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Live caption badge

fakefred·live-caption-badge·pcb/live-caption-badge.kicad_pcb

Live caption badge PCB layout, top view — open source ESP32 board by fakefred

About the Live caption badge PCB

Live caption badge is an open source ESP32 PCB design by fakefred, published on GitHub. It is a 4-layer board measuring 170 × 105.1 mm, with 109 components from 38 distinct parts.

Its main chip is the ESP32-S3-WROOM-1, from the ESP32 family. Other key parts include the HE9073A33M5R, ES7210, ES8311 and IS31AP2005. By type, the board carries 48 capacitors, 19 resistors, 17 test points, 6 ICs, 6 switches and 4 connectors.

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

From the project

EECS 473 Project

The Live Caption Badge is my team's capstone project for EECS 473, from September to December 2024. It is a device that transmits and transcribes speech in a noisy environment in real-time for the hard of hearing.

For technical details, please read our report (10.6 MiB).

- ESP32 with ESP-IDF and ESP-ADF - FreeRTOS - Audio streaming over HTTP - Peer discovery over BLE - Real-time speech-to-text with Vosk - E-Paper over SPI - Audio over I2S

Main components on the Live caption badge

ESP32-S3-WROOM-1HE9073A33M5RES7210ES8311IS31AP2005

Live caption badge bill of materials (BOM)

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

QtyPartRefs
1
ESP32-S3-WROOM-1
U1
2
HE9073A33M5R
U2, U3
1
ES7210
U4
1
ES8311
U5
1
IS31AP2005
U6
1
SI1308EDL
Si1308EDL
Q1
2
SS8050
Q2, Q3
1
FPC24
Conn_01x24
J1
1
CONN_01X06
Conn_01x06
J2
1
AUDIOJACK4
AudioJack4
J4
1
USB_C_RECEPTACLE_USB2.0_16P
USB_C_Receptacle_USB2.0_16P
J5
1
18650
BT1
1
SW_DPDT_X2
SW_DPDT_x2
SW1
1
RST
SW2
3
BTN
SW3, SW4, SW5
1
FLASH
SW6
17
TestPoint
TP1, TP2, TP3, TP4, TP5, TP6, TP7, TP8 +9
1
LED
D1
3
MBR0530
D2, D3, D4
1
68UH
68uH
L1
Show 18 more
QtyPartRefs
1
100UF
100uF
C1
1
22UF
22uF
C2
6
0.1UF
0.1uF
C3, C14, C15, C33, C34, C35
24
1UF
1uF
C4, C5, C11, C12, C13, C16, C17, C18 +16
1
47UF
47uF
C6
10
10UF
10uF
C7, C8, C9, C10, C37, C41, C42, C43 +2
3
22PF
22pF
C22, C23, C48
1
1uF
C36
1
4.7UF
4.7uF
C47
4
10K
10k
R1, R7, R18, R19
2
3.3K
3.3k
R2, R3
3
5.1K
5.1k
R4, R5, R6
3
0
R8, R13, R14
1
51
R9
1
2.2K
2.2k
R10
3
150K
150k
R11, R12, R15
1
300K
300k
R16
1
0.47
R17

Live caption badge design files

The KiCad project lives in the fakefred/live-caption-badge repository on GitHub; these links point at the commit this page was built from.

Live caption badge: common questions

What microcontroller does the Live caption badge use?

The Live caption badge is built around the ESP32-S3-WROOM-1, from the ESP32 family.

How big is the Live caption badge PCB?

The Live caption badge measures 170 × 105.1 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Live caption badge?

109 components, from 38 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 Live caption badge design files?

From the fakefred/live-caption-badge 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 Live caption badge design in my own project?

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

Can I test firmware for the Live caption badge 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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