Wokwi - Online ESP32, STM32, Arduino Simulator

#include <WiFi.h>
#include <WebServer.h>

const char* ssid = "Ziggo2692437";
const char* password = "rW3iriycAgwzvwjs";

WebServer server(80);

const int ledPins[] = {25, 26, 27, 33};

void handleRoot() {
  String html = "<html><body>";
  for(int i = 0; i < 4; i++) {
    html += "<h1>LED " + String(i+1) + "</h1>";
    html += "<button onclick=\"location.href='/on?led=" + String(i) + "'\">ON</button>";
    html += "<button onclick=\"location.href='/off?led=" + String(i) + "'\">OFF</button><br><br>";
  }
  html += "</body></html>";
  server.send(200, "text/html", html);
}

void handleOn() {
  if(server.hasArg("led")) {
    int led = server.arg("led").toInt();
    if(led >= 0 && led < 4) {
      digitalWrite(ledPins[led], HIGH);
      server.send(200, "text/html", "LED " + String(led+1) + " is ON");
    }
  }
}

void handleOff() {
  if(server.hasArg("led")) {
    int led = server.arg("led").toInt();
    if(led >= 0 && led < 4) {
      digitalWrite(ledPins[led], LOW);
      server.send(200, "text/html", "LED " + String(led+1) + " is OFF");
    }
  }
}

void setup() {
  Serial.begin(115200);
  for(int i = 0; i < 4; i++) {
    pinMode(ledPins[i], OUTPUT);
    digitalWrite(ledPins[i], LOW);
  }

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

  server.on("/", handleRoot);
  server.on("/on", handleOn);
  server.on("/off", handleOff);
  server.begin();
}

void loop() {
  server.handleClient();
}