Hi,
Well tell us what the project is?
If we don't know what your project entails then how can we give information that will prove helpful to you.
Is it automotive related?
Is it industrial control related?
It it drone related?
The participants in this forum have varied skills and resources, for you to use those efficiently so as to use peoples time efficiently and got get accurate information, we need to know what your application is.
If it is commercial and of a sensitive nature, from what I can surmise, you do not appear to have the knowledge or experience in electronics and control to even attempt the any electronic or control project.
Sorry but we are up to post #42 and have no idea what your application, or your skills are?
Can you please tell us your electronics, programming, arduino, hardware experience?
Tom... 
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You start with a design (you have it in your mind but we're not mind readers); that will tell you how many 5V/GND you will use at most; see e.g. post #17 by @groundFungus.
Also be aware that a Nano has limited power capabilities (it's not a power supply).
So why don't you share it? You have been given some advise but happily seem to ignore it.
what do you think you are doing?Guy is asking a simple question and you are trying to insult him.Really,its just better for you to not to write 
He has sussed out that this poster is jerking us about. He is not cooperating in any way. The question he is asking is so simple yet the OP says he knows what he is doing. He is a troll and has got us running about in circles just wasting our time.
If the OP were genuine then he would not claim he knows what he is doing and then go on with answers that prove he doesn’t.
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