DIYables W5100 Ethernet Shield for Arduino Uno R3, Arduino R4, Arduino Mega
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Quick Overview
The DIYables W5100 Ethernet Shield brings wired network connectivity to your Arduino UNO-form factor boards (UNO R3, UNO R4 WiFi, UNO R4 Minima, Leonardo, Zero) and Mega-form factor boards (Mega 2560, Due, Giga R1 WiFi). Powered by the proven W5100 chipset with hardware TCP/IP stack, this shield enables your Arduino to connect to local networks and the internet via a standard RJ45 Ethernet port. Perfect for IoT projects, web servers, network-connected sensors, home automation hubs, data logging systems, and any application requiring reliable wired connectivity.
Simply plug the shield onto your Arduino board and connect an Ethernet cable—no complex wiring or breadboards needed. The W5100 chip handles all the TCP/IP protocol processing in hardware, freeing up your Arduino's processing power for your application logic. Support for both TCP and UDP protocols enables web servers, REST API clients, MQTT communication, email notifications, time synchronization, and network data exchange. The integrated micro SD card slot provides convenient data storage for logging network data, serving web files, or storing configuration settings.
Whether you're building a home automation controller, environmental monitoring station, remote sensor network, industrial control system, or web-enabled Arduino project, this Ethernet shield provides professional-grade wired connectivity. Compatible with Arduino's standard Ethernet library for easy programming with extensive community support. Complete with comprehensive tutorials, example code for web servers and clients, and ready-to-use sketches—get your Arduino online in minutes. Perfect for makers, students, hobbyists, and professionals building reliable network-connected devices.
Key Features
- W5100 Hardware TCP/IP Engine — Proven W5100 Ethernet controller with integrated hardware TCP/IP stack handles all network protocols automatically, freeing Arduino resources for application logic
- Standard RJ45 Ethernet Port — Industry-standard RJ45 connector provides reliable wired network connection using standard Ethernet cables (Cat5/Cat5e/Cat6) for local networks and internet access
- TCP and UDP Protocol Support — Full support for both TCP (reliable connections) and UDP (fast datagrams) enables web servers, REST APIs, MQTT, email, time sync, and diverse network applications
- Micro SD Card Slot — Built-in microSD card reader provides convenient data storage for network logs, web page files, sensor data, configuration settings, and file serving capabilities
- Universal Compatibility — Works with both UNO-form factor boards (Arduino UNO R3, R4 WiFi, R4 Minima, Leonardo, Zero, DIYables STEM boards) and Mega-form factor boards (Mega 2560, Due, Giga R1 WiFi)
- Plug-and-Play Installation — Simply stack the shield directly onto Arduino boards with no soldering, breadboard, or complex wiring required—connect Ethernet cable and start coding
- Standard Ethernet Library — Compatible with Arduino's built-in Ethernet library for straightforward programming with extensive documentation, examples, and community resources
- SPI Interface — Communicates via Arduino SPI bus (pins 10-13) leaving most digital and analog pins available for sensors, displays, motors, and other components
- Low Power Consumption — Efficient W5100 chipset minimizes power draw for battery-powered or energy-conscious IoT deployments and remote sensor installations
- Auto-Negotiation — Automatic 10/100 Mbps speed detection and full/half duplex negotiation ensures compatibility with any standard Ethernet network infrastructure
- Free Online Tutorials — Comprehensive step-by-step guides, web server examples, client code, and project ideas available at arduinogetstarted.com and newbiely.com
- Versatile Applications — Ideal for IoT devices, home automation, web servers, REST API clients, network sensors, data loggers, MQTT projects, remote monitoring, industrial control systems, and STEM education
SPECIFICATION
| Specification | Value |
|---|---|
| Shield Type | Ethernet Network Shield |
| Ethernet Controller | W5100 |
| TCP/IP Stack | Hardware-based (W5100 integrated) |
| Network Protocols | TCP, UDP |
| Ethernet Port | RJ45 connector |
| Network Speed | 10/100 Mbps auto-negotiation |
| Duplex Mode | Full/Half duplex auto-negotiation |
| SD Card Slot | microSD card reader (SPI) |
| Communication Interface | SPI (Serial Peripheral Interface) |
| SPI Pins Used | Digital pins 10, 11, 12, 13 |
| Chip Select (Ethernet) | Digital pin 10 |
| Chip Select (SD Card) | Digital pin 4 |
| Designed for UNO-form factor boards | Arduino UNO R3, UNO R4 WiFi, UNO R4 Minima, Leonardo, Zero, UNO SMD, DIYables STEM V3, DIYables STEM V4 IoT |
| Also works with Mega-form factor boards | Arduino Mega 2560, Arduino Due, Arduino Giga R1 WiFi |
| Form Factor | Universal Arduino Shield |
| Stackable | Yes (with limitations on pin usage) |
| Dimensions | Standard Arduino shield size |
Library
Tested Hardware
| Board | Tested | Notes |
|---|---|---|
| Arduino Uno R3 | ✅ | Fully supported |
| Arduino Uno R4 WiFi | ✅ | Fully supported |
| Arduino Uno R4 Minima | ✅ | Fully supported |
| Arduino Mega | ✅ | Fully supported |
| DIYables STEM V3 Board | ✅ | Fully supported |
| DIYables STEM V4 IoT Board | ✅ | Fully supported |
