2 layers54 × 40 mm
EchoSafe FrontLeft
Advk2k4/echosafe
Wearable real-time sound classifier for the hearing-impaired
6 parts
2 layers65 × 90 mm
EchoSafe RevA
Advk2k4/echosafeWearable real-time sound classifier for the hearing-impaired
- Size
- 65 × 90 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 30
- Nets
- 39
- Pads
- 211
- Tracks, vias
- 586, 76
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 4 May 2026
- Updated
- 12 Oct 2026
Overview
EchoSafe RevA is an open-source printed circuit board by Advk2k4, from the Advk2k4/echosafe repository on GitHub. It is a 2-layer board of 65 × 90 mm with 30 parts on 39 nets, routed with 586 tracks and 76 vias.
It is built around the ESP32-S3-WROOM-1-N16R8, DRV2605LDGS and MAX98357AETE+T, with the TCA9548APW and LD1117V33 among its other parts. Its parts include 14 capacitors, 7 ICs, 5 connectors and 2 resistors. It belongs with the audio and music and wearables boards and the ESP32 boards of this library.
Main components
5
ESP32-S3-WROOM-1-N16R8
SMD,25.5x18mm-103.5dBm -40℃~+65℃ 2.4GHz 20.5dBm 355mA 3V~3.6V 95mA ESP32-S3R8 On-board PCB Antenna UART、SPI、I2C、GPIO、I2S、USB SMD,25.5x18mm WiFi Modules ROHSEspressif SystemsWiFi Modules
DRV2605LDGS
VSSOP-10-0.5mm-40℃~+85℃ 1 2V~5.2V 500uA I2C Yes VSSOP-10-0.5mm Brushed DC Motor Drivers ROHSTexas InstrumentsBrushed DC Motor Drivers
MAX98357AETE+T
TQFN-16-EP(3x3)-40℃~+85℃ 2.4mA 2.5V~5.5V 3.2Wx1@4Ω 77dB 92% Automatic mute/no-noise switch、Enable/shutdown function、Filterless architecture Class D TQFN-16-EP(3x3) Audio Amplifiers ROHSMaxim Integrated (Analog Devices)Audio Amplifiers
TCA9548APW
TSSOP-24-40℃~+85℃ 1.65V~5.5V 2uA 400Kbps 80uA I2C、SMBus Power-up/reset configuration TSSOP-24 Interface - Specialized ROHSTexas InstrumentsSignal Switches, Multiplexers, Decoders
LD1117V33
TO-2200℃~+125℃@(Tj) 1 1.2V@(800mA) 100uV 15V 3.3V 5mA 75dB@(120Hz) 800mA Fixed Over Current Protection、Thermal Shutdown Positive TO-220 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSSTMicroelectronicsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
README
README.mdEchoSafe
Wearable, around-the-ear sound-alert device for people who are deaf or hard of hearing. ESP32-S3, 4 directional MEMS mics, on-device ML sound classification, 4 directional haptic motors.
See CLAUDE.md for architecture, pin mapping, ML pipeline, and
current status. See CONSOLIDATION_NOTES.md for
where this repo's contents came from.
firmware/ ESP32-S3 Arduino sketches (full system, single-mic reference, data collector)
ml/ Training pipeline + dataset
hardware/ 5 KiCad projects: central pod + 4 earpiece modules (PCB layout not yet started)
docs/ Supplementary reference docsParts
30| Qty | Value | Footprint | References |
|---|---|---|---|
| 8 | 1uF | Capacitor_SMD:C_0603_1608Metric | C5, C6, C7, C8, C13, C14, C17, C18 |
| 4 | DRV2605LDGS | Package_SO:VSSOP-10_3x3mm_P0.5mm | U3, U6, U7, U8 |
| 3 | 100nF | Capacitor_SMD:C_0603_1608Metric | C3, C4, C15 |
| 3 | 10uF | Capacitor_SMD:C_0603_1608Metric | C1, C2, C16 |
| 2 | 10k | Resistor_SMD:R_0603_1608Metric | R1, R2 |
| 2 | JST_SH_SM07B-SRSS-TB_1x07-1MP_P1.00mm_Horizontal | Connectors_PinMarked:JST_SH_SM07B-SRSS-TB_1x07-1MP_P1.00mm_Horizontal | J4, J5 |
| 2 | JST_SH_SM09B-SRSS-TB_1x09-1MP_P1.00mm_Horizontal | Connectors_PinMarked:JST_SH_SM09B-SRSS-TB_1x09-1MP_P1.00mm_Horizontal | J2, J3 |
| 1 | Battery_Cell | Connector_JST:JST_PH_S2B-PH-K_1x02_P2.00mm_Horizontal | BT1 |
| 1 | ESP32-S3-WROOM-1-N16R8 | ESP32-S3-WROOM-1:ESP32-S3-WROOM-1_EXP | U1 |
| 1 | LD1117V33 | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | LD1 |
| 1 | MAX98357AETE+T | MAX98357AETE-T:21-0136I_T1633-4_MXM | U2 |
| 1 | TCA9548A | Package_SO:TSSOP-24_4.4x7.8mm_P0.65mm | U5 |
| 1 | TP4056_Module | TP4056_Module:TP4056_Module | J1 |
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Questions
How big is the EchoSafe RevA PCB?
It measures 65 × 90 mm and has 2 copper layers, 1.6 mm thick.
What parts does the EchoSafe RevA use?
30 parts, built around the ESP32-S3-WROOM-1-N16R8, DRV2605LDGS, MAX98357AETE+T and TCA9548APW. 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 EchoSafe RevA KiCad files?
From the Advk2k4/echosafe repository on GitHub, at the commit this page was made from: the board is hardware/EchoSafe_RevA/EchoSafe_RevA/EchoSafe_RevA.kicad_pcb and its schematic hardware/EchoSafe_FrontLeft/EchoSafe_FrontLeft.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the EchoSafe RevA design in my own project?
Its repository states no licence, so its author keeps all rights: ask Advk2k4 before reusing the design.