---
title: "LILYGO® T-Relay-W5500 Ethernet Shield"
url: "https://maker.wiznet.io/sophia/resellers/lilygo-t-relay-w5500-ethernet-shield/"
markdown_url: "https://maker.wiznet.io/sophia/resellers/lilygo-t-relay-w5500-ethernet-shield/md"
type: "VAR: Value-Added Reseller Products"
author: "lilygo"
author_url: "https://www.facebook.com/groups/lilygo/posts/lilygo-t-relay-w5500-ethernet-shield-used-for-t-relay-4-way-or-8-way-development/1281380647352302/"
editor: "WIZnet"
editor_url: "https://maker.wiznet.io/"
original_author: "lilygo"
original_url: "https://www.facebook.com/groups/lilygo/posts/lilygo-t-relay-w5500-ethernet-shield-used-for-t-relay-4-way-or-8-way-development/1281380647352302/"
published: "2025-11-12"
language: "en"
hardware: ["WIZnet W5500"]
likes: 0
views: 362
comments: 0
source: "WIZnet Makers (https://maker.wiznet.io/)"
---

# LILYGO® T-Relay-W5500 Ethernet Shield

> An Ethernet expansion shield designed for the LILYGO T-Relay 4-Way and 8-Way development boards.

Original author: lilygo (source: https://www.facebook.com/groups/lilygo/posts/lilygo-t-relay-w5500-ethernet-shield-used-for-t-relay-4-way-or-8-way-development/1281380647352302/)

## 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

The **LILYGO T-Relay-W5500 Ethernet Shield** is a compact Ethernet interface board based on the **WIZnet W5500** chip, designed to add wired LAN connectivity to LILYGO’s T-Relay series (4-channel and 8-channel relay boards).
It communicates with the main relay board via an SPI interface, offering 10/100 Mbps Ethernet performance with a hardware TCP/IP stack for reliable IoT and industrial applications.

### 🚀 Key Features

**WIZnet W5500 Ethernet controller** with hardware TCP/IP offload engine

**SPI interface** for seamless connection to T-Relay boards

**Supports 10/100 Mbps Ethernet** for stable and fast wired connections

**Compact shield design** that fits both 4-way and 8-way T-Relay boards

**Ideal for IoT automation**, industrial control, and smart home relay networks

**Low cost** (around US $8–9), making it an accessible option for prototyping and student projects

### 💡 Typical Applications

Smart Home relay control systems

Industrial IoT controllers with wired network communication

Remote device management and monitoring platforms

Lab and automation projects that require reliable Ethernet connectivity

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## ⚙️ Technical Notes

Designed to work exclusively with **LILYGO T-Relay 4-Way and 8-Way** boards

Requires basic programming knowledge and pin configuration for integration

Documentation and examples are available on the [official LILYGO GitHub repository](https://github.com/Xinyuan-LilyGO/LilyGo-T-Relay?utm_source=chatgpt.com)

Compatible with Arduino and ESP32 environments

## 📎 Links

[Product Page (AliExpress)](https://s.click.aliexpress.com/e/_oBOHUie)

[Official LILYGO Store Page](https://lilygo.cc/en-ca/products/t-relay-w5500-shield?utm_source=chatgpt.com)

[GitHub Repository – LILYGO T-Relay](https://github.com/Xinyuan-LilyGO/LilyGo-T-Relay?utm_source=chatgpt.com)

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Source: https://maker.wiznet.io/sophia/resellers/lilygo-t-relay-w5500-ethernet-shield/