so that there a 2 wires rather than 3 to connect between the two for purposes of serial communication. And the same question for 3 arduino megas on a common rail and using serial connections?
Add a comment
|
1 Answer
All voltages are ground referenced, hence the ground is the only (supply) connection required. Remote modules can be self-powered and signals will still be discriminated as long as ground is connected.
answered Mar 24, 2015 at 15:24
-
thank you for your prompt reply , the 9v and negative rail are connected for purposes of powering the arduino boards anyway. I should have asked Do I need an additional connection between the grounds to that provided by the power connection.– wobblerCommented Mar 24, 2015 at 15:35
-
If they're using a common ground then their grounds should be already connected. Commented Mar 24, 2015 at 15:36