EmbeddedRelated.com
The 2026 Embedded Online Conference
    Parts    3403
Adafruit Feather M0 Express

Adafruit Feather M0 Express

MPN: 3403
Adafruit Industries LLC
ATSAMD21G18 Feather M0 Express SAM D ARM® Cortex®-M0+ MCU 32-Bit Embedded Evaluation Board
Active55 in stock
Datasheet Digi-Key Mouser Compare Prices

Overview

The Adafruit Feather M0 Express is a compact development board featuring the Microchip ATSAMD21G18 ARM Cortex-M0+ microcontroller. It combines a powerful MCU with a Feather form factor, making it suitable for portable projects. This board offers a range of peripherals and includes USB native support for easy programming and debugging.

Why Choose This Part

Engineers benefit from the board's Feather form factor, providing a standardized footprint with numerous compatible add-on boards. The ATSAMD21G18 microcontroller offers a 48MHz ARM Cortex-M0+ core with 256KB Flash and 32KB RAM, suitable for many embedded tasks. Its native USB support and built-in LiPo charger simplify development for portable and connected applications.

Applications

Rapid Prototyping
Ideal for quickly developing and testing new ideas due to its integrated components and Arduino compatibility.
Wearable Electronics
Its small 23mm x 51mm footprint and integrated LiPo charger make it suitable for battery-powered wearable devices.
IoT End Nodes
Can serve as a low-power IoT end node with its Cortex-M0+ core, capable of interfacing with various sensors via I2C, SPI, and UART.
Educational Projects
An excellent platform for learning embedded programming and electronics, especially within the Arduino ecosystem.
Data Logging
With 256KB Flash and 32KB RAM, it can be used for basic data logging applications, storing sensor readings on board or transmitting them.
Custom HID Devices
Native USB support allows for the creation of custom human interface devices (HID) without external converters.

Getting Started

To get started, plug the Feather M0 Express into a computer via USB. It supports the Arduino IDE and CircuitPython, offering a flexible development environment. Use the onboard USB bootloader for easy firmware uploads, and leverage the serial port for debugging output.

The 2026 Embedded Online Conference