Adafruit Feather M0 Adalogger

Overview

The Adafruit Feather M0 Adalogger combines the 32-bit ARM Cortex-M0+ performance of the Feather M0 platform with an integrated microSD card slot for data logging. Based on the ATSAMD21G18 at 48 MHz with 256KB flash and 32KB RAM, it offers significantly more processing power and memory than AVR-based Adalogger variants while maintaining the compact Feather form factor (51 × 23 mm, 5.3g).

The microSD slot enables onboard storage for sensor readings, GPS coordinates, environmental data, and other time-series records. A green LED on pin 8 serves as a logging indicator alongside the standard red LED. The 12-bit ADC (versus 10-bit on AVR boards), 10-bit DAC, and PWM capability on all pins expand sensor and actuator options compared to 8-bit platforms.

USB is handled natively by the ATSAMD21, enabling drag-and-drop CircuitPython firmware installation and USB serial monitoring. The integrated 100mA LiPoly charger manages 3.7V LiPo battery charging with automatic USB/battery switchover. The 3.3V regulator provides 500mA peak output.

As a CircuitPython-capable board, the M0 Adalogger supports the Python storage module for direct filesystem access to the microSD card, making data logging accessible without C/C++ file I/O boilerplate. It stacks with all FeatherWing accessories through the standard Feather header system.