The Adafruit Rotary Trinkey is a tiny USB A board built around the ATSAMD21 microcontroller with a footprint for a standard rotary encoder and a built-in NeoPixel LED. Plug it into any USB A port on your computer and program it as a volume knob, scroll wheel, zoom control, or any custom rotary input device.

The board supports CircuitPython and Arduino, and over USB it can appear as a serial console, MIDI device, or HID keyboard/mouse — making it incredibly versatile for custom input projects. A capacitive touch pad and reset button round out the feature set.

Key Features

• ATSAMD21E18 Processor – 48 MHz 32-bit Cortex M0+ with 256 KB flash and 32 KB RAM
• USB A Plug – Plugs directly into any computer's USB A port, no cable needed
• Standard Rotary Encoder Footprint – Compatible with any PEC11 or PEC12 style 5-pin rotary encoder (not included)
• NeoPixel LED – Single RGB under-lighting LED for colour feedback
• Capacitive Touch Pad – One additional touch input
• Native USB – Serial, MIDI, and HID (keyboard/mouse) support
• CircuitPython & Arduino – Full support with existing Rotary, NeoPixel, and FreeTouch libraries

Ideal For

• Custom volume knobs and media controllers
• Scroll wheels and zoom controls
• MIDI controllers and music production tools
• Macro input devices and productivity shortcuts

Package Contents

• 1× Adafruit Rotary Trinkey (ATSAMD21, NeoPixel, capacitive touch)