I'm a newby in the field of Electrical Engineering (only basic knowledge from school). Nevertheless, I need to power up to 10 Raspberry Pis (5V, 2A) with Dupont Connectors and AWG24 cables over GPIO header. I have a power supply unit giving me max 30A at 5V.

My question is, can I just etch e.g. two lanes on a PCB and solder a Dupont header (10 by 2) with 10 output pairs (each for one device) to them and powering those lanes at the end with one input pair coming from the psu (with stronger wire gauges, maybe AWG18)? Of course I would apply solder masking, to prevent short circuits and oxidation.

This seems a bit naive, so I'm asking your opinion. Maybe you are aware of other neat solutions?

  • \$\begingroup\$ Does your project require a PCB here? Why not use 2 bus bars instead, 1 for 5V 1 for GND? They're cheap and won't require any designing. Like these: dropbox.com/… \$\endgroup\$ – Jim Aug 1 '19 at 13:34
  • \$\begingroup\$ If you do a two-lane PCB, add some reservoir capacitors to this PCB as well (of considerable capacity). \$\endgroup\$ – glen_geek Aug 1 '19 at 13:56
  • \$\begingroup\$ @Jim thanks for your comment. Yes, I've seen those already and it doesn't require a PCB. I'm just wondering if the resistance of those bus bars has a negative impact on the voltage? \$\endgroup\$ – m0r0n Aug 1 '19 at 13:59
  • \$\begingroup\$ @glen_geek thanks also for your comment. Speaking about capacitors, what would I look at here? Do you have any good resource for me to read about this? What would you consider a "considerable capacity" in this case and for what reason? \$\endgroup\$ – m0r0n Aug 1 '19 at 14:01
  • \$\begingroup\$ Why only 10x2? GPIO is 20x2. Connect all 8 GND and both +5v… that would make your PCB 10-lane. If you expect one RPI to communicate via GPIO to another, they all must have a solid, unvarying ground reference. Most RPI versions have many microfarads on-board capacitance on their +5V inputs. If you include capacitors on your DCsupply distribution board, they should be even larger, like 470uf or 1000uf. \$\endgroup\$ – glen_geek Aug 1 '19 at 15:02

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