W5100 Arduino Uno R3 Ethernet Network Expansion Board

Arduino Ethernet Shield R3 allows an Arduino board to connect to the internet. It is based on the Wiznet W5100 ethernet chip. The Wiznet W5100 provides a network stack capable of both TCP and UDP. It supports up to four simultaneous socket connections. Use the Ethernet library to write sketches which connect to the internet using the shield.
The new Ethernet shield now includes a micro SD card connector, it is Arduino Mega compatible and has an on-board reset controller.
The ethernet shield connects to an Arduino board using long wire-wrap headers which extend through the shield. This keeps the pin layout intact and allows another shield to be stacked on top.
Arduino uses digital pins 10, 11, 12, and 13 (SPI) to communicate with the W5100 on the ethernet shield. These pins cannot be used for general i/o.


Specifications

Wiznet W5100 Chip
IEEE802.3af compliant
Connection with Arduino on SPI port
Operating Voltage: 5V
Ethernet Controller: W5100 with internal 16K buffer
Connection speed: 10/100 Mb
Dimensions: 73mm x 54mm x 17mm
Weight: 26g