The Arduino Wiznet Ethernet W5100 Shield allows an Arduino board to connect to the internet. It is based on the Wiznet W5100 ethernet chip providing a network (IP) stack capable of both TCP and UDP. The Arduino Ethernet Shield supports up to four simultaneous socket connections.
The onboard micro-SD card slot can store files for serving over the network. It is compatible with Arduino Uno and Mega (using the Ethernet library). You can access the onboard SD card slot using the SD library, which is included in the current Arduino build.
Arduino communicates with the W5100 and SD card using the SPI bus (through the ICSP header). This is on digital pins 11, 12, and 13 on the Uno 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 shares the SPI bus, only one can be active simultaneously. 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 deselect it explicitly. To do this with the SD card, set pin 4 as an output and write a high. For the W5100, set digital pin 10 as a high output.
The shield provides a standard RJ45 ethernet jack. Requires an Arduino Board (not included)
Compatible with the Arduino line of products. Trademark registrations throughout the world for ARDUINO or Arduino® are owned by: Arduino AG and Arduino SA.
- Operating voltage 5V (supplied from the Arduino Board)
- Ethernet Controller: W5500 with internal 32K buffer
- Connection speed: 10/100Mb
- Connection with Arduino on SPI port