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

J1
U4
U3
J5
U1
R5
Resistance
2.94kΩ
C16
Capacitance
100nF
R10
Resistance
10kΩ
R15
Resistance
10kΩ
R16
Resistance
10kΩ
C10
Capacitance
1uF
R21
Resistance
330kΩ
R1
Resistance
5.1kΩ
R8
Resistance
1.5kΩ
R7
Resistance
46.4kΩ
C7
Capacitance
10uF
C1
Capacitance
10uF
C2
Capacitance
10uF
C8
Capacitance
10uF
R20
Resistance
1MΩ
R14
Resistance
4.7kΩ
C4
Capacitance
10uF
C3
Capacitance
22uF
R2
Resistance
5.1kΩ
R9
Resistance
10kΩ
R6
Resistance
10kΩ
R19
Resistance
100Ω
R17
Resistance
10Ω
C9
Capacitance
100nF
C12
Capacitance
10uF
C13
Capacitance
100nF
R4
Resistance
3.57kΩ
C6
Capacitance
10uF
C14
Capacitance
10nF
R13
Resistance
4.7kΩ
C11
Capacitance
10uF
R12
Resistance
10kΩ
C15
Capacitance
100nF
R11
Resistance
10kΩ
C5
Capacitance
100nF
R18
Resistance
100Ω
R3
Resistance
3.09kΩ
TP4
J4
C17
Capacitance
10uF
F1
TP3
TP1
TP2
J3
J2
SW1
SW2
D3
SW5
L3
Inductance
1.5uH
D1
SW3
SW4
U2
D2

Smart Espresso Scale

Smart Espresso Scale thumbnail