The Arduino Ethernet shield allows an Arduino board to connect to the internet (LAN) using the Ethernet library.
This is the latest version.
Available features:
- Micro-SD card connector
- On board reset controller
- Compatible with the Arduino UNO, Arduino
- Duemilanove and Mega
- NOW Compatible with the PoE Module.
Introduction at Arduino site: http://arduino.cc/en/Main/ArduinoEthernetShield
Ethernet Shield is based on the Wiznet W5100 ethernet chip. The Wiznet W5100 provides a network (IP) 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. 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. The shield provides a standard RJ45 ethernet jack.