Arduino Ethernet Shield connects your Arduino to the internet in mere minutes.
Just plug this module onto your Arduino board, connect it to your network with
an RJ45 cable (not included) and follow a few simple instructions to
start controlling your world through the internet. As always with Arduino,
every element of the platform – hardware, software and documentation – is
freely available and open-source. This means you can learn exactly how it's
made and use its design as the starting point for your own circuits. Hundreds
of thousands of Arduino boards are already fueling people’s creativity all over
the world, every day. The
Arduino Ethernet Shield allows an Arduino Board to connect to the internet. It
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. 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 to.