---
title: "Building a Simple Web Server with M5Stack ATOM S3 and ATOMIC PoE W5500"
url: "https://maker.wiznet.io/irina/projects/building-a-simple-web-server-with-m5stack-atom-s3-and-atomic-poe-w5500/"
markdown_url: "https://maker.wiznet.io/irina/projects/building-a-simple-web-server-with-m5stack-atom-s3-and-atomic-poe-w5500/md"
type: "UCC: User Created Content"
author: "openlab"
author_url: "https://openelab.io/blogs/learn/building-a-simple-web-server-with-m5stack-atom-s3-and-atomic-poe-w5500?srsltid=AfmBOopW5ov5TvSPYRgBhpHzh2EVcgJ4cAaKOTboICSlkuf-1bJbToBy"
editor: "WIZnet"
editor_url: "https://maker.wiznet.io/"
original_author: "openlab"
original_url: "https://openelab.io/blogs/learn/building-a-simple-web-server-with-m5stack-atom-s3-and-atomic-poe-w5500?srsltid=AfmBOopW5ov5TvSPYRgBhpHzh2EVcgJ4cAaKOTboICSlkuf-1bJbToBy"
published: "2025-12-29"
language: "en"
likes: 0
views: 506
comments: 0
source: "WIZnet Makers (https://maker.wiznet.io/)"
---

# Building a Simple Web Server with M5Stack ATOM S3 and ATOMIC PoE W5500

> This project shows how to build a simple Ethernet web server using M5Stack Atom S3 and a W5500-based PoE module for stable, wired IoT access.

Original author: openlab (source: https://openelab.io/blogs/learn/building-a-simple-web-server-with-m5stack-atom-s3-and-atomic-poe-w5500?srsltid=AfmBOopW5ov5TvSPYRgBhpHzh2EVcgJ4cAaKOTboICSlkuf-1bJbToBy)

## Article

## 👤 AUTHOR / PLATFORM CONTEXT

This project is published on **OpenELAB**, a platform focused on hands-on tutorials and practical embedded system learning using modern maker hardware.

The content targets developers and engineers who want to quickly prototype **network-connected embedded applications** using modular hardware platforms such as M5Stack.

---

## 🎯 PROJECT DESCRIPTION

This UCC demonstrates how to build a **simple embedded web server** using:

- **M5Stack Atom S3** (ESP32-S3 based controller)

- **Atomic PoE (W5500)** Ethernet module

The project shows how a compact ESP32-S3 device can serve web pages over **wired Ethernet**, enabling reliable access to device status and controls through a standard web browser.

Rather than focusing on complex frameworks, the tutorial emphasizes **clarity, simplicity, and practical Ethernet usage**.

---

## 🧩 HARDWARE COMPONENTS

### 🔧 Core Hardware

- **M5Stack Atom S3**
  - ESP32-S3 MCU
  - Compact form factor
  - USB-C programming interface

- **Atomic PoE Ethernet Module**
  - WIZnet **W5500 Ethernet controller**
  - SPI interface
  - PoE support for simplified power + data delivery

![](https://maker.wiznet.io/upload/ckeditor5/219641638%5F1767599091%2Epng)

![](https://maker.wiznet.io/upload/ckeditor5/219641638%5F1767599101%2Epng)

## 🧩SOFTWARE

- Arduino IDE (with ESP32 board support)

- M5Stack library for ATOM S3

![](https://maker.wiznet.io/upload/ckeditor5/219641638%5F1767599137%2Epng)

### 🌐 Networking

- Wired Ethernet (TCP/IP)

- Embedded HTTP web server

---

## 🧠 SYSTEM OVERVIEW

```plaintext
[Web Browser (PC / Mobile)]
            ↓
        Ethernet
            ↓
   WIZnet W5500 (Atomic PoE)
            ↓  SPI
     ESP32-S3 (Atom S3)
            ↓
     Web Server Logic
```

The ESP32-S3 handles application logic and HTTP responses,
while the **W5500 offloads all TCP/IP processing**, providing a stable Ethernet connection.

---

## 🧠 REFERENCE TO ORIGINAL

![](https://maker.wiznet.io/upload/ckeditor5/219641638%5F1767599397%2Epng)

![](https://maker.wiznet.io/upload/ckeditor5/219641638%5F1767599272%2Epng)

---

## 🧠 ENGINEERING – FOCUSED INSIGHTS

### ✔ Why W5500 Matters in This Project

Although the ESP32-S3 includes Wi-Fi, this project deliberately uses **wired Ethernet** to achieve:

- predictable latency

- stable connectivity

- independence from Wi-Fi quality or access points

The **W5500’s hardware TCP/IP stack** significantly reduces firmware complexity and CPU load, making it easier to implement a reliable web server on a small MCU.

### ✔ PoE for Clean Embedded Deployment

By using the Atomic PoE module, the system can receive:

- power

- network connectivity

over a single Ethernet cable—an important advantage for:

- wall-mounted devices

- industrial panels

- remote or hard-to-access installations

---

## 🧪 USE CASES

- Embedded device configuration pages

- Network-enabled sensors and controllers

- Industrial or building automation panels

- Educational Ethernet + HTTP examples

- IoT edge devices requiring stable wired access

---

## 📘 KEY TAKEAWAYS

- Demonstrates **ESP32-S3 + W5500** as a practical Ethernet web server platform

- Shows how PoE simplifies real-world deployment

- Highlights the value of **hardware TCP/IP offloading** in small embedded systems

- Provides a clear, reproducible starting point for Ethernet-based IoT devices

## 🏷 TAGS

#M5Stack #AtomS3 #W5500 #EthernetWebServer #PoE #EmbeddedHTTP #IoTNetworking
#ESP32S3

---

Source: https://maker.wiznet.io/irina/projects/building-a-simple-web-server-with-m5stack-atom-s3-and-atomic-poe-w5500/