Adafruit Feather M0 Express - ATSAMD21 Cortex M0

The Feather M0 is a compact and powerful development board, featuring the ATSAMD21G18 ARM Cortex M0+ processor running at 48 MHz with 3.3V logic, the same chip used in the Arduino Zero. With 256KB of FLASH and 32KB of RAM, the Feather M0 offers significantly more memory than traditional boards, making it an ideal platform for various projects.

Key Features:

• Processor: ATSAMD21G18 ARM Cortex M0+ at 48 MHz with 3.3V logic
• Memory: 256KB FLASH, 32KB RAM (more memory than older chips like Atmega328 or 32u4)
• USB: Built-in USB support for USB-to-Serial programming and debugging—no external FTDI chip required
• Power: 3.3V regulator with a 500mA peak current output
• I/O Pins: 20 GPIO pins, hardware Serial, I2C, SPI, PWM outputs on all pins
• Analog: 6 x 12-bit analog inputs, 1 x 10-bit analog output (DAC)
• Extras: Built-in 100mA lipoly charger with charging status LED, Mini NeoPixel, 2 MB SPI Flash storage, prototyping space
• Clock: 32.768 KHz crystal for clock generation and RTC
• Buttons & LEDs: Reset button, Pin #13 red LED for blinking, power/enable pin
• Mounting: 4 mounting holes

Dimensions:

• Size: 2.0" x 0.9" x 0.28" (51mm x 23mm x 8mm) without headers
• Weight: 5 grams

Special Features:

• SPI Flash Storage: 2MB of SPI Flash acts as a small storage drive for your scripts, libraries, and files when running CircuitPython. It also functions as a data logger or SD card when used with Arduino.
• Easy Reprogramming: Pre-loaded with the UF2 bootloader, allowing simple drag-and-drop firmware updates via USB, no special tools or drivers needed. Compatible with CircuitPython, PXT MakeCode, and Arduino IDE (Bossa-compatible).
• Battery: Includes a built-in lipoly charger (battery and USB cable not included, but available in the shop).

The Feather M0 is ideal for anyone looking for a small but powerful platform for their next project. Fully assembled and tested, this board provides excellent performance with ample features for a variety of applications. Plus, it comes with header pins for easy soldering and breadboarding.