# XIAO Lapel Audio Recorder CNC Prototype ## Description 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. ## Project Details - **Owner:** x0f5c3 - **Created:** 5/26/2026 - **Last Updated:** 5/26/2026 - **Visibility:** Public - **Forks:** 3 ## Key Components ### J1 — [Pin Socket 01x07 2.54mm Vertical](https://www.flux.ai/adrian95/pin-socket-01x07-254mm-vertical~b6d.md) - Part Type: Connector - Role Details: Left 1x7 female header for socketing XIAO ESP32S3 Sense; makes module replaceable during prototype stage - Role: Socket - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - Pin_1 [pin 1] - Pin_2 [pin 2] - Pin_3 [pin 3] - Pin_4 [pin 4] - Pin_5 [pin 5] - Pin_6 [pin 6] - Pin_7 [pin 7] ### J2 — [Pin Socket 01x07 2.54mm Vertical](https://www.flux.ai/adrian95/pin-socket-01x07-254mm-vertical~b6d.md) - Role Details: Right 1x7 female header for socketing XIAO ESP32S3 Sense; makes module replaceable during prototype stage - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Connector - Role: Socket **Pins:** - Pin_1 [pin 1] - Pin_2 [pin 2] - Pin_3 [pin 3] - Pin_4 [pin 4] - Pin_5 [pin 5] - Pin_6 [pin 6] - Pin_7 [pin 7] ### J3 — [B2B-PH-K-S](https://www.flux.ai/adrian95/b2b-ph-k-s~fx.md) - License: https://creativecommons.org/licenses/by/4.0/ - Role: Battery Connector - Datasheet URL: https://www.jst-mfg.com/product/pdf/eng/ePH.pdf - Manufacturer Name: JST - Role Details: 2-pin through-hole JST-PH connector for single-cell 3.7V LiPo; battery replaceable and uses XIAO onboard charger/power path - Manufacturer Part Number: B2B-PH-K-S - Part Type: Connector - Package or Case Code: JST_B2B-PH-K-S **Pins:** - 1 [pin 1] - 2 [pin 2] ### LED1 — [LTL-307EE](https://www.flux.ai/vasy_skral/ltl-307ee~a2.md) - Part Type: LED - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/1153/LTL-307EE.pdf - Manufacturer Part Number: LTL-307EE - Role Details: Through-hole external status LED; optional because XIAO GPIO21 built-in user LED is also available - Role: Status Indicator - Manufacturer Name: Lite-On Inc. **Pins:** - A [pin 2] - K [pin 1] ### SW1 — [B3F-1000](https://www.flux.ai/adrian95/b3f-1000~hh8.md) - Role: User Input - Part Type: Switch - Manufacturer Name: Omron Electronics Inc-EMC Div - Datasheet URL: https://omronfs.omron.com/en_US/ecb/products/pdf/en-b3f.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Role Details: Through-hole momentary button for record start/stop or marker input; replaceable prototype control - Manufacturer Part Number: B3F-1000 **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] ### U1 — [INMP441 MEMS](https://www.flux.ai/adrian95/inmp441-mems~b4r.md) - Part Type: Module - Datasheet URL: https://invensense.tdk.com/wp-content/uploads/2015/02/INMP441.pdf - Role Details: External INMP441 I2S microphone, left channel; onboard XIAO microphone intentionally unused - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: INMP441 - Manufacturer Name: InvenSense - Role: Audio Input **Pins:** - GND [pin 6] - L/R [pin 3] - SCK [pin 1] - SD [pin 4] - VCC [pin 5] - WS [pin 2] ### U2 — [Seeed Studio XIAO ESP32S3 Sense](https://www.flux.ai/gokux/seeed-studio-xiao-esp32s3-sense~bw.md) - Product Info Url: https://wiki.seeedstudio.com/xiao_esp32s3_getting_started/ - Manufacturer Name: seeed studio - Purchase Url: https://www.seeedstudio.com/XIAO-ESP32S3-Sense-p-5639.html - Part Type: Microcontroller - Datasheet URL: https://files.seeedstudio.com/wiki/SeeedStudio-XIAO-ESP32S3/res/esp32-s3_datasheet.pdf - Manufacturer Part Number: 113991115 - Role Details: Socketed Seeed XIAO ESP32S3 Sense; uses onboard SD-card slot, external I2S microphones, button, LED, and LiPo via BAT pad - Role: Main Controller **Pins:** - 3V3 [pin 14] - 5V [pin 16] - D10_A10_MOSI_GPIO9_TOUCH9 [pin 13] - D7_RX_GPIO44 [pin 10] - D8_A8_SCK_GPIO7_TOUCH7 [pin 11] - D9_A9_MISO_GPIO8_TOUCH8 [pin 12] - GND [pin 15] - GPIO43_TX_D6 [pin 7] - TOUCH1_GPIO1_A0_D0 [pin 1] - TOUCH2_GPIO2_A1_D1 - TOUCH3_GPIO3_A2_D2 [pin 3] - TOUCH4_GPIO4_A3_D3 [pin 4] - TOUCH5_GPIO5_SDA_A4_D4 [pin 5] - TOUCH6_GPIO6_SCL_A5_D5 [pin 6] ### U3 — [INMP441 MEMS](https://www.flux.ai/adrian95/inmp441-mems~b4r.md) - Part Type: Module - Role Details: External INMP441 I2S microphone, right channel; L/R tied high for stereo pair on shared data line - Datasheet URL: https://invensense.tdk.com/wp-content/uploads/2015/02/INMP441.pdf - Role: Audio Input - Manufacturer Name: InvenSense - Manufacturer Part Number: INMP441 - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - GND [pin 6] - L/R [pin 3] - SCK [pin 1] - SD [pin 4] - VCC [pin 5] - WS [pin 2] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/x0f5c3/xiao-lapel-audio-recorder-cnc-prototype~gi](https://www.flux.ai/x0f5c3/xiao-lapel-audio-recorder-cnc-prototype~gi).* --- *Generated from [https://www.flux.ai/x0f5c3/xiao-lapel-audio-recorder-cnc-prototype~gi](https://www.flux.ai/x0f5c3/xiao-lapel-audio-recorder-cnc-prototype~gi)*