It’s good practice to add resistors to all data lines except Data 1 which has a resistor built in to it already. The whole issue of data line resistors is discussed in more detail here:
This is kind of a back-to-basics thing, but working on a tight install with lots of pixel accents, it’s occurred to me to ask the question - are data line resistors really necessary?
My understanding is that they are there to clean up noise on the data line, which presumably prevents data being corrupted or misinterpreted by the pixels. In an appliance with long wire runs, this makes sense to me, but wire runs in a hilt are very short, which begs the question, can noise really be induced in such a short wire run to the extent that it materially affects functionality?
I guess these days this mostly applies to accents and not main blades, as many neopixel blade connectors have built-in data resistors. And of course Proffie Data 1 is pre-resistored in any case (hence I often use data 1 for accents and data 2, 3 or 4 for main blades).
So does anyone here routinely not bother with resistors on accent pixel data lines using pads 2, 3 and 4? If so, do you suffer any ill effects? Is there any particular thing you have to watch for when omitting them? I did a quick search but couldn’t find anything about the science of it all.
Just curious really.