Wokwi - Online ESP32, STM32, Arduino Simulator

#include <WiFi.h>
#include <ESPAsyncWebServer.h>

#define LED_PIN 18  

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

AsyncWebServer server(80);

int LED_state = LOW;

String getHTML() {
  String html = "<!DOCTYPE HTML>";
  html += "<html>";
  html += "<head>";
  html += "<link rel='icon' href='data:,'>";
  html += "</head>";
  html += "<body>";
  html += "<p>LED state: <span style='color: red;'>";

  if (LED_state == LOW)
    html += "OFF";
  else
    html += "ON";

  html += "</span></p>";
  html += "<a href='/led1/on'>Turn ON</a>";
  html += "<br><br>";
  html += "<a href='/led1/off'>Turn OFF</a>";
  html += "</body>";
  html += "</html>";

  return html;
}

void setup() {
  Serial.begin(115200);
  pinMode(LED_PIN, OUTPUT);
  digitalWrite(LED_PIN, LED_state);

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

  
  Serial.print("ESP32 Web Server's IP address: ");
  Serial.println(WiFi.localIP());

  
  server.on("/", HTTP_GET, [](AsyncWebServerRequest *request) {
    Serial.println("ESP32 Web Server: New request received:");
    Serial.println("GET /");
    request->send(200, "text/html", getHTML());
  });

  
  server.on("/led1/on", HTTP_GET, [](AsyncWebServerRequest *request) {
    Serial.println("ESP32 Web Server: New request received:");
    Serial.println("GET /led1/on");
    LED_state = HIGH;
    digitalWrite(LED_PIN, LED_state);
    request->send(200, "text/html", getHTML());
  });
  
  server.on("/led1/off", HTTP_GET, [](AsyncWebServerRequest *request) {
    Serial.println("ESP32 Web Server: New request received:");
    Serial.println("GET /led1/off");
    LED_state = LOW;
    digitalWrite(LED_PIN, LED_state);
    request->send(200, "text/html", getHTML());
  });

  
  server.begin();
}

void loop() {
}