This might sound stupid but...

Hey guys.

Sorry if this is a really nooby question but I was just wondering if it was ok to connect both of my ground pins together on my Arduino nano and my Teensy. Thanks!

It's safe to do so, but if they are on the same computer they are already connected through the USB cables.

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Thanks :slight_smile:

While the ground potential is the same for both, you need to make sure you don't mix 5v and 3v pins without level shifting