HardLabs

Keyfob Board

jackshisd·EoC-Lab·Hardware/Keyfob Board/Keyfob Board.kicad_pcb

Keyfob Board layout, top view — open source ESP32 board by jackshisd

About the Keyfob Board

Keyfob Board is an open source ESP32 PCB design by jackshisd, published on GitHub. It is a 2-layer board measuring 20 × 21.2 mm, with 5 components from 2 distinct parts.

Its main chip is the ESP32-S3-WROOM-2, from the ESP32 family. By type, the board carries 4 switches and 1 IC.

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 Keyfob Board

ESP32-S3-WROOM-2

Keyfob Board bill of materials (BOM)

5 components, 2 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
ESP32-S3-WROOM-2
MDBT42Q-512K
U1
4
SW_Push
SW1, SW2, SW3, SW4

Keyfob 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.

Keyfob Board: common questions

What microcontroller does the Keyfob Board use?

The Keyfob Board is built around the ESP32-S3-WROOM-2, from the ESP32 family.

How big is the Keyfob Board?

The Keyfob Board measures 20 × 21.2 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Keyfob Board?

5 components, from 2 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 Keyfob 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 Keyfob 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.

Can I test firmware for the Keyfob Board without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug ESP32 firmware against it before you order a PCB.

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