Hello everyone,
will the wiring work like this? I am only concerned with the wiring of the LEDs.
The LEDs are to be operated with +5V from an ESP32.
The DataIn is also connected from the ESP32.
And, have I not considered/forgotten anything important?
LEDs: WS2812B
Cx: 0,1uF 104 bypass-capacitor
Looks reasonable, although you probably want to make sure the power traces are beefier than the data lines. That setup could draw up to 3W in worst case terms → 0.6A on the 5V line.
You’d want to design your power lines to be 1A capable without drops. Not exactly a huge deal, but worth looking at now rather than later.
I’d also consider adding a set of “Exit pads” with at least ground and DO signals. That would give you the option of daisy chaining multiple boards, if required in the future.
There are easily found PCB trace width calculators on the Web. 1A is quite modest.
I notice it goes up to 11. Very nice.
you can just flood-fill the right side with + and the rest with GND and be done. that is the proper way.
Thank you very much for your valuable answers.
@divsys I have now looked into it. That was new to me and is really interesting and important to know. Thank you very much for that.
But I’m still unsure which thickness would be enough for me. It depends on the copper thickness, which is 1oz standard, and how hot the conductor track gets. I really can’t estimate the heat. However, I have come to the conclusion that the conductor track should be 1 mm thick. But I’m very unsure about that.
If I go by the table, it’s probably too thick?!
here
@dedehai I’m not sure how specifically you mean that.
I just did as I thought.
I only drew it for +5V at first.
You’re probably good at that size.
For temp estimation with those calculators you set the max temp you want to see as in temp rise over ambient - so 35C would mean a 10 degree rise over “standard” 25C room temperature.
As @dedehai mentioned, you’re better off to add the DO trace at top (don’t see it connected to DO on the last LED), then fill the 5V trace on right to 5mm (or even the board edge). For Gnd, “Flood fill” means put ground every where there’s no other trace. That “fills” copper everywhere you have bare board and connects it all to ground.
What PCB software are you using?
They will have that function.
@divsys Now it’s getting a bit too complex for me. But it’s probably not that tragic, is it? I mean with flood filling…
I use EasyEDA in the web browser.
Edit:
I think i can handle this. This is what u ment:
Is that good or should I change something else?
exactly like that.
not familiar with easyEDA but any decent software (which it looks like) allows flood fills to be assigned to any net (and you can set priorities for filling order if the overlap). so instead of having that fat 5V trace (which is also fine btw) you could add a 5V flood fill as well on the right side (and flood the rest including the bottom side with GND)
