Smart Espresso Scale


Routing completed successfully. I’m running final DRC/manufacturing/BOM checks now and will call out any remaining items that need manual sourcing or review.
The small post-route placement adjustment invalidated several existing traces, so I’m clearing the stale routing and running one clean re-route from the final placement.
Created a project doc

Layout Verification Notes — Smart Espresso Scale

View Document

Board set to compact 50 x 80 mm rounded rectangle. Stackup set to Standard 4 Layer.
Completed the PCB layout pass: the board is 50 × 80 mm, 4-layer, placed with the ESP32 antenna intentionally overhanging the top edge, and fully routed with no airwires/overlap/dangling/invalid-layer errors remaining.
Open items:
  • U1 still reports a body-over-edge warning; this is intentional for the ESP32 antenna keepout.
  • BOM still needs final MPNs for generic resistors/capacitors, L3 inductor, and J4 header; TP1–TP4 were excluded from BOM/PnP.
  • Routing used 0.1 mm traces to enter fine-pitch parts, so power paths should be widened/poured before manufacturing.
I documented the verification details in Layout Verification Notes.
Suggested next steps:
  1. Select final passive/inductor/header MPNs.
  2. Widen/pour VBUS, BAT, SYS, REG_IN, and 3V3 power paths.
  3. Verify antenna keepout visually/mechanically.
  4. Export Gerbers/BOM/PnP once BOM MPNs are finalized.
Finalize BOM and power
Select final MPNs
Widen power paths
Verify RF keepout
Run manufacture export

U4
R8
Resistance
1.5kΩ
R3
Resistance
3.09kΩ
C2
Capacitance
10uF
C4
Capacitance
10uF
C3
Capacitance
22uF
C6
Capacitance
10uF
J2
C17
Capacitance
10uF
L3
Inductance
1.5uH

Smart Espresso Scale

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