Can You Run a Web Server on Arduino?


Larry Thompson

Can You Run a Web Server on Arduino?

Arduino is a popular open-source electronics platform that allows you to create interactive projects. It’s widely used by hobbyists, makers, and professionals alike. While Arduino is primarily known for controlling physical devices, you might be surprised to learn that it is indeed possible to run a web server on an Arduino board.

Why Run a Web Server on Arduino?

The idea of running a web server on such a tiny microcontroller might seem impractical at first. However, there are several scenarios where having a web server on your Arduino can be incredibly useful.

  • Remote Control: By running a web server on your Arduino, you can remotely control and monitor your projects from anywhere in the world. This opens up endless possibilities for home automation, robotics, and IoT applications.
  • Data Logging: With a web server on your Arduino, you can log sensor data and store it in a database. This allows you to easily analyze and visualize the collected data.
  • User Interface: By accessing the web server hosted on your Arduino, you can create an intuitive user interface that lets users interact with your project without the need for specialized software.

How Does It Work?

To run a web server on an Arduino board, you’ll need an Ethernet or Wi-Fi shield/module that provides network connectivity. These add-ons allow the Arduino to communicate with other devices over the internet.

The process involves setting up your Arduino as a client-server system. The client (your computer or smartphone) sends HTTP requests to the server (the Arduino), which then responds with appropriate HTTP responses. These responses can contain HTML pages, sensor readings, or any other data you want to share.

Getting Started

Before diving into running a web server on Arduino, you’ll need to make sure you have the necessary hardware and software:

  • An Arduino board (such as Arduino Uno or Arduino Mega)
  • An Ethernet or Wi-Fi shield/module
  • The Arduino IDE (Integrated Development Environment)

Once you have everything set up, you can start by connecting the Ethernet or Wi-Fi shield to your Arduino board. Then, open the Arduino IDE and follow these steps:

  1. Create a new sketch.
  2. Include the necessary libraries for networking (depending on your shield/module).
  3. Set up the network connection by providing your network credentials (if using Wi-Fi) or using DHCP (if using Ethernet).
  4. Create a web server object and define the handling of incoming HTTP requests.
  5. Write the HTML content that will be sent as responses.
  6. Upload the sketch to your Arduino board.

A Simple Example

Here’s a simple example to get you started:

#include <WiFi.h>

const char* ssid = "YourNetworkSSID";
const char* password = "YourNetworkPassword";

WiFiServer server(80);

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

void loop() {
  WiFiClient client = server.available();
  if (client) {
    Serial.println("New client connected");
    client.println("HTTP/1.1 200 OK");

Hello, Arduino Web Server!

"); client.println(""); client.println(""); delay(100); client.stop(); Serial.println("Client disconnected"); } }

This example creates a simple web server that responds with an HTML page containing a heading when accessed. You can customize the HTML content to suit your needs and add more functionality as required.


Running a web server on Arduino opens up a world of possibilities for remote control, data logging, and creating user interfaces. With the right hardware and software setup, you can create impressive projects that interact with the web. So go ahead, experiment with Arduino web servers, and unleash your creativity!

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