About Arduino Ethernet Shield v1 and Arduino Ethernet Shield v2

This post is a quick overview of Arduino Ethernet Shield v1 and Arduino Ethernet Shield v2.

Arduino Ethernet Shield v1

Source: https://www.arduino.cc/en/Main/ArduinoEthernetShieldV1

Ethernet Controller: Wiznet W5100 with internal 16K buffer

Interface to Arduino: Arduino communicates with both the W5500 and SD card using the SPI bus (through the ICSP header). This is on digital pins 10, 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 W5500 and pin 4 for the SD card.

Arduino Library: Ethernet.h

Production Status: this product is currently retired and the documentation will not be kept up-to-date

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Arduino Ethernet Shield v2

Source: https://www.arduino.cc/en/Main/ArduinoEthernetShieldV2

Ethernet Controller: Wiznet W5500 with internal 32K buffer

Interface to Arduino: Arduino communicates with both the W5500 and SD card using the SPI bus (through the ICSP header). This is on digital pins 10, 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 W5500 and pin 4 for the SD card.

Arduino Library: Ethernet2.h

Production Status: In production.