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Feature

High speed Ethernet controller W5100
SPI interface
32 Kbytes inner buffer
SD card slot
Compatible with Arduino UNO, Duemilanove, and Mega

Description

Description:
The latest revision of the shield also includes a reset controller, to ensure that the W5100 Ethernet module is properly reset on power-up. Previous revisions of the
shield were not compatible with the Mega and need to be manually reset after power-up. The reset button on the shield resets both the W5100 and the Arduino board.
Arduino communicates with both the W5100 and SD card using the SPI bus (through the ICSP header). This is on digital pins 11, 12, and 13 on the Duemilanove and pins 50,
51, and 52 on the Mega. On both boards, pin 10 is used to select the W5100 and pin 4 for the SD card. These pins cannot be used for general i/o. On the Mega, the hardware SS pin, 53, is not used to
select either the W5100 or the SD card, but it must be kept as an output or the SPI interface won't work.
Note that because the W5100 and SD card share the SPI bus, only one can be active at a time. If you are using both peripherals in your program, this should be taken care
of by the corresponding libraries. If you're not using one of the peripherals in your program, however, you'll need to explicitly deselect it. To do this with the SD card, set pin 4 as an output and
write a high to it. For the W5100, set digital pin 10 as a high output.

Features:
High speed Ethernet controller W5100
SPI interface
32 Kbytes inner buffer
RJ45 Ethernet port
Support up to four simultaneous TCP/UDP connections
SD card slot
Reset Switch
Compatible with Arduino UNO, Duemilanove, and Mega

Package Content: 1 pcs Ethernet Sheild Expansion Board