
    lcd.setCursor(0, 1);
    lcd.print("Rain: ");
    lcd.print(rain == HIGH ? "No" : "Yes");
    delay(2000);
    lcd.clear();
    return;
  }

  lcd.setCursor(0, 0);
  lcd.print("T:");
  lcd.print(temperature, 1);
  lcd.print("C H:");
  lcd.print(humidity, 0);
  lcd.print("%    ");

  lcd.setCursor(0, 1);
  lcd.print("Rain: ");
  lcd.print(rain == HIGH ? "No" : "Yes");
  lcd.print("    ");

  delay(2000);
}