Can Arduino Send Data to Web Server?


Scott Campbell

Can Arduino Send Data to Web Server?

Arduino is a versatile microcontroller platform that can be used for various projects. One common requirement in many projects is the ability to send data from an Arduino board to a web server. Whether you are building a weather station, home automation system, or a remote monitoring device, being able to send data to a web server opens up a world of possibilities.

What is a Web Server?

A web server is a computer program or device that hosts websites and serves them to clients upon request. It stores and delivers web pages and other files over the internet using standard protocols such as HTTP. In simple terms, when you type a website address in your browser, the browser sends a request to the web server hosting that website, and the server responds by sending the requested files back to the browser.

How Can Arduino Send Data to a Web Server?

Arduino boards are equipped with built-in or add-on networking capabilities that enable them to communicate with other devices over the internet. To send data from an Arduino board to a web server, you need:

  • An Arduino board with networking capabilities (such as Ethernet or Wi-Fi)
  • A compatible Ethernet shield or Wi-Fi module
  • A web server that can receive and process incoming data

Once you have these components ready, you can follow these steps:

  1. Create an HTML form: Start by creating an HTML form on your web server that will receive the data sent from Arduino. This form should include input fields for the data you want to collect.
  2. Connect Arduino to the internet: Use either an Ethernet shield or a Wi-Fi module to connect your Arduino board to the internet. Configure the network settings and ensure that your Arduino can establish a connection.
  3. Read sensor data: If you are collecting sensor data, use appropriate sensors connected to your Arduino board to read the data.

    Store the data in variables for transmission.

  4. Send data to the web server: Use Arduino’s networking library (such as Ethernet.h or WiFi.h) to establish a connection with the web server. Use HTTP POST or GET requests to send the collected data to the server using the form’s Target URL.
  5. Process data on the web server: On the web server, write a script (such as PHP or Python) that will receive the incoming data and process it. You can store it in a database, display it on a webpage, or perform any other desired actions.

Example: Sending Temperature Data from Arduino to Web Server

To illustrate how Arduino can send data to a web server, let’s consider an example where we want to send temperature readings from an Arduino-based weather station to a web server.

In this scenario, we would:

  1. Create an HTML form on our web server that includes an input field for temperature.
  2. Connect an Ethernet shield or Wi-Fi module to our Arduino board and configure it for internet connectivity.
  3. Read temperature values from a temperature sensor connected to our Arduino board.
  4. Use Arduino’s networking library (such as Ethernet.h) to send an HTTP POST request containing the temperature value to our web server’s URL specified in the HTML form.
  5. On our web server, use a scripting language like PHP to receive the temperature value and store it in a database or perform any other desired actions.

By following these steps, we can effectively send temperature data from our Arduino-based weather station to our web server for further processing or display.


Arduino can indeed send data to a web server with the help of networking capabilities and appropriate libraries. By establishing a connection with the server and using HTTP requests, you can transmit data collected by your Arduino board to a web server for further processing or display. This opens up endless possibilities for remote monitoring, data logging, and integration with web-based applications.

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