Imported from GitHub: Open-Muscle/OpenMuscle-LASK5 · commit 800c8d0 · license CERN-OHL-S-2.0

Description

Handheld labeler wand for training ML models on gesture inputs

README

LASK 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