How Use Arduino as a Web Server?


Scott Campbell

Arduino is a versatile microcontroller that can be used for a wide range of projects. One interesting application is using Arduino as a web server. In this tutorial, we will explore how to set up an Arduino as a web server and control it using a web browser.

What is a Web Server?
A web server is a computer program that delivers content to clients over the internet. It responds to requests from clients, such as web browsers, by sending back the requested files or executing specific actions. In our case, we will use the Arduino as the web server, and the client will be a web browser.

Setting Up the Hardware
Before we start coding, let’s set up the hardware. You will need an Arduino board (such as Arduino Uno), an Ethernet shield or module, and some wires to connect them together. The Ethernet shield/module allows the Arduino to connect to the internet and serve web pages.

  • Connect one end of an Ethernet cable to your router’s LAN port.
  • Connect the other end of the Ethernet cable to your Ethernet shield/module.
  • Insert the shield/module onto your Arduino board.
  • Connect your Arduino board to your computer using a USB cable.

Installing Required Libraries
To make our life easier, we’ll use some libraries that simplify working with Ethernet and serving web pages on Arduino. These libraries include “Ethernet.h” and “SPI.h”. To install them:

  1. Open the Arduino IDE.
  2. Go to Sketch -> Include Library -> Manage Libraries.
  3. Type “Ethernet” in the search box.
  4. Select “Ethernet” by Adafruit and click on “Install”.
  5. Type “SPI” in the search box.
  6. Select “SPI” by Arduino and click on “Install”.

Writing the Code
Now, let’s dive into the coding part. Open a new sketch in the Arduino IDE and start by including the required libraries:

#include <Ethernet.h>

#include <SPI.h>

Next, we need to define some variables to set up our web server:

EthernetServer server(80);

In the setup function, we need to initialize the Ethernet library and start the server:

void setup() {

Ethernet.begin(mac); // Replace ‘mac’ with your Ethernet shield/module MAC address.



In the loop function, we will handle incoming client requests and serve web pages. We will check if a client is connected, read its request, and send back a response:

void loop() {

EthernetClient client = server.available(); // Check for incoming clients.

if (client) { // If a client is connected.

  • // Read the request from the client.
  • // Process the request and generate a response.
  • // Send back the response to the client.
  • // Here’s an example of sending a simple HTML page as a response:
    • // Set HTTP response headers.
    • // Send the HTML content.



Testing the Web Server
To test our Arduino web server, we need to upload the code to the Arduino board. Make sure your Arduino board is selected in the IDE, then click on the “Upload” button. Once uploaded, open a web browser and enter your Arduino’s IP address in the address bar.

If everything is set up correctly, you should see the HTML page that we sent as a response. You can further enhance your web server by adding more functionality like controlling external devices or sensors.

In this tutorial, we learned how to use an Arduino as a web server. We explored the necessary hardware setup, library installation, and basic code structure for serving web pages. With this knowledge, you can create your own projects that can be controlled remotely using a web browser.

Remember to experiment and have fun with your Arduino-based web server projects!

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