Error in documentation for ArduinoEthernetShield

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1

Hello

On the https://www.arduino.cc/en/Main/ArduinoEthernetShield page it reads

Arduino communicates with both the W5100 and SD card using the SPI bus (through the ICSP header). This is on digital pins 10, 11, 12, and 13 on the Uno

This is not true.

The ArduinoEthernetShield uses pin 10 and the SPI bus at the bottom of the board.

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The SPI breakout at the bottom of the board is not connected to pin 11-13 on the ArduinoEthernetShield. They are connected to each other on the Arduino but not on the ArduinoEthernetShield.

I ran into this problem when connecting a non Arduino board (esp8266) to the ArduinoEthernetShield. Documentation can be found here ESP8266-12E with Ethernet lib (w5100) or enc28j60 · Issue #962 · esp8266/Arduino · GitHub

I suggest that the ArduinoEthernetShield page be update to reflect that the pin 11-13 are not used on the ArduinoEthernetShield and instead it uses the SPI break out at the bottom of the board.

2

I think the arduino pin 13 is used in some type of timing function by the ethernet shield. I've got some client code that causes pin 13 LED to illuminate.