The W5100 Ethernet Shield adds wired network connectivity to compatible Arduino boards through a standard RJ45 connection. Its WIZnet W5100 controller provides a hardware TCP/IP stack for TCP and UDP projects and communicates with the host board over SPI.
Key specifications
Operating supply: 5V from the compatible Arduino board
Ethernet controller: W5100 with a listed 16KB internal buffer
Listed network speed: 10/100Mb
SPI communication with the host controller
Support for up to four simultaneous TCP or UDP sockets
Onboard microSD card slot for compatible storage projects
Status LEDs for power, link and network activity
Common applications
Arduino web-server and client experiments
Wired sensor monitoring
Local-network automation
microSD-backed data logging
SPI and compatibility guidance
The Ethernet controller and microSD slot share the SPI bus and normally use separate chip-select pins. Deselect the unused device in software to prevent bus conflicts. Confirm the pin mapping for the connected UNO or Mega-compatible board and the supplied shield revision.
What does the W5100 Ethernet Shield add to Arduino?
It adds wired 10/100 Ethernet networking through the WIZnet W5100 controller.
Which interface does the W5100 shield use?
The shield communicates with Arduino over SPI. Its Ethernet controller and microSD slot may use separate chip-select pins on the same SPI bus.
Does the Ethernet Shield include wireless WiFi?
No. The W5100 provides wired Ethernet through an RJ45 network connection; it is not a WiFi module.
Can the W5100 shield use a microSD card?
Yes. The listed shield includes a microSD slot. The card and Ethernet controller share the SPI bus, so their chip-select pins must be controlled correctly.
How is the W5100 Ethernet Shield powered?
The listing specifies 5V operation supplied through a compatible Arduino board. Confirm shield alignment and pin compatibility before applying power.
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