Any of those choices are fine.
On Tue, Oct 16, 2018 at 11:22 AM Mega Samples via USRP-users <
usrp-users@lists.ettus.com> wrote:
> Hi USRP-users,
>
> I have an X300. I am trying to connect an external circuit to GPIO pin 2
> ("data[0]" on the pinout). What is a good pin to use for ground -- pin 14
> or 15, which are labelled "0V"? Or the shell of the DB15 connector?
>
> Thanks in advance,
> Mike
>
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