Setting Up Board Layers
0:18
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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 areaPractical setup
| 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 |
- 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.
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 mmTrace 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:
VBATUSB_5V- regulator outputs
- main 3V3 rails
Best fit for your EEG board
| 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 |
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.
4 days
How do I create multiple schematic sheets in this project and connect them with ports?
4 days
0:27
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Layout
Reading docs about How do I create multiple schematic sheets in Flux and connect them using ports or net portals between sheets?.
Reading docs about How do net portals work in Flux for connecting signals across modules or multiple schematic sheets?.
Gathering compliance guidance.
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.
Show module docs
Net portals steps
Module vs portals
4 days
Ready.
U2
U4
U3
U1
Reviews
- Wirelessly connects nets on schematic. Used to organize schematics and separate functional blocks. To wirelessly connect net portals, give them same designator. #portaljharwinbarrozo43.0M
- Wirelessly connects power nets on schematic. Identical to the net portal, but with a power symbol. Used to organize schematics and separate functional blocks. To wirelessly connect power net portals, give them the same designator. #portal #powerjharwinbarrozo11.4M
- A generic fixed resistor for rapid developing circuit topology. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard resistor values: 1.0Ω 10Ω 100Ω 1.0kΩ 10kΩ 100kΩ 1.0MΩ 1.1Ω 11Ω 110Ω 1.1kΩ 11kΩ 110kΩ 1.1MΩ 1.2Ω 12Ω 120Ω 1.2kΩ 12kΩ 120kΩ 1.2MΩ 1.3Ω 13Ω 130Ω 1.3kΩ 13kΩ 130kΩ 1.3MΩ 1.5Ω 15Ω 150Ω 1.5kΩ 15kΩ 150kΩ 1.5MΩ 1.6Ω 16Ω 160Ω 1.6kΩ 16kΩ 160kΩ 1.6MΩ 1.8Ω 18Ω 180Ω 1.8KΩ 18kΩ 180kΩ 1.8MΩ 2.0Ω 20Ω 200Ω 2.0kΩ 20kΩ 200kΩ 2.0MΩ 2.2Ω 22Ω 220Ω 2.2kΩ 22kΩ 220kΩ 2.2MΩ 2.4Ω 24Ω 240Ω 2.4kΩ 24kΩ 240kΩ 2.4MΩ 2.7Ω 27Ω 270Ω 2.7kΩ 27kΩ 270kΩ 2.7MΩ 3.0Ω 30Ω 300Ω 3.0KΩ 30KΩ 300KΩ 3.0MΩ 3.3Ω 33Ω 330Ω 3.3kΩ 33kΩ 330kΩ 3.3MΩ 3.6Ω 36Ω 360Ω 3.6kΩ 36kΩ 360kΩ 3.6MΩ 3.9Ω 39Ω 390Ω 3.9kΩ 39kΩ 390kΩ 3.9MΩ 4.3Ω 43Ω 430Ω 4.3kΩ 43KΩ 430KΩ 4.3MΩ 4.7Ω 47Ω 470Ω 4.7kΩ 47kΩ 470kΩ 4.7MΩ 5.1Ω 51Ω 510Ω 5.1kΩ 51kΩ 510kΩ 5.1MΩ 5.6Ω 56Ω 560Ω 5.6kΩ 56kΩ 560kΩ 5.6MΩ 6.2Ω 62Ω 620Ω 6.2kΩ 62KΩ 620KΩ 6.2MΩ 6.8Ω 68Ω 680Ω 6.8kΩ 68kΩ 680kΩ 6.8MΩ 7.5Ω 75Ω 750Ω 7.5kΩ 75kΩ 750kΩ 7.5MΩ 8.2Ω 82Ω 820Ω 8.2kΩ 82kΩ 820kΩ 8.2MΩ 9.1Ω 91Ω 910Ω 9.1kΩ 91kΩ 910kΩ 9.1MΩ #generics #CommonPartsLibraryjharwinbarrozo1.5M
- A generic fixed capacitor ideal for rapid circuit topology development. You can choose between polarized and non-polarized types, its symbol and the footprint will automatically adapt based on your selection. Supported options include standard SMD sizes for ceramic capacitors (e.g., 0402, 0603, 0805), SMD sizes for aluminum electrolytic capacitors, and through-hole footprints for polarized capacitors. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard capacitor values: 1.0pF 10pF 100pF 1000pF 0.01uF 0.1uF 1.0uF 10uF 100uF 1000uF 10,000uF 1.1pF 11pF 110pF 1100pF 1.2pF 12pF 120pF 1200pF 1.3pF 13pF 130pF 1300pF 1.5pF 15pF 150pF 1500pF 0.015uF 0.15uF 1.5uF 15uF 150uF 1500uF 1.6pF 16pF 160pF 1600pF 1.8pF 18pF 180pF 1800pF 2.0pF 20pF 200pF 2000pF 2.2pF 22pF 20pF 2200pF 0.022uF 0.22uF 2.2uF 22uF 220uF 2200uF 2.4pF 24pF 240pF 2400pF 2.7pF 27pF 270pF 2700pF 3.0pF 30pF 300pF 3000pF 3.3pF 33pF 330pF 3300pF 0.033uF 0.33uF 3.3uF 33uF 330uF 3300uF 3.6pF 36pF 360pF 3600pF 3.9pF 39pF 390pF 3900pF 4.3pF 43pF 430pF 4300pF 4.7pF 47pF 470pF 4700pF 0.047uF 0.47uF 4.7uF 47uF 470uF 4700uF 5.1pF 51pF 510pF 5100pF 5.6pF 56pF 560pF 5600pF 6.2pF 62pF 620pF 6200pF 6.8pF 68pF 680pF 6800pF 0.068uF 0.68uF 6.8uF 68uF 680uF 6800uF 7.5pF 75pF 750pF 7500pF 8.2pF 82pF 820pF 8200pF 9.1pF 91pF 910pF 9100pF #generics #CommonPartsLibraryjharwinbarrozo1.5M
- A generic fixed inductor for rapid developing circuit topology. *You can now change the footprint and 3D model at the top level anytime you want. This is the power of #genericsjharwinbarrozo15.6k
- An electrical connector acting as reusable interface to a conductor and creating a point where external circuits can be connected.Terminal
- 47 kOhms ±5% 0.125W, 1/8W Chip Resistor 0805 (2012 Metric) Automotive AEC-Q200 Thick Film #forLedBlinkjharwinbarrozo1.2M
- 10uF Capacitor Aluminum Polymer 20% 16V SMD 5x5.3mm #forLedBlink #commonpartslibrary #capacitor #aluminumpolymer #radialcanjharwinbarrozo1.2M
- Yellow 595nm LED Indication - Discrete 1.7V 1206 (3216 Metric) #forLedBlinkjharwinbarrozo1.1M
FlowState Headband EVT1 — 4-Channel EEG Calibration Device
Closed-loop EEG neurofeedback headband for theta/beta baseline calibration. 4-layer mixed-signal PCB, 40x30mm.
Core ICs:
- ADS1299-4PAG (TI) — 4-channel 24-bit EEG analog front end, SPI interface, 250 SPS
- nRF5340 (Nordic) — Dual-core BLE 5.3 SoC, 128 MHz app core + 64 MHz network core
Key requirements:
- Separate analog and digital power domains (dual LDO: LP5907 for AVDD, AP2112 for DVDD)
- Split analog/digital ground planes with single-point connection
- 6 electrode inputs (4 active + 1 reference + 1 DRL) with individual TVS ESD protection on each
- LIS2DH12 accelerometer (I2C) for motion artifact detection
- MCP73831 USB-C battery charging (300-500 mAh LiPo)
- 2.4 GHz chip antenna or PCB trace antenna at board edge with 10mm keepout
- Conformal coating for sweat/moisture protection
Reference designs:
- Analog front-end: TI ADS1299 EVM (SBAS499)
- Digital/BLE: Nordic nRF5340 DK reference schematic
Critical constraint: Microvolt-level EEG signals — analog input routing and power supply filtering are the highest-priority layout
concerns.
concerns.
Properties
Properties describe core aspects of the project.
Pricing & Availability
Distributor | Qty 1 |
|---|
Assets
Assets are files uploaded to this project which can be used in various ways.
Controls
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