Adafruit Feather M0 Basic Proto pairs a powerful 48 MHz ARM Cortex-M0 with built-in battery charging and onboard prototyping space, making it ideal for portable and breadboard-free Arduino projects.
Feather is Adafruit’s portable development board family—thin, lightweight, and designed to go wherever your projects take you. Built to be a new standard for mobile microcontroller platforms, Feather combines power, flexibility, and battery support in a compact form factor.
The Feather M0 Basic Proto adds generous built-in prototyping space, making it ideal for quick experiments and compact builds without needing a separate breadboard. It’s part of the wider Feather ecosystem, which offers a range of boards for different use cases.
At the heart of the Feather M0 is the ATSAMD21G18 ARM Cortex-M0 processor, running at 48 MHz with 3.3 V logic—the same microcontroller used on the Arduino Zero. It offers a substantial upgrade over classic AVR boards, with 256 KB of flash and 32 KB of RAM, providing plenty of room for larger programs and more complex data handling. Native USB support is built in, so programming and debugging happen directly over USB with no external USB-to-serial chip required.
For portable projects, the board includes a JST connector for 3.7 V lithium polymer batteries and onboard battery charging. You can power the board directly from the micro USB connector, from a battery, or seamlessly switch between the two. The battery voltage is routed through a divider to an analogue pin, allowing you to monitor charge levels and know when it’s time to recharge.
The Feather M0 Basic Proto also includes a small prototyping area, perfect for soldering on buttons, sensors, or simple circuits—often eliminating the need for a breadboard in compact designs.
The board ships fully assembled and tested, with a USB bootloader pre-installed for quick use with the Arduino IDE. Header pins are included but not soldered. LiPo battery and USB cable are not included.
Features
ATSAMD21G18 @ 48MHz with 3.3V logic/power
256KB of FLASH + 32KB of RAM
No EEPROM
32.768 KHz crystal for clock generation & RTC
3.3V regulator with 500mA peak current output
USB native support, comes with USB bootloader and serial port debugging
You also get tons of pins - 20 GPIO pins
Hardware Serial, hardware I2C, hardware SPI support
PWM outputs on all pins
6 x 12-bit analogue inputs
1 x 10-bit analogue output (DAC)
Built in 100mA lipoly charger with charging status indicator LED
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