Adafruit HELLA UNTZtrument! Open-Source 16x8 Grid Controller Kit [White LEDs]

The Adafruit HELLA UNTZtrument is a large, open-source 16×8 button grid controller kit with 128 illuminated buttons. Designed by PaintYourDragon and based on the Adafruit Trellis platform, this DIY kit assembles into a USB MIDI controller that works with any computer and virtually all synthesiser software — no drivers needed.

Powered by an Arduino Leonardo (not included), the controller sends MIDI Note On/Off messages for each button press by default, but can be reprogrammed to send any MIDI command. Since the Leonardo supports USB MIDI, keyboard emulation, and serial communication, the possibilities extend well beyond music into video control, lighting, and interactive installations.

Key Features

• 128 Illuminated Buttons – 16×8 grid with translucent button pads and diffused white LEDs
• USB MIDI Controller – Works instantly with any DAW or synth software
• Open-Source Design – Fully customisable firmware via Arduino IDE
• Trellis-Based Architecture – Eight interlocking Trellis control PCBs
• Laser-Cut Enclosure – Clear body with black top for a sturdy, professional finish
• Expandable – Add accelerometers, potentiometers, rotary encoders, and more using standard Arduino libraries

Ideal For

• MIDI music controllers and live performance
• Video and lighting control surfaces
• Interactive art installations
• Custom button-grid interfaces

Package Contents

• 8× Trellis Control PCBs
• 8× Silicone Elastomer 4×4 Button Pads (128 buttons total)
• 140× Diffused White 3 mm LEDs (128 needed, extras included)
• 1× Laser-cut enclosure (clear body, black top)

Resources

• UNTZtrument Assembly and Usage Guide