Is it possible / recommended to solder more than one wire to the 3.3v pad on a Proffie 3.9 board? One would be to the switch pcb of a KR Saber Luke Eco Hero, and the other would be to a 5-pixel strip that will be attached to the back of the proffie board.
Sure, why not?
3.3v is low for a pixel strip.
Generally, pixel strips should be powered with battery power.
That’s what I thought. I was just trying to figure out how to avoid having to run 4 wires from the positive battery terminal.
The small stuff, like the 5-pixel strip, can use smaller wires and be spliced in anywhere.
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Ah, got it. Thanks Prof!
I am running dual positive 22awg, dual negative 22awg, and a single 28awg wire between the npxl boards in the thin neck. Does that also mean I should run two positive 22awg from the battery to the inner npxl connector as well as two negatives from the battery to the proffie board?
Assuming you’re running 2x22 because you need that, then yes, you should complete the full loop from battery positve to battery negative using 2x22.
If you don’t actually need 2x22, you’re just doing because you want to keep resistance low, or because of good old-fashioned paranoia, then you can do whatever you like.
Also, there is no one simple rule for what gauge wire you need, it’s simply a matter of how much waste heat you’re willing to tolerate, everything else is just a recommendation.
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If you are running dual 22awg, many like to use the NPXL PCB positive terminals for small stuff, like crystal chamber and such. 5 Neopixels, assuming a 5050, are at most 65mA. Which even a 40awg wire can handle. Another option is, if you have a killswitch or on/off switch, to wire those to the positive in. As long as you take the positive before the killsiwitch or on/off, you can splice it from there.