4 layers75 × 35 mm
LASK V2-0
Open-Muscle/OpenMuscle-LASK5
Handheld labeler wand for training ML models on gesture inputs
45 parts3CERN-OHL-S-2.0
4 layers75 × 35 mm
LASK5-V3-0
Open-Muscle/OpenMuscle-LASK53Handheld labeler wand for training ML models on gesture inputs
- Size
- 75 × 35 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 56
- Nets
- 64
- Pads
- 233
- Tracks, vias
- 696, 69
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 19 May 2025
- Updated
- 9 Jun 2026
Overview
LASK5-V3-0 is an open-source printed circuit board by Open-Muscle, from the Open-Muscle/OpenMuscle-LASK5 repository on GitHub, published under the CERN-OHL-S-2.0 licence. It is a 4-layer board of 75 × 35 mm with 56 parts on 64 nets, routed with 696 tracks and 69 vias.
It is built around the ESP32-S3-WROOM-1-N16R8, ICM-42688-P and LTC4054ES5-4.2#PBF, with the TPS7A03DQN and BAT54C among its other parts. Its parts include 11 capacitors, 11 resistors, 6 connectors, 4 ICs and 4 diodes. It belongs with 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
ICM-42688-P
LGA-14(2.5x3)-40℃~+85℃ 1.71V~3.6V 16bit 2KB 7.5uA IMU (accelerometer + gyroscope) SPI、I2C X,Y,Z X,Y,Z ±16g ±2000dps Motion Event Detection, Synchronization, Timestamp Support LGA-14(2.5x3) Accelerometers ROHSTDK InvenSenseAccelerometers
LTC4054ES5-4.2#PBF
SOT-23-5-40℃~+85℃ 1 200uA 4.25V~6.5V 4.2V 800mA Charging IC Lithium Battery Not supported Not supported SOT-23-5 Battery Management ROHSAnalog DevicesBattery ManagementTPS7A03DQN
UncategorisedTexas Instruments
BAT54C
SOT-231 Pair Common Cathode 200mA 2uA@25V 30V 600mA 800mV@100mA SOT-23 Schottky Diodes ROHSNexperiaSchottky Diodes
README
KiCad/LASK_V3-0/README.mdLASK v3 – OpenMuscle Labeler PCB
Version: 3.0
KiCad Version: 9.0.1
Project Type: Embedded hardware (ESP32-based controller)
Use Case: Labeling hand movement data for prosthetic machine learning models
This is the third iteration of the LASK (Labeler for Sensor Kit) PCB, designed as part of the OpenMuscle project. LASK v3 is a handheld device used to interact with muscle sensors, label data, and provide haptic and motion feedback during training sessions.
🧠 Major Additions in v3
- ✅ Added haptic motor driver with flyback diode protection
- ✅ Added ICM-42688-P IMU (I²C, with alternate support for SPI)
- ✅ Enhanced power management using a push-button latch and USB auto-power-on
- ✅ Clean GPIO assignments for consistent firmware development
🧩 System Overview
| Subsystem | Description |
|---|---|
| MCU | ESP32-S3-WROOM-1 (16MB flash, 8MB PSRAM) |
| Sensors | 4x Hall effect sensors w/ 100nF capacitors to ground |
| IMU | ICM-42688-P (I²C: GPIO8=SDA, GPIO9=SCL) |
| Display | SSD1306 OLED (I²C shared) |
| Input | 2 buttons (Menu & Select), Thumb joystick w/ push |
| Output | Haptic motor driven via MOSFET on GPIO17 |
| Power | MAX16054 latch, TPS7A0333 LDO, LTC4054 charger |
| Interface | USB-C for charging and programming |
🧷 GPIO Pinout
| Function | GPIO |
|---|---|
| Hall Sensor 0 | 1 |
| Hall Sensor 1 | 2 |
| Hall Sensor 2 | 3 |
| Hall Sensor 3 | 4 |
| Joystick X | 5 |
| Joystick Y | 6 |
| Joystick Switch | 7 |
| I²C SDA (IMU + OLED) | 8 |
| I²C SCL (IMU + OLED) | 9 |
| Select Button | 10 |
| SPI MISO | 11 |
| SPI SCK | 12 |
| SPI MOSI | 13 |
| Haptic Motor Signal | 17 |
| Battery Voltage ADC | 18 |
| Menu Button | 21 |
| SPI CS (available) | 22 |
🔋 Power Management
- Charging: LTC4054 linear charger via USB-C
- Voltage Regulation: TPS7A0333 LDO with EN pin control
- Power-on Logic: MAX16054 handles push-button latching
- VBUS detection auto-enables LDO via diode OR circuit
- Power can also be toggled with push button
- Haptic Driver: IRLML2060 N-MOSFET, protected by 1N4007 diode
🛠️ Schematic
📁 Located in
/kicad_project/
🧪 Development Notes
- Future version may migrate IMU to SPI for better performance
- USB VBUS is sensed to allow automatic boot when plugged in
- Add decoupling capacitors on IMU pins for improved stability (see TODO in schematic)
📂 Repository Structure
/
├── kicad_project/
│ ├── LASKS-V3_0.kicad_sch
│ └── LASKS-V3_0.kicad_pcb
├── docs/
│ └── lask_v3_schematic.png
├── README.md🔓 License
Open-source under CERN-OHL-W v2
Part of the OpenMuscle Project
Parts
56| Qty | Value | Footprint | References |
|---|---|---|---|
| 5 | 100 nF | Capacitor_SMD:C_0603_1608Metric | C1, C2, C3, C4, C5 |
| 5 | SW_Push | OpenMuscleDevKit:EVQP2P02M | SW_BOOT1, SW_M1, SW_PWR1, SW_RST1, SW_SEL1 |
| 4 | A1369xUA-10 | Connector_PinHeader_2.00mm:PinHeader_1x03_P2.00mm_Vertical | H1, H2, H3, H4 |
| 3 | 100k | Resistor_SMD:R_0603_1608Metric | R7, R8, R9 |
| 3 | 5.1K | Resistor_SMD:R_0603_1608Metric | R1, R2, R6 |
| 2 | 10k | Resistor_SMD:R_0603_1608Metric | R10, R11 |
| 2 | 2.2 uF | Capacitor_SMD:C_0603_1608Metric | C8, C11 |
| 2 | 4.7uF | Capacitor_SMD:C_0805_2012Metric | C6, C7 |
| 2 | Conn_01x04 | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J1, J9 |
| 2 | Conn_01x05_Pin | Connector_PinHeader_2.00mm:PinHeader_1x05_P2.00mm_Vertical | Joystick1, Joystick2 |
| 2 | IRLML2060 | Package_TO_SOT_SMD:SOT-23 | Q1, Q3 |
| 2 | JST_02 | Connector_JST:JST_EH_B2B-EH-A_1x02_P2.50mm_Vertical | BattExtLTC4054, J2 |
| 2 | MountingHole | MountingHole:MountingHole_2.2mm_M2 | H7, H8 |
| 1 | 0.1 uF | Capacitor_SMD:C_0603_1608Metric | C10 |
| 1 | 100 uF | Capacitor_SMD:C_0603_1608Metric | C9 |
| 1 | 150 | Resistor_SMD:R_0603_1608Metric | R5 |
| 1 | 1K | Resistor_SMD:R_0603_1608Metric | R3 |
| 1 | 1N4007 | Diode_SMD:D_SOD-123 | D4 |
| 1 | 1N5819 | Diode_SMD:D_SOD-123F | D1 |
| 1 | 2k | Resistor_SMD:R_0603_1608Metric | R4 |
| 1 | BAT54C | Package_TO_SOT_SMD:SOT-23 | D3 |
| 1 | CHRG LED | LED_SMD:LED_0805_2012Metric | D2 |
| 1 | Conn_01x02 | Connector_PinHeader_2.00mm:PinHeader_1x02_P2.00mm_Vertical | J5 |
| 1 | Conn_01x04_Pin | Connector_PinHeader_2.00mm:PinHeader_1x04_P2.00mm_Vertical | J3 |
| 1 | Conn_01x06_Pin | Connector_PinHeader_1.27mm:PinHeader_1x06_P1.27mm_Vertical | J6 |
| 1 | ESP32-S3-WROOM-1-N16R8 | footprints:ESP32-S3-WROOM-1_EXP | U2 |
| 1 | ICM-42688-P | ICM-42688-P:IIM42352 | IC1 |
| 1 | Jumper_2_Open | Jumper:SolderJumper-2_P1.3mm_Open_TrianglePad1.0x1.5mm | JP1 |
| 1 | LTC4054ES5-4.2 | Package_TO_SOT_SMD:TSOT-23-5 | U4 |
| 1 | TPS7A03 | Package_TO_SOT_SMD:SOT-23-5 | U3 |
| 1 | USB_C_Receptacle | Connector_USB:USB_C_Receptacle_HRO_TYPE-C-31-M-12 | J4 |
| 1 | VP0610T | Package_TO_SOT_SMD:SOT-23 | Q2 |
| 1 | ~ | Package_TO_SOT_SMD:SOT-23-6 | MAX1 |
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Questions
How big is the LASK5-V3-0 PCB?
It measures 75 × 35 mm and has 4 copper layers, 1.6 mm thick.
What parts does the LASK5-V3-0 use?
56 parts, built around the ESP32-S3-WROOM-1-N16R8, ICM-42688-P, LTC4054ES5-4.2#PBF and TPS7A03DQN. 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 LASK5-V3-0 KiCad files?
From the Open-Muscle/OpenMuscle-LASK5 repository on GitHub, at the commit this page was made from: the board is KiCad/LASK_V3-0/LASK5-V3-0.kicad_pcb and its schematic KiCad/LASK_V1-1/LASK_V1-1.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the LASK5-V3-0 design in my own project?
Its repository publishes it under the CERN-OHL-S-2.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).