Feather 32u4 Adalogger Adafruit


The Feather 32u4 Adalogger belongs to the Adafruit Feather line of development boards. These feather boards are known for being thin and light, just like a feather! These devices are the reason for a whole ecosystem of sensors and other microcontroller board peripherals, much like the Arduino UNO.

The Feather 32u4 Adalogger records data from instruments and sensors to an onboard microSD. It is based on an Atmega 32u4 chip with a 8MHz and 3.3V logic setup, a build common to these feather devices. For power, it has a builtin USB and JST connector. When both are connected, the board uses USB power. Further, the board has 20 GPIO pins with hardware serial, I2C, and SPI support. Among these 20 pins are 8 PWM and 10 analog pins, which are useful for interfacing various kinds of sensors. 

To upload a program to the Feather 32u4 Adalogger, simply plug the board to a USB 2.0 or USB 3.0 socket and install the board library below to the Arduino IDE. 


  • Measures 2.0″ x 0.9″ x 0.28″ (51mm x 23mm x 8mm) without headers soldered in
  • Light as a (large?) feather – 5.1 grams
  • ATmega32u4 @ 8MHz with 3.3V logic/power
  • 3.3V regulator with 500mA peak current output
  • USB native support, comes with USB bootloader and serial port debugging
  • You also get tons of pins – 20 GPIO pins
  • Hardware Serial, hardware I2C, hardware SPI support
  • 8 x PWM pins
  • 10 x analog inputs
  • Built in 100mA lipoly charger with charging status indicator LED
  • Pin #13 red LED for general purpose blinking
  • Power/enable pin
  • 4 mounting holes
  • Reset button


Copy to this to File > Preferences > Boards Manager URL: https://adafruit.github.io/arduino-board-index/package_adafruit_index.json


  • 1 x Feather 32u4 Adalogger Adafruit
  • 2 x Male header pins


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