A PCB business card that runs an LLM locally with an Ouija board-inspired LED layout.

Watch a video on the design of this business card here.

Special thanks to NextPB for sponsoring this project. Check out their website here

Bouija is a unique business card featuring an ESP32-S3 that runs a local Large Language Model. The device uses 40 individually addressable WS2812B LEDs arranged in an Ouija board pattern to visualize text generation in real-time.

• PCB Dimensions: 85mm × 54mm with 3mm corner radius
• LEDs: 40 WS2812B LEDs
  • 26 letters (A-Z)
  • 10 numbers (0-9)
  • 4 shortcuts: cap, slap, peace, sup
• MCU: ESP32-S3 with 8MB PSRAM and 16MB Flash
• Layout: Ouija board arrangement for cultural authenticity

Hard-coded messages with LED visualization and touch interaction.

Local LLM text generation using Dave Bennett's ESP32 LLM implementation. Credit to Dave Bennett for the LLM core - I added the visualization and interaction layer.

Requires ESP-IDF toolchain:

# Navigate to desired firmware directory
cd firmware/tinyllama  # or firmware/simple

# Build and flash
idf.py build
idf.py -p /dev/{DEVICE_PORT} flash

The PCB design is available in /pcb as a KiCad project.

It's a play on "Ouija" + "Binh" (the creator's name) - because what's a business card without a little wordplay? 👻

Running AI on a business card because why not?