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Contact Mic Board

jackshisd·EoC-Lab·Hardware/Contact Mic Board/Contact Mic Board.kicad_pcb

Contact Mic Board layout, top view — open source board by jackshisd

About the Contact Mic Board

Contact Mic Board is an open source PCB design by jackshisd, published on GitHub. It is a 4-layer board measuring 31 × 18 mm, with 38 components from 14 distinct parts.

Other key parts include the ES8388 and MCP6002-XMC. By type, the board carries 20 capacitors, 14 resistors, 2 ICs, 1 connector and 1 inductor.

It belongs with the audio, iot & wireless and wearables designs in this gallery.

From the project

ESP32-based infant wearable for audio and video data acquisition with SD storage, BLE-triggered recording, and USB mass storage support.

WARNING: This project writes audio/video files to the SD card. Back up your data before testing.

Records: - Audio: WAV via I2S mic (ICS-43434), mic0001.wav, mic0002.wav, ... - Contact audio: WAV via ES8388 contact mic board, CT0001.WAV, CT0002.WAV, ... - Video: MJPEG via OV2640, VID0001.MJP, VID0002.MJP, ...

Core features: - SDMMC FAT mount/unmount - USB MSC to expose the SD card when idle - SSD1306 I2C OLED status - Button UI - BLE scan trigger (advertisements) with timestamped filenames - Simultaneous standard mic + contact mic recording to separate WAV files - Boot-time ES8388 codec…

Main components on the Contact Mic Board

ES8388MCP6002-XMC

Contact Mic Board bill of materials (BOM)

38 components, 14 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
ES8388
U1
1
MCP6002-XMC
MCP6002-xMC
U2
1
CONN_01X09_PIN
Conn_01x09_Pin
J1
1
FerriteBead_Small
FB1
7
0.1UF
0.1uF
C1, C3, C5, C6, C16, C18, C19
7
10UF
10uF
C2, C4, C7, C14, C15, C17, C20
4
1UF
1uF
C8, C9, C10, C13
2
470NF
470nF
C11, C12
2
47K
47k
R1, R2
2
10M
R3, R4
2
100K
100k
R5, R6
2
10K
R7, R8
2
1M
R9, R10
4
33
R11, R12, R13, R14

Contact Mic Board design files

The KiCad project lives in the jackshisd/EoC-Lab repository on GitHub; these links point at the commit this page was built from.

Contact Mic Board: common questions

How big is the Contact Mic Board?

The Contact Mic Board measures 31 × 18 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Contact Mic Board?

38 components, from 14 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Contact Mic Board design files?

From the jackshisd/EoC-Lab repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the Contact Mic Board design in my own project?

The repository has no license, so all rights stay with jackshisd. Use it as a reference, and ask the author before reusing the design.

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