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.
You 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 top.
There is an onboard micro-SD card slot, which can be used to store files for serving over the network. It is compatible with the Arduino Uno and Mega (using the Ethernet library). The onboard micro-SD card reader is accessible through the SD Library. When working with this library, SS is on Pin 4.
The shield also includes a reset controller, to ensure that the W5500 Ethernet module is properly reset on power-up. The most recent revision of the board exposes the 1.0 pinout on rev 3 of the Arduino UNO Board. The Ethernet Shield 2 has a standard RJ-45 connection, with an integrated line transformer and Power over Ethernet enabled. This shield also features several TinkerKit input/output and communication interfaces that can be found on the topside of the board.
Features & Specifications
- Operating voltage 5V (supplied from the Arduino Board)
- Ethernet Controller: W5500 with internal 32K buffer
- 2x TinkerKit Inputs, Outputs, and TWI Pins Each
- Connection speed: 10/100Mb
- Connection with Arduino on SPI port