Arduino Board : Difference Between Two Gnd Port - Stack Overflow

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Learn more about Labs Arduino board : difference between two gnd port Ask Question Asked 12 years, 3 months ago Modified 3 years, 10 months ago Viewed 7k times 3

On Arduino board, I see two port gnd : one in power line (a list of port has power label beside), that I call gnd(1). And the one is on the other (the line that has port from 0 --> 13 and gnd), that I call gnd(2).

I don't know the difference between two port, but when I test a LED on breadboard, if one line I connect to gnd(1), the LED will be lighter than gnd(2) (gnd(2) just has a small red light)

Please explain for me the difference.

Thanks :)

• arduino
• led

Share Improve this question Follow asked Aug 17, 2012 at 11:00 hqthqt 30.2k5454 gold badges178178 silver badges253253 bronze badges 3

• Can you measure the resistance between the two? – Nicholas Albion Commented Aug 17, 2012 at 11:06
• @NicholasAlbion oh, i'm sorry, i don't have enough tools for that. – hqt Commented Aug 17, 2012 at 12:06
• Where are you getting your 5V from? What happens when you connect GND to a good ground source? – Nicholas Albion Commented Aug 18, 2012 at 13:38

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3 Answers 3

Sorted by: Reset to default Highest score (default) Trending (recent votes count more) Date modified (newest first) Date created (oldest first) 1

From reading this page: http://arduino.cc/en/Main/ArduinoBoardUno/ (if this is your board) I can't see that it should be any difference in your gnd ports. Maybe you provide different amount of power? Or do you have too much resistance at one time?

I have used Arduino pretty much and I've never had your issue even if I am using all gnd ports available.

Share Improve this answer Follow answered Aug 17, 2012 at 11:06 Ms01Ms01 4,6621111 gold badges5050 silver badges8282 bronze badges 2

• Does that mean the 2 GND ports are exactly the same and can be used interchangeably? – BBB Commented Feb 19, 2013 at 19:17
• Yes I think so anyway. But to know for sure you should raise a question on the arduino forum or read the documentation for your device. – Ms01 Commented Feb 19, 2013 at 20:18

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The ground connections are usually directly connected on the board. In my opinion there are at least two good reasons for this design:

1) Ground connections are needed very often. Thus it is convenient to have as many ground connections as possible. Especially if you are experimenting with jumper wires.

2) Ground connections are very important and should be reliable. Thus redundant connections will improve reliability in case of vibrations and or bumps.

Share Improve this answer Follow answered May 12, 2013 at 6:51 Udo KleinUdo Klein 6,88211 gold badge3838 silver badges6262 bronze badges Add a comment | 1

In my experience adding an extra GND to my breadboard greatly increases reliability and stability. I have had the same experience of LED turning brighter, but also of digital results becoming unreliable if i'am only using one GND.

I tried fixing my stability issues by adding capacitors to the breadboard, but adding an extra GND was much more effective.

Share Improve this answer Follow answered Apr 2, 2014 at 11:52 user3279555user3279555 1111 bronze badge Add a comment |

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