2 layers40 × 33 mm
4 layers170 × 105.1 mm
Live caption badge
fakefred/live-caption-badge1EECS 473 Project
- Size
- 170 × 105.1 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 123
- Nets
- 113
- Pads
- 404
- Tracks, vias
- 556, 82
- Pours
- 8
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 22 Oct 2024
- Updated
- 26 Feb 2025
Overview
Live caption badge is an open-source printed circuit board by fakefred, from the fakefred/live-caption-badge repository on GitHub. It is a 4-layer board of 170 × 105.1 mm with 123 parts on 113 nets, routed with 556 tracks and 82 vias.
It is built around the ESP32-S3-WROOM-1-N8, ES7210 and ES8311, with the HE9073A33M5R, MBR0530 and SS8050 among its other parts. Its parts include 48 capacitors, 19 resistors, 6 ICs, 6 switches and 4 diodes. It belongs with the lEDs and displays boards and the ESP32 boards of this library.
Main components
7
ESP32-S3-WROOM-1-N8
SMD,25.5x18mm-40℃~+85℃ -98.2dBm 2.4GHz 20.5dBm 355mA 3V~3.6V 95mA Bluetooth5.0 ESP32-S3 Chip On-board PCB Antenna UART、SPI、I2C、I2S、USB SMD,25.5x18mm WiFi Modules ROHSEspressif SystemsWiFi Modules
ES7210
QFN-32-EP(4x4)-40℃~+85℃ 1.6V~3.6V 100kHz 10uA 24 4 Audio Analog-to-Digital Converter I2S Power-down mode Sigma-Delta QFN-32-EP(4x4) ADCs/DACs - Special Purpose ROHSEverest-semiADCs/DACs - Special Purpose
ES8311
QFN-20-EP(3x3)-40℃~+105℃ 0uA 1.8V~3.3V QFN-20-EP(3x3) Audio Interface ICs ROHSEverest-semiSignal Switches, Multiplexers, Decoders
HE9073A33M5R
SOT-23-5-40℃~+85℃ 1 100mV 3.3V 300nA 500mA 70dB@(1kHz) 7V Fixed Over Current Protection、Over Temperature Protection、Enable、Short Circuit Protection Positive SOT-23-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSHEERMICRVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
MBR0530
SOD-1231 Independent 30V 5.5A 500mA 550mV@500mA 80uA@30V SOD-123 Schottky Diodes ROHSJiangsu Changjing Electronics Technology (CJ)Schottky Diodes
SS8050
SOT-323-55℃~+150℃ 1 NPN 1.5A 100MHz 100nA 200 25V 300mW 500mV 5V NPN SOT-23 Bipolar (BJT) ROHSJiangsu Changjing Electronics Technology (CJ)Bipolar (BJT)SI1308EDL
SC-70-3-55℃~+150℃ 1 N-channel 1.4nC@10V 1.5A 1.5V 105pF 11pF 132mΩ@10V 23pF 30V 400mW N-Channel SOT-323 MOSFETs ROHSVishay IntertechnologyMOSFETs
README
README.mdLive Caption Badge
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).
Technical Highlights
- 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
Files
firmwareis the firmware our product actually ran on Design Expo.audio,BLEnWifi,echo,epapercontain the code we used to test various components.pcbis our PCB design. It is a 4-layer board.transcribecontains the code for the central serverserver_esp.py, which ran on a laptop on Design Expo. It is responsible for transcribing text and relaying audio. We also usedhack.pyto apply hotfixes to the badges.
Parts
123| Qty | Value | Footprint | References |
|---|---|---|---|
| 25 | 1uF | Capacitor_SMD:C_0603_1608Metric | C11, C12, C13, C16, C17, C18, C19, C20, C21, C24, C25, C26, C27, C28, C29, C30 +9 |
| 17 | TestPoint | Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Vertical | TP1, TP2, TP3, TP4, TP5, TP6, TP7, TP8, TP10, TP11, TP12, TP13, TP14, TP15, TP16, TP17 +1 |
| 10 | 10uF | Capacitor_SMD:C_0603_1608Metric | C7, C8, C9, C10, C37, C41, C42, C43, C44, C46 |
| 6 | 0.1uF | Capacitor_SMD:C_0603_1608Metric | C3, C14, C15, C33, C34, C35 |
| 4 | 10k | Resistor_SMD:R_0603_1608Metric | R1, R7, R18, R19 |
| 3 | 0 | Resistor_SMD:R_0603_1608Metric | R8, R13, R14 |
| 3 | 150k | Resistor_SMD:R_0603_1608Metric | R11, R12, R15 |
| 3 | 22pF | Capacitor_SMD:C_0603_1608Metric | C22, C23, C48 |
| 3 | 5.1k | Resistor_SMD:R_0603_1608Metric | R4, R5, R6 |
| 3 | BTN | live-caption-badge:SW_Push_TL1100CF160Q | SW3, SW4, SW5 |
| 3 | MBR0530 | Diode_SMD:D_SOD-123 | D2, D3, D4 |
| 2 | 3.3k | Resistor_SMD:R_0603_1608Metric | R2, R3 |
| 2 | HE9073A33M5R | Package_TO_SOT_SMD:SOT-23-5 | U2, U3 |
| 2 | SS8050 | Package_TO_SOT_SMD:SOT-23 | Q2, Q3 |
| 1 | 0.47 | Resistor_SMD:R_0603_1608Metric | R17 |
| 1 | 100uF | Capacitor_THT:CP_Radial_D8.0mm_P3.50mm | C1 |
| 1 | 18650 | live-caption-badge:BH-18650-B1BA002 | BT1 |
| 1 | 2.2k | Resistor_SMD:R_0603_1608Metric | R10 |
| 1 | 22uF | Capacitor_SMD:C_0603_1608Metric | C2 |
| 1 | 300k | Resistor_SMD:R_0603_1608Metric | R16 |
| 1 | 4.7uF | Capacitor_SMD:C_0603_1608Metric | C47 |
| 1 | 47uF | Capacitor_SMD:C_0603_1608Metric | C6 |
| 1 | 51 | Resistor_SMD:R_0603_1608Metric | R9 |
| 1 | 68uH | live-caption-badge:L_Bourns-SDEE0406A | L1 |
| 1 | AudioJack4 | live-caption-badge:Jack_3.5mm_PJ320D_Horizontal | J4 |
| 1 | Conn_01x06 | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J2 |
| 1 | Conn_01x24 | live-caption-badge:FPC05024-13200_1x24-1MP_P0.50_Horizontal | J1 |
| 1 | ES7210 | Package_DFN_QFN:QFN-32-1EP_4x4mm_P0.4mm_EP2.9x2.9mm | U4 |
| 1 | ES8311 | Package_DFN_QFN:QFN-20-1EP_3x3mm_P0.4mm_EP1.65x1.65mm | U5 |
| 1 | ESP32-S3-WROOM-1 | live-caption-badge:ESP32-S3-WROOM-1-LargerVias | U1 |
| 1 | FLASH | live-caption-badge:SW_Push_6x3mm | SW6 |
| 1 | IS31AP2005 | Package_SO:MSOP-8_3x3mm_P0.65mm | U6 |
| 1 | LED | LED_SMD:LED_0603_1608Metric | D1 |
| 1 | RST | live-caption-badge:SW_Push_6x3mm | SW2 |
| 1 | SW_DPDT_x2 | live-caption-badge:SW_DPDT_SLW-867569-4A-N-D | SW1 |
| 1 | Si1308EDL | Package_TO_SOT_SMD:SOT-323_SC-70 | Q1 |
| 1 | USB_C_Receptacle_USB2.0_16P | live-caption-badge:USB_C_Receptacle_Molex_2169900002 | J5 |
The 109 most common of 123 parts.
Questions
How big is the Live caption badge PCB?
It measures 170 × 105.1 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Live caption badge use?
123 parts, built around the ESP32-S3-WROOM-1-N8, ES7210, ES8311 and HE9073A33M5R. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Live caption badge KiCad files?
From the fakefred/live-caption-badge repository on GitHub, at the commit this page was made from: the board is pcb/live-caption-badge.kicad_pcb and its schematic pcb/audio.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Live caption badge design in my own project?
Its repository states no licence, so its author keeps all rights: ask fakefred before reusing the design.
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