Adafruit Trinket M0

Overview

The Adafruit Trinket M0 is the smallest ARM Cortex-M0+ board in Adafruit's lineup, measuring just 27 × 15.3 mm and weighing 1.4 grams. Despite its tiny size, it runs the ATSAMD21E18 at 48 MHz with 256KB of flash and 32KB of SRAM — the same chip architecture used in the much larger Feather M0.

All five GPIO pins are independently usable (none are shared with USB), and all support 12-bit analog input. Three pins support hardware capacitive touch for touch-sensitive applications without any additional hardware. A true DAC output is available on one pin, and two high-speed PWM outputs are provided.

The built-in RGB DotStar LED (APA102-style) can be used for status indication or creative effects. The board also has a DMA-capable NeoPixel pin and enough memory to drive 8000+ NeoPixels or DotStars in sequence — despite the board's tiny size. A green power LED and red pin #13 LED round out the onboard indicators.

CircuitPython runs natively on the Trinket M0, allowing Python scripts to be developed without any compilation step — just copy a .py file onto the USB drive. The Arduino IDE is also fully supported. The Trinket M0 is ideal for small form factor projects, wearables, embedded installations, and anywhere you need a capable microcontroller in the smallest possible footprint.