Ethernet Shield W5100

The Ethernet Shield W5100 connects an Arduino Uno or Mega to a wired network and the internet through a standard RJ45 cable. It uses the WIZnet W5100 Ethernet controller, which handles the TCP/IP stack in hardware, so your sketch only has to send and receive data. A microSD card slot on the shield lets you store files such as web pages or logged data.

Ethernet Shield W5100 Specifications

• Controller: WIZnet W5100 with hardwired TCP/IP stack
• Network speed: 10/100 Mbps Ethernet, RJ45 connector
• Protocols: TCP, UDP, IPv4, ICMP, ARP
• Connections: up to 4 sockets at the same time
• Buffer: 16 KB internal memory
• Interface: SPI; digital pin 10 selects the W5100 and pin 4 selects the SD card
• Storage: microSD card slot (card not included)
• Compatible boards: Arduino Uno, Mega 2560 and other boards with the standard shield layout

Ethernet Shield W5100 Applications

• Small web servers and control pages hosted on an Arduino
• Sending sensor data to a server, MQTT broker or cloud dashboard
• Remote switching of relays over a local network
• Data logging to the microSD card

What's in the Box

• 1 × W5100 Ethernet shield

Tip: Use the built-in Arduino Ethernet library. On the Uno, pins 10 to 13 are used for SPI, so avoid them for other parts; if you are not using the SD card, set pin 4 HIGH so it does not interfere.

Orders placed before 14:00 are ready for pickup the same day. Delivery across Lebanon usually takes 1–3 working days.