---
title: "Serveur Asynchrone Web Server W5500 + ESP"
url: "https://maker.wiznet.io/jaden/projects/serveur-asynchrone-web-server-w5500-esp/"
markdown_url: "https://maker.wiznet.io/jaden/projects/serveur-asynchrone-web-server-w5500-esp/md"
type: "UCC: User Created Content"
author: "F1ATB André"
author_url: "https://f1atb.fr/fr/serveur-web-asynchrone-sur-un-esp32-s3-en-ethernet-ou-wifi/"
editor: "WIZnet"
editor_url: "https://maker.wiznet.io/"
original_author: "F1ATB André"
original_url: "https://f1atb.fr/fr/serveur-web-asynchrone-sur-un-esp32-s3-en-ethernet-ou-wifi/"
published: "2025-10-28"
language: "en"
hardware: ["WIZnet W5500"]
likes: 0
views: 716
comments: 0
source: "WIZnet Makers (https://maker.wiznet.io/)"
---

# Serveur Asynchrone Web Server W5500 + ESP

> Serveur Asynchrone Web Server W5500 + ESP

Original author: F1ATB André (source: https://f1atb.fr/fr/serveur-web-asynchrone-sur-un-esp32-s3-en-ethernet-ou-wifi/)

## Components

- **WIZnet W5500** x 1 ([docs](https://docs.wiznet.io/Product/Chip/Ethernet/W5500))

WIZnet parts: W5500 ([Datasheet](https://docs.wiznet.io/Product/Chip/Ethernet/W5500/datasheet?utm_source=maker&utm_medium=project&utm_campaign=w5500), [product hub](https://maker.wiznet.io/products/w5500/))

## Article

### Asynchronous Web Server on ESP32-S3 (Ethernet + Wi-Fi)

This project is based on **André F1ATB’s** implementation of an asynchronous web server for the ESP32-S3 board, enabling both **wired Ethernet (via W5500)** and **Wi-Fi** connections on the same device.

#### Hardware Used

![](https://maker.wiznet.io/upload/ckeditor5/197928551%5F1761751536%2Epng)

**Board**: T-ETH-LITE ESP32-S3 (N16R8 configuration)

Dual-core ESP32-S3, 512 KB internal RAM, 16 MB SPI Flash, 8 MB PSRAM

**Connectivity**: Wi-Fi (802.11 b/g/n 2.4 GHz), Bluetooth LE 5.0, Ethernet (W5500 100 Mb/s)

**Other Interfaces**: RJ-45 (PoE support), SPI / I²C / I²S / UART / ADC / DAC / USB

#### Main Implementation Details

**Dual Network Support** – The ESP32-S3 can operate over both Wi-Fi and Ethernet simultaneously.

**Library** – `AsyncWebServer_ESP32_SC_W5500.h`
This library is **specifically designed for the lwIP + W5500 Ethernet combination**, and works on both PlatformIO and Arduino IDE. It integrates Ethernet (W5500) and Wi-Fi interfaces under a unified asynchronous web-server framework.

**Flash Partitioning**

NVS / OTA data area

Two OTA application slots (app0, app1)

SPIFFS area for web assets

#### Design Considerations

**SPI Bus Conflicts** – If W5500 and the SD card share the same SPI bus, use a separate bus or re-map pins.

**Ethernet Interface** – Operates over SPI; although slightly slower than an internal MAC/PHY, it is more than adequate for IoT and web server tasks.

![](https://maker.wiznet.io/upload/ckeditor5/197928551%5F1761751551%2Epng)

**Programming Notes** – No on-board USB interface; requires an external FTDI232 adapter (3.3 V level). Boot/reset sequence must be observed during flashing.

#### Why It Matters

This project demonstrates how ESP32-S3 can seamlessly combine wired Ethernet and Wi-Fi using a single codebase.
With the W5500 and the asynchronous web server library, developers can extend existing Wi-Fi-based projects to wired Ethernet with minimal changes.

#### Example Applications

Home automation gateway

Sensor hub / industrial IoT controller

Web content server using OTA and SPIFFS

#### Conclusion

The project highlights the power of the **“MAC + PHY chip (W5500) + lwIP software stack”** architecture.
Its asynchronous server design makes excellent use of the ESP32-S3’s dual cores and PSRAM, and offers an efficient and scalable solution for IoT systems requiring both Wi-Fi and Ethernet connectivity.

---

Source: https://maker.wiznet.io/jaden/projects/serveur-asynchrone-web-server-w5500-esp/