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Topic: Soldering/Wirering question (Read 543 times) previous topic - next topic

asuryan

Nov 19, 2011, 03:46 pm Last Edit: Nov 19, 2011, 03:48 pm by asuryan Reason: 1
Dear Arduino-Community!

I have a question regarding soldering/wiring my first complex arduino project
for standalone use.

1. Is there any difference in soldering the two scenarios electronicly?
2. Is this the same when its not GND but Vcc?



Because using the left approach will reduce the hassle with all the wires underneath my
board. Is it possible to solder that way?



elemakil

There is no difference; either version works. Also there's no difference when connecting it to VCC or any other voltage whatsoever.

All points in a connected line are at the same potential (which is the important factor for a voltage).

asuryan


Grumpy_Mike

Quote
There is no difference; either version works.

That is not strictly true. It depends on the amount of current being carried and also on what the two grounds on the IC actually are.
If the further ground has large currents flowing then the left hand circuit can cause "ground bounce". If the two grounds are analogue and digital grounds then for less noise in the circuit you are better off using the right hand circuit and having a "star ground" configuration.

However for general purpose use the left hand circuit is fine.

elemakil

@Grumpy_Mike: That is true. Also if those connections are too long we'd have some noise from electromagnetic induction and of course a slight decrease in the potential (and therefore the voltage).
But I guess we're talking about an ordinary and small circuit for an electronics starter and therefore it doesn't matter; either way works!

dc42

Mostly, it makes no difference; but there are exceptions, for example:

- if one of the ground or VCC pins is carrying high currents that are being switched rapidly (e.g. PWMing a motor or a lot of LEDs)

- if one of the grounds is the Agnd or Avcc pin of an atmega328 or similar chip

In these cases, the varying current flow to/from one of the pins can induce enough voltage in the common wire to affect the other one.
Formal verification of safety-critical software, software development, and electronic design and prototyping. See http://www.eschertech.com. Please do not ask for unpaid help via PM, use the forum.

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