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How to Build a Reliable USB Serial Web Bridge with W5500 on ESP32-S3?

This ESP32-S3 project exposes a USB-hosted serial device through a browser-based HTTP/WebSocket terminal and uses the WIZnet W5500

viktor

Published July 09, 2026

168 UCC

20 WCC

42 VAR

Original author: mwinters-stuffOriginal source (new tab)

How to Build a Reliable USB Serial Web Bridge with W5500 on ESP32-S3?

Project description

Summary This ESP32-S3 project exposes a USB-hosted serial device through a browser-based HTTP/WebSocket terminal and uses the WIZnet W5500 as the preferred wired network interface. The W5500 provides the Ethernet path for web terminal access, DHCP-based IP assignment, and mDNS discovery, while the ESP32-S3 handles USB Host CDC/VCP serial bridging, buffering, the web UI, and firmware/filesystem upload services. What the Project Does The project turns an ESP32-S3 board into a network-accessible serial console. A USB serial adapter or USB CDC device connects to the ESP32-S3 USB Host port, the…

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