HUSB238 USB-C PD Controller - Web Bluetooth

Web-based control for the HUSB238 USB-C Power Delivery module via Bluetooth Low Energy.

Live Demo

Try it now: https://unit-electronics-mx.github.io/unit_web_devlab_husb238_usb_c_pd_module/

Requirements: Chrome/Edge browser with Bluetooth enabled. ESP32 + HUSB238 hardware must be programmed and powered.

Features

• Control USB-C PD voltage negotiation (5V, 9V, 12V, 15V, 18V, 20V)
• Read current and voltage status
• Monitor connection state
• Automatic voltage sweep
• Web-based interface (no installation required)

Hardware

• ESP32-H2 (Pulsar H2) or compatible ESP32 board
• HUSB238 USB-C PD module
• I2C connection:
  • SDA: GPIO12
  • SCL: GPIO22

Quick Start

1. Flash Firmware

1. Open Arduino IDE
2. Install Adafruit_HUSB238 library
3. Open husb238/husb238_ble.ino
4. Select your ESP32 board
5. Upload sketch

2. Connect

1. Open the web application
2. Click "Connect to HUSB238"
3. Select "HUSB238" from Bluetooth devices
4. Control voltages from the web interface

SCPI Commands

The firmware supports SCPI-like commands via BLE or Serial:

*IDN?              - Device identification
STAT?              - USB-C connection status
PD:LIST?           - List available voltages
PD:GET?            - Get current voltage
PD:SET<voltage>    - Set voltage (5, 9, 12, 15, 18, 20)
PD:SWEEP           - Sweep all available voltages
CURR:GET?          - Get current
CURR:MAX?<voltage> - Get max current for voltage

Project Structure

├── husb238/
│   └── husb238_ble.ino    # ESP32 firmware
├── docs/
│   ├── index.html         # Web application
│   └── script-husb238.js  # BLE logic
└── .github/
    └── workflows/
        └── deploy-gh-pages.yml  # Auto-deployment

Development

Local testing:

cd docs
python3 -m http.server 8000

Open http://localhost:8000 in Chrome/Edge.

Troubleshooting

Device not found: Ensure ESP32 is powered and BLE is initialized (check serial monitor).

Service not found: Clear browser BLE cache at chrome://bluetooth-internals and forget the device.

Connection fails: Verify I2C pins match your hardware configuration.

License

MIT License - UNIT Electronics