[TriEmbed] RPi & Port Expander Grounds

[Glen Smith]

No,

The grounds should always be tied together. Otherwise you can run into very
strange results.

Glen

On Wed, Sep 17, 2014 at 12:03 PM, Grawburg <grawburg at myglnc.com> wrote:

> Am I correct (based upon previous posts) that when I use a port expander
> with my Pi and use an external power source for the devices connected to
> the expander, I should always use the ground on the Pi. Therefore, the
> ground of an external 5 VDC is not utilized.
>
> Thanks,
> Brian
>
>
>
>
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