Adafruit Feather 32u4 Adalogger

Overview

The Adafruit Feather 32u4 Adalogger extends the Feather 32u4 Basic Proto with an onboard microSD card slot, transforming it into a self-contained data logging platform. Based on the ATmega32u4 at 8 MHz with 3.3V logic, it maintains the Feather's compact 51 × 23 mm footprint and 5.1g weight while adding persistent storage capabilities.

The microSD slot enables logging sensor readings, timestamps, and other data directly to removable storage without a computer. A green LED on pin 8 provides a status indicator alongside the standard red LED on pin 13. All other hardware specifications match the Feather 32u4 Basic Proto: 32KB flash, 2KB SRAM, 20 GPIO, 7 PWM, 10 analog inputs, hardware Serial/I2C/SPI, and native USB through the ATmega32u4.

Battery power is managed by an integrated 100mA LiPoly charger with a JST connector for standard 3.7V LiPo batteries. The 3.3V regulator provides 500mA peak output. Automatic switchover between USB and battery ensures continuous operation during field deployment.

The Adalogger is well suited for environmental monitoring, GPS tracking with SD logging, time-series data collection, and any project requiring long-term data capture in a portable, battery-powered form factor. It stacks with all standard FeatherWing accessories through the Feather header system.