Setting Up Board Layers

Thought for 18 sec

What you should do is treat 0.25 mm as your default trace width, enforce 0.15 mm as the minimum only where you truly need to escape fine-pitch pins, and create a separate wider rule for power nets at 0.5 mm. Flux’s trace-width docs explicitly support adding Trace Width, Trace Width Minimum, and related net/trace rules in the Layout Rules area

Practical setup

Table

Rule	Value	Use
Default `Trace Width`	0.25 mm	Normal signal routing
Default `Trace Width Minimum`	0.15 mm	Fine-pitch escape only
Power-net `Trace Width`	0.5 mm	Battery, charger, regulator outputs, main supply rails

How to think about it

0.25 mm default: good beginner-friendly general signal width.
0.15 mm minimum: not your target everywhere, just the narrowest allowed when routing gets tight around IC pins.
0.5 mm for power: use on rails that actually carry meaningful current, especially battery and regulator paths.

In your current Flux view

Since you see:

Layout default rule
Trace default rule

I’d do this:

Step 1

Open Trace default rule and set:

Trace Width = 0.25 mm
Trace Width Minimum = 0.15 mm

That gives you a sane global baseline using the documented trace-width rule flow

Step 2

For power, don’t try to force the whole board’s default trace width to 0.5 mm. Instead, add a more specific rule for power nets. Flux’s layout workflow is rule-driven and supports selector-based / target-specific rule application rather than only one board-wide width

What if you don’t know how to target power nets yet?

Then for now:

set the global trace defaults to 0.25 / 0.15 mm
remember to manually make important power traces wider later
once your nets exist, create a dedicated rule for nets like:
- VBAT
- USB_5V
- regulator outputs
- main 3V3 rails

Best fit for your EEG board

Table

Net type	Recommended width
Fine-pitch IC escape	0.15 mm
Normal digital/control/sensor signals	0.25 mm
General power rails	0.5 mm
Sensitive EEG analog inputs	Keep short first; width is less important than shielding/return path

My recommendation

Set this now:

Trace default width = 0.25 mm
Trace default minimum = 0.15 mm

Then later add:

Power-net trace width = 0.5 mm

If you want, I can help you write the exact next rule for power once you tell me what options appear when you click Add under rules.

ninaphatak

How do I create multiple schematic sheets in this project and connect them with ports?

Thought for 27 sec

flux

This is the most relevant entry I found related to the topic:

Does Flux support multi-sheet schematics or reusable sub-circuits?
Flux uses a single-sheet schematic approach. However, you can section your schematic or create Modules—reusable sub-circuits that encapsulate part of your design.
How can I label nets or create named connections in the schematic?
Use net portals by placing a portal symbol on a wire and entering the desired net name. Any portal sharing that name will automatically connect the nets. Learn more in the Schematic – Net Portals guide.

Source

Show module docs

Net portals steps

Module vs portals

Files

Schematic

Layout

3D View

FlowState Headband EVT1