LILYGO® T-Relay-W5500 Ethernet Shield
An Ethernet expansion shield designed for the LILYGO T-Relay 4-Way and 8-Way development boards.
WIZnet - W5500
x 1
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
⚙️ 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
Compatible with Arduino and ESP32 environments