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Arduino Ground Pin
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Arduino Ground Pin

by rellik on Sat Aug 27, 2011 10:37 am

This is probably basic :)

I am a little confused about the ground pin on the arduino. Normally, you use it to provide a reference voltage to your project. When you connect it to another source of ground [1], though, they somehow form a common ground, though they both individually provide (presumably) slightly different reference points. How does this work? Does it average out? Since (in the referenced image) the ground is used for reference from the data/clock lines, I'd expect you'd want to only use the arduino's reference point.

I'm sure there is some basic concept I'm not understanding here, any pointers would be appreciated :)

Thanks,
Patrick

[1] As shown here: http://www.ladyada.net/images/digitalle ... rduino.gif
rellik
 
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Re: Arduino Ground Pin

by len17 on Sat Aug 27, 2011 10:53 am

The basic concept is that if two points are connected by a wire, there won't be any voltage difference between them. The electrons "fill up" the wire evenly. So a common ground provides a common voltage reference for all parts of the circuit.

len17
 
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Please be positive and constructive with your questions and comments.