Hello all, Before I start writing code for things, I wanted to make sure there is nothing wrong with it. I have an Arduino Ethernet which I'm using pretty much all the available I/O pins on. I stayed away from digital pins 0,1,4,10-13 because they have special purposes. I am using analog pins 0-5 …

Arduino Ethernet - not using SD, can I use pin 4 for an I/O?

johnwasser April 12, 2014, 1:17am 2

You can use Pin 4 for I/O as long as there is no SD card in the SD socket.

1 Like