Adafruit Feather 32u4 Adalogger

The Adafruit Feather 32u4 Adalogger is a compact, lightweight development board designed as an all-in-one datalogger with built-in USB and battery charging capabilities. Featuring an ATmega32u4 microcontroller clocked at 8 MHz with 3.3V logic, it combines the functionality of the Feather 32u4 with an onboard microSD card holder for expansive data storage.

Key features include:

• Dimensions: 2.0" x 0.9" x 0.28" (51mm x 23mm x 8mm)
• Weight: 5.1 grams
• ATmega32u4 CPU @ 8MHz, 3.3V logic
• 3.3V regulator supporting 500mA peak current output
• Native USB support with built-in bootloader for Arduino IDE compatibility
• 20 GPIO pins including 7 PWM and 10 analog inputs
• Hardware Serial, I2C, and SPI interfaces
• 100mA LiPoly battery charger with status LED
• Battery connector for 3.7V Lithium Polymer batteries with analog battery voltage monitoring
• MicroSD card holder for data logging
• Pin #8 green LED for user-defined use, Pin #13 red LED for general purpose blinking
• Power/enable pin, reset button, and 4 mounting holes

The board runs from either USB power or a connected LiPoly battery, automatically switching between power sources and enabling portable project applications. It comes fully assembled and tested, with header pins included for soldering and breadboard compatibility. Lithium battery, microSD card, and USB cable are sold separately.

For detailed schematics, tutorials, and setup instructions, visit the Feather 32u4 Adalogger tutorial.