Wokwi - Online ESP32, STM32, Arduino Simulator

#include <WiFi.h>
#include "DHT.h"

#define DHTPIN 4       // DHT22 pin
#define DHTTYPE DHT22
#define LED 2           // LED pin

DHT dht(DHTPIN, DHTTYPE);

// Replace with your WiFi credentials
const char* ssid = "YOUR_WIFI_SSID";
const char* password = "YOUR_WIFI_PASSWORD";

WiFiServer server(80);

void setup() {
  Serial.begin(115200);
  dht.begin();
  pinMode(LED, OUTPUT);

  // Connect to WiFi
  WiFi.begin(ssid, password);
  Serial.print("Connecting to WiFi");
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("\nWiFi connected");
  Serial.print("ESP32 IP Address: ");
  Serial.println(WiFi.localIP());

  server.begin();
}

void loop() {
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();

  if (isnan(temperature) || isnan(humidity)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }

  if (temperature > 30) {
    digitalWrite(LED, HIGH);
  } else {
    digitalWrite(LED, LOW);
  }

  WiFiClient client = server.available();
  if (client) {
    String request = client.readStringUntil('\r');
    client.flush();

    String html = "<!DOCTYPE html><html><head><meta http-equiv='refresh' content='2'/>"
                  "<title>ESP32 Temperature</title></head><body>"
                  "<h1>ESP32 DHT22 Sensor</h1>"
                  "<p>Temperature: " + String(temperature) + " °C</p>"
                  "<p>Humidity: " + String(humidity) + " %</p>"
                  "</body></html>";

    client.println("HTTP/1.1 200 OK");
    client.println("Content-type:text/html");
    client.println();
    client.print(html);
    client.stop();
  }

  delay(2000);
}