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Topic: UNO Ethernet Reserved Pins (Read 577 times) previous topic - next topic

joel2600

I wasn't sure where to post this, so I hope this works.

I've got an UNO Ethernet, and I know that pins 10-13 are reserved and can't be used for I/O, but what about pin 4?

Pin 4 is reserved for the SD card... but what if I don't want to use the SD card?  Can I use pin 4 for I/O?

I can't seem to find anything telling me that I can't use pin 4. 

Anyone know?

fat16lib

You can use pin 4 for I/O if there is no SD in the socket.  Pin 4 is only connected to the high-Z input of a level shifter IC. 

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