I'm looking for a complete pinout of the Arduino Ethernet R3. I've found one here which is low quality, and seems not complete (where are the digital I/O pins?).
BTW, it was not a good idea for Arduino to name this board "Arduino Ethernet", as this is pretty useless for searching online :-(
That's a better one from :
https://pinoutguide.com/images/arduino/ethernet.png
This one also presents the Arduino Ethernet R3 board and has the extra I2C pins (SCK=A5,SDA=A4) next to the AREF pin.
The formal Arduino.cc website mentions, somewhat obscurely, that the Arduino Ethernet is pin compatible with Arduino Uno:
The Revision 3 of the board introduces the standardized 1.0 pinout
Except for pins 10-13:
Pins 10, 11, 12 and 13 are reserved for interfacing with the Ethernet module and should not be used otherwise. This reduces the number of available pins to 9, with 4 available as PWM outputs.
The other difference is the onboard LED is connected to pin 9 rather than the Uno's pin 13:
On most other arduino boards, this LED is found on pin 13. It is on pin 9 on the Ethernet board because pin 13 is used as part of the SPI connection.
You can use any Arduino Uno pinout diagram as a reference, the one you have found seems to be pretty elaborated.
