Adafruit
Adafruit Feather 32u4 Adalogger
Best portable solution for remote sensor data logging projects.
Meet the Adafruit Feather 32u4 Adalogger, your go-to solution for portable, all-in-one data logging built on the popular Feather form factor. This lightweight board features the ATmega32u4 microcontroller running at 8 MHz with 3.3V logic, offering 32KB of flash and 2KB of RAM. It supports native USB, allowing it to emulate devices like keyboards or mice. Crucially for logging, it includes a MicroSD card holder for massive storage capacity. For portability, it integrates a connector and charger for 3.7V Lithium Polymer batteries, automatically switching to USB power when connected. It's fully assembled and ready for use with the Arduino IDE.
$24.95
Owner Satisfaction
4.7
/ 5
Category Rank
28
/ 1543
#28 in Development Boards
Price vs Category Average
-72%
Below average
Processor
3248
/ ATmegau clocked at MHz
Who it's for
- Researchers needing simple, reliable sensor data collection
- Field engineers building long-term, battery-powered remote devices
- Makers leveraging the vast Adafruit FeatherWing ecosystem
Who should skip it
- Users demanding high-speed, integrated flash storage performance
- Developers requiring high-speed processing or complex calculations
- IoT hobbyists needing built-in wireless connectivity
Performance breakdown
Portability
Feather form factor makes this ideal for compact, wearable data projects.
Logging Capability
Integrated MicroSD slot provides massive storage for long-term field data collection.
Power Management
Built-in LiPo charging simplifies battery-powered deployments without extra hardware.
Processing Power
The 8 MHz clock speed is sufficient for logging but limits complex calculations.
Connectivity
Native USB support allows for easy device emulation and straightforward programming.
Ease of Integration
Arduino IDE compatibility ensures a smooth setup for beginners and pros alike.
Key Specs
Processor
ATmega32u4 clocked at 8 MHz
Memory
32 KB Flash, 2 KB RAM
Operating Voltage
3.3V logic level
Digital I/O Pins
20 total (7 PWM channels)
Analog Inputs
10 channels
Storage
MicroSD card supported
Dimensions
51 mm x 23 mm x 8 mm
Weight
5.1 grams
Features
- All-in-one datalogger with built-in storage
- Integrated LiPo battery charging circuit
- Feather form factor for portability
- Native USB support for device emulation
- 20 accessible GPIO pins
- Includes both red and green status LEDs
- Hardware support for I2C, SPI, and UART
- Lightweight design at only 5.1 grams
What customers say
The Adafruit Feather 32u4 Adalogger earns high praise for its compact size and exceptional reliability in data logging. Users value the small form factor, perfect for space constrained and wearable projects. Its integrated design, featuring the ATmega32u4, an SD card slot, and a Real Time Clock, simplifies development by eliminating external wiring. The robust Adafruit libraries further lower the entry barrier for implementation. While the processor is less powerful than newer options, this is accepted as a worthwhile trade-off for its excellent low power performance, making it ideal for battery operation. Overall, the Adalogger is celebrated for delivering high quality and dependable execution of its core data acquisition mission.
Know before you buy
Yes, the Adalogger is designed specifically for standalone use. The integrated MicroSD card slot allows you to save data locally, and the built-in LiPo battery charger lets you power the board with a battery for portable, off-grid projects.
Absolutely. The board is fully compatible with the Arduino IDE, making it easy to upload code and manage your projects using familiar libraries and tools.
The board includes a connector for a 3.7V Lithium Polymer (LiPo) battery. It features an onboard charging circuit that automatically switches to USB power whenever you plug the board into your computer.
Yes, the ATmega32u4 features native USB support. This allows the board to emulate a HID (Human Interface Device) such as a keyboard or mouse, which is useful for automation or custom input projects.
The board operates at 3.3V, which is the standard for most modern sensors and modules. If you are using older components that require 5V logic, you may need a logic level shifter to prevent damage to the board.
You have access to 20 GPIO pins in total. This includes 7 PWM channels for motor or LED control and 10 analog input channels for reading sensors.
Still have a question?
Ask Hayley anything about this product before you decide.