CNC-Friendly XIAO Recorder Design

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I’ll convert the current layout into a CNC-friendly prototype variant: first I’ll inspect the schematic/layout, then set the board to 70×50 mm with a simple stackup and generous rules, then re-place components for hand soldering and CNC isolation, and finally run checks.

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Created the CNC-friendly prototype variant.
  • Renamed it to XIAO Lapel Audio Recorder CNC Prototype and updated the description.
  • Resized the PCB to 70 × 50 mm, 2-layer/raw-laminate-friendly.
  • Applied wide-trace CNC rules: 0.8 mm default traces, 0.5 mm minimum, 0.8–1.0 mm keepouts, expanded pad openings, and hand-solder thermal relief.
  • Removed the old compact routing so it can be re-routed cleanly for CNC isolation.
  • Re-placed parts for hand soldering: XIAO socket/header area at the top, microphones spread left/right, LiPo connector on the bottom edge, button and LED on the front/bottom edge.
Review result: placement is usable with no overlap/out-of-board placement issues, but the board is intentionally unrouted now, so airwire errors remain. Manufacturer part number warnings also remain for generic passives and headers, which is expected for a prototype unless you want a finalized BOM.
Next step is routing with the new CNC-friendly wide traces. Want me to route it now?
Route top copper
Check CNC clearances
Add test pads
Show placement
R1
Resistance
330 ohms
U2 D8_A8_SCK_GPIO7_TOUCH7 - J2 Pin_2
R1 P2 - LED1 A
BAT_PLUS_XIAO_PAD
U2 3V3 - J2 Pin_5
U3 L/R - C1 P1
U2 TOUCH4_GPIO4_A3_D3 - J1 Pin_4
U2 D7_RX_GPIO44 - J2 Pin_1
U2 5V - J2 Pin_7
R2
Resistance
100000 ohms
R1 P2 - LED1 A
U2 GPIO43_TX_D6 - J1 Pin_7
U2 D9_A9_MISO_GPIO8_TOUCH8 - J2 Pin_3
U2 D10_A10_MOSI_GPIO9_TOUCH9 - J2 Pin_4
SW1 4 - LED1 K
J3
LED1
U2
Manufacturer Part Number
113991115
GND
GND
GND
C3
Capacitance
10 uF
GND
  • Generic Inductor
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  • Generic Capacitor
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  • Generic Resistor
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XIAO Lapel Audio Recorder CNC Prototype

XIAO Lapel Audio Recorder CNC Prototype thumbnail
70x50 mm CNC-friendly raw-laminate XIAO ESP32S3 lapel audio recorder prototype with socketed XIAO, dual external INMP441 microphones, LiPo connector, button/status LED, and SD-card recording support. Layout prioritizes hand soldering, replaceable parts, wide traces, and generous isolation clearances over compactness.

Properties

Properties describe core aspects of the project.

Pricing & Availability

Distributor

Qty 1

Arrow

$13.50–$13.61

Digi-Key

$14.43

HQonline

$0.13

LCSC

$87.74

Mouser

$14.42

TME

$0.22

Verical

$13.40–$86.80

Controls