Wokwi - Online ESP32, STM32, Arduino Simulator

#include <WiFi.h>         // For ESP32 (use <ESP8266WiFi.h> for ESP8266)
#include <WebServer.h>    // For creating a web server


// Wi-Fi Credentials
const char* ssid = "Wokwi-WiFi";       // Wi-Fi network name
const char* password = "12345678";     // Wi-Fi password


// Pin Definitions
const int ledPin = 2;  // Built-in LED for ESP32 (use D4 for ESP8266)


// Web Server
WebServer server(80);  // HTTP server on port 80


// Light State
bool lightState = false;


// Function to generate the HTML webpage
String generateHTML() {
  String html = "<!DOCTYPE html><html>";
  html += "<head><title>IoT Smart Light</title></head>";
  html += "<body style='text-align:center; font-family:Arial;'>";
  html += "<h1>IoT Smart Light Control</h1>";
  html += "<p>Light is currently: <strong>" + String(lightState ? "ON" : "OFF") + "</strong></p>";
  html += "<a href=\"/toggle\" style='display:inline-block; padding:10px 20px; background:#007BFF; color:white; text-decoration:none; border-radius:5px;'>Toggle Light</a>";
  html += "</body></html>";
  return html;
}


// Handle root URL
void handleRoot() {
  server.send(200, "text/html", generateHTML());
}


// Handle light toggle
void handleToggle() {
  lightState = !lightState;
  digitalWrite(ledPin, lightState ? HIGH : LOW);
  server.send(200, "text/html", generateHTML());
}


void setup() {
  pinMode(ledPin, OUTPUT);
  digitalWrite(ledPin, LOW);  // Turn off LED initially


  Serial.begin(115200);       // Start serial monitor
  Serial.println("Starting...");


  // Connect to Wi-Fi
  WiFi.begin(ssid, password);
  Serial.print("Connecting to Wi-Fi");
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.print(".");
  }
  Serial.println("\nConnected!");
  Serial.print("IP Address: ");
  Serial.println(WiFi.localIP());  // Print IP address


  // Start the web server
  server.on("/", handleRoot);
  server.on("/toggle", handleToggle);
  server.begin();
  Serial.println("Web server started.");
}


void loop() {
  server.handleClient();  // Handle HTTP requests
}