Hi, According to the official information about the Ethernet shield pin 4 is used for the SD-card reader. I'm wondering if I will be able to use this pin if I don't need any SD-functions? Because I'll be needing in for its interrupt function (I'll need both interrupt pins for my project).

Can i use pin 4 on the new Ethernet shield?

johnwasser September 5, 2012, 10:48pm 2

If you don't install an SD card you can use Pin 4 any way you like.

Note that the external interrupts are on Pin 2 and Pin 3.

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