🌐 Ethernet Shield Wiznet W5100

The Ethernet Shield based on the Wiznet W5100 chip allows your Arduino board to connect to the internet quickly and easily. Fully compatible with the official Arduino Ethernet Shield, it supports all the same libraries and example codes.

Simply stack the shield onto your Arduino, connect an RJ45 cable, and follow a few basic steps to control your Arduino remotely via the internet.

⚙️ Key Features

• 🔌 Wiznet W5100 Chip: Supports TCP and UDP protocols
• 🌍 Internet Connectivity: Connects Arduino to the internet via Ethernet
• 🔄 Multiple Connections: Supports up to 4 simultaneous socket connections
• 💾 SD Card Slot: Read and write data using the SD library (SS pin: D4)
• 🧩 Compatible: Works seamlessly with Arduino UNO and MEGA boards

🧠 SPI Communication Details

• 📡 Shared SPI Bus: W5100 and SD card communicate over SPI
• ⚠️ Important Note: Only one device (W5100 or SD card) can be active at a time
• 📌 Chip Select Pins: Pin 10 for W5100, Pin 4 for SD card
• 🔧 For Arduino UNO: SPI pins are 11, 12, 13
• 🔧 For Arduino MEGA: SPI pins are 50, 51, 52; SS pin is 53 (must be set as output)

📦 Additional Notes

• 📁 SD Card Use: To deactivate SD, set pin 4 as output and HIGH
• 📡 W5100 Use: To deactivate W5100, set pin 10 as output and HIGH
• ⚙️ PoE Version: A PoE-enabled version of this shield is also available

✅ Perfect for IoT projects, web-controlled devices, and remote data logging applications with Arduino.