Ethernet Shield

The Ethernet Shield is a powerful expansion module designed to bring network connectivity to your Arduino boards. Whether you’re working on a home automation system, an IoT device, or a remote data logger, this shield allows your Arduino to connect to the internet or a local LAN.

Powered by the W5100 Ethernet chipset, this shield supports both TCP and UDP protocols, making it suitable for a variety of network applications. Furthermore, it offers four simultaneous socket connections, allowing your Arduino to handle multiple requests or communicate with several devices at once.

One of its most useful features is the built-in microSD card slot. This enables your project to store or log data directly to an SD card, which is particularly useful for servers or IoT sensors that collect data over time. Additionally, the shield uses the SPI interface, which ensures fast communication with both the Ethernet controller and the SD card.

Designed to stack seamlessly on top of your Arduino Uno, Mega, or other compatible boards, it also includes a reset button, indicator LEDs, and a standard RJ-45 port. With plug-and-play support and sample libraries included in the Arduino IDE, it’s a beginner-friendly way to get your projects online.

For enhanced performance, you can combine it with modules from our Arduino and Accessories and IoT Modules categories.

Key Features

• ✅ W5100 Ethernet Controller

• ✅ Supports TCP and UDP communication

• ✅ Built-in microSD card slot for data logging

• ✅ Supports 4 simultaneous socket connections

• ✅ Plug-and-play with Arduino Uno, Mega

• ✅ Onboard reset button and status LEDs

• ✅ Uses SPI interface for communication

Applications and Use Cases

• 🌐 Build web servers with Arduino

• 📡 Create IoT data loggers

• 🏠 Develop smart home automation devices

• 🔧 Use in industrial machine monitoring systems

• 📊 Log sensor data to a microSD and send it online

• 💡 Enable remote control and monitoring over LAN

Technical Specifications

• Chipset: W5100

• Protocols: TCP, UDP

• SD Card Slot: Yes (microSD, SPI-based)

• Compatible Boards: Arduino Uno, Mega, Leonardo

• Communication Interface: SPI

• Socket Connections: Up to 4

• Power Supply: 5V (via Arduino)

• RJ-45 Port: Standard Ethernet connector

• Dimensions: Arduino shield form factor

Precautions

• ⚠️ Avoid plugging/unplugging while powered on

• ⚠️ Ensure correct SPI pin usage when using with Mega

• ⚠️ Use a formatted FAT32 SD card for logging

• ⚠️ Keep away from moisture and static discharge

Recommended Pairings

• Works seamlessly with Arduino Uno or Mega Boards

• Combine with IoT sensors and modules from the Electronics Components section

• Enhance your toolkit with devices from Tools and Accessories

📺 YouTube Tutorial

Watch: How to Use the Ethernet Shield W5100 with Arduino

🛒 Buy Now

Order your Ethernet Shield from our Arduino and Accessories section and bring your Arduino projects online with ease.