Upgrade your button-pad projects with full-colour NeoPixel backlighting. The NeoTrellis RGB Driver PCB is a 4×4 keypad controller with 16 NeoPixels and an onboard seesaw I2C chip that handles both button scanning and LED driving — all over plain I2C, no NeoPixel pin management required.

The boards are fully tileable — solder them edge-to-edge and close the I2C address jumpers to create grids of any arrangement, up to 32 boards on a single I2C bus. Both Arduino/C++ and CircuitPython/Python libraries are available. For a complete ready-to-go kit, see the 4×4 NeoTrellis Feather M4 Kit Pack.

Key Features

• 16 NeoPixels – Full 24-bit RGB LEDs pre-soldered, one under each button position
• Seesaw I2C Controller – Onboard chip manages both button matrix and NeoPixel driving over I2C
• Fully Tileable – Solder boards edge-to-edge for larger grids (up to 32 boards / 512 buttons)
• 5 Address Pins – Configure up to 32 unique I2C addresses for tiled setups
• JST-PH 4-Pin Connector – Quick connection for power and I2C data (Grove compatible)
• 3 V and 5 V Compatible – Works with any microcontroller or single-board computer with I2C

Tiling

To create larger button grids, solder NeoTrellis boards edge-to-edge and close the I2C address jumpers on each board to assign unique addresses. A single I2C connection controls all tiled boards — no additional wiring needed beyond the edge solder joints.

Ideal For

• MIDI controllers and music sequencers
• Custom control panels and interfaces
• Interactive art and light installations
• Game controllers with colourful button feedback
• Scalable button grids for any project

Package Contents

• 1× Adafruit NeoTrellis RGB Driver PCB with seesaw chip and 16 NeoPixels pre-soldered
• 1× JST-PH 4-pin connector

Resources

• NeoTrellis Learn Guide – Setup, tiling, and example code