The Feather M0 Adalogger is an all-in-one datalogger built around the ATSAMD21G18 ARM Cortex M0 processor, with a built-in MicroSD card holder, native USB, and LiPo battery charging. With 256KB of flash and 32KB of RAM — 8× and 16× more than the ATmega328 or 32u4 respectively — it provides significantly more processing power and memory for data-intensive projects.

The same chip used in the Arduino Zero, the ATSAMD21 includes native USB support for programming, serial debugging, and HID device emulation without needing a separate USB-serial converter.

Key Features

• ATSAMD21G18 @ 48 MHz – ARM Cortex M0, 3.3V logic
• 256KB Flash + 32KB RAM – No EEPROM
• Native USB – Built-in USB bootloader and serial port debugging
• MicroSD Card Holder – For extensive data storage and reading
• 20 GPIO Pins – Including 10 analogue inputs and 8 PWM outputs
• Hardware Serial, I2C & SPI – Full peripheral support
• Built-in LiPo Charger – 100 mA charging with status indicator LED
• Battery Monitoring – Battery voltage routed to an analogue pin via divider
• 3.3V Regulator – 500 mA peak current output
• Pin #8 Green LED – Additional LED for logging status indication
• Pin #13 Red LED – General-purpose blinking

Specifications

• Dimensions – 51 × 23 × 8 mm (without headers)
• Weight – 5.3 g
• Mounting – 4 mounting holes

Also Available

• Feather M0 Basic Proto – With prototyping area
• Feather M0 Bluefruit LE – With Bluetooth Low Energy
• Feather M0 Express – Designed for CircuitPython
• Feather M0 WiFi – With ATWINC1500 Wi-Fi
• Feather M0 RFM95 LoRa Radio (900 MHz)
• Feather M0 RFM69HCW Packet Radio (868/915 MHz)

Ideal For

• Portable data logging and environmental monitoring
• Sensor data recording to MicroSD card
• Battery-powered field deployments
• Projects requiring more memory than ATmega-based Feathers

Package Contents

• 1× Assembled and tested Feather M0 Adalogger
• 1× Header set