Pages: [1]   Go Down
Author Topic: UNO Ethernet Reserved Pins  (Read 522 times)
0 Members and 1 Guest are viewing this topic.
Iceland
Offline Offline
Newbie
*
Karma: 0
Posts: 3
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

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?
Logged

0
Offline Offline
Edison Member
*
Karma: 67
Posts: 1654
Arduino rocks
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

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. 
Logged

Pages: [1]   Go Up
Jump to: