Arduino Ethernet Shield W5100 Expansion Board with micro SD slot

This Ethernet Shield which is based on the Wiznet W5100 Ethernet Chip gives you an easy way to get your for Arduino Online. It is directly supported by for Arduino official Ethernet Library. It adds a micro-SD card slot, which can be used to store files for serving over the network. It is compatible with the for Arduino Duemilanove (168 or 328), Uno as well as Mega (1280/2560) and can be accessed using the SD library.


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 shield contains a number of informational LEDs:

• PWR: indicates that the board and shield are powered
• LINK: indicates the presence of a network link and flashes when the shield transmits or receives data
• FULLD: indicates that the network connection is full duplex
• 100M: indicates the presence of a 100 Mb/s network connection (as opposed to 10 Mb/s)
• RX: flashes when the shield receives data
• TX: flashes when the shield sends data
• COLL: flashes when network collisions are detected Compatibility

Working with: Arduino Uno, Arduino Mega, Arduino Duemilanove.