Everything you need to get started with the NeoTrellis M4 in one kit. This pack bundles the NeoTrellis M4 Mainboard, an acrylic enclosure, silicone elastomer button pads, and rubber feet — ready to assemble into a complete MIDI controller, sound board, or interactive button-pad device.

The NeoTrellis M4 is an all-in-one USB + NeoPixel + Elastomer + Audio board powered by the ATSAMD51 Cortex M4 running at 120 MHz. With 512 KB flash, 192 KB SRAM, and 8 MB SPI flash for file storage, it supports both CircuitPython and Arduino with room to spare for audio clips and complex code.

Key Features

• ATSAMD51 Cortex M4 – 120 MHz 32-bit processor with hardware DSP and floating-point support
• 512 KB Flash + 192 KB SRAM + 8 MB SPI Flash – Ample storage for code, files, and audio
• 4×8 Elastomer Button Pads – Fully diode'd matrix with no ghosting, reads all simultaneous presses
• 32 NeoPixels – One under each button pad, 24-bit colour, glows through translucent elastomers
• Stereo Audio Output – Dual 12-bit 500 KSPS DACs on left/right of a TRRS headphone jack
• Microphone Input – MAX4466 electret mic amplifier on the 4th headphone pin
• ADXL343 Accelerometer – Triple-axis accelerometer for tilt, motion, and tap detection
• Native USB – USB MIDI device support (Arduino), USB HID, and CircuitPython serial
• 4-Pin JST Hacking Port – STEMMA/Grove compatible with 3.3 V, GND, and two GPIO

Ideal For

• MIDI controllers and music sequencers
• Audio synthesisers and sound effects boards
• Interactive button-pad interfaces and games
• Light-up performance controllers
• CircuitPython and Arduino learning projects

Package Contents

• 1× Adafruit NeoTrellis M4 Mainboard (SAMD51)
• 1× NeoTrellis M4 Acrylic Enclosure Kit
• 1× Silicone Elastomer 4×4 Button Keypad (2-pack)
• 1× Rubber Bumper Feet (4 bumpers)

Resources

• NeoTrellis M4 Learn Guide – Setup, wiring, and example projects