Feather Bluefruit LE 4.1 32u4 - compatible with Arduino - Adafruit 2829

Index: ADA-06566 EAN: 5904422354428

A small module with a microcontroller AVR Atmega 32u4 known from the Arduino Leonardo known from Bluetooth BLE 4.1. Feather is designed for portable projects. On board is also a microUSB connector, through which the system can be programmed via the Arduino IDE environment.

Feather Bluefruit LE 4.1 32u4 - compatible with Arduino - Adafruit 2829
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Discontinued product
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Manufacturer: Adafruit


The product has been discontinued. Check other products in category.


A small module with a microcontroller AVR Atmega 32u4. Feather is designed for portable projects. Thanks to the microUSB connector and uploaded bootloader, the module can be programmed directly fromthe Arduino IDE environment. Board has a small size (51 x 23 x 8 mm) can be powered by voltage from USB port or from rechargeable Li-Pol battery3,7 V Li-Pol. The module has built-in Bluetooth 4.1 BLE, so it can become the wireless control center.


Check out how to start playing with the Adafruit Feather!


Mobile projects

Controller Feather is designed for mobile projects. Thanks to the integrated connector, it is possible to power it from the rechargeable Li-Pol battery3.7 V. The battery voltage was led through an analog pin, so you can constantly monitor the state of charge of the lipol. Also available is powering from the microUSB port.

Feather 32u4 Bluefruit LE 4.1

Programming (Arduino IDE)

The module can be programmed using the Arduino IDE. For this, you will need to configure the software in a wayprovided by the manufacturerand connect the board using the microUSB cable.The settings of the Arduino IDE are available on the website of the manufacturer.

The manufacturer also provides software for smartphones to communicate with the module:


  • Supply Voltage: Li-Pol 3.7 V or USB 5 V slot
  • Microcontroller AVR Atmega32u4 3.3 V:
    • Flash memory: 32 KB (2.75 kB of which is occupied by the bootloader)
    • SRAM: 2 KB
    • Clock frequency: internal oscillator 8 MHz
  • Built-in Bluetooth BLE 4.1
  • Driver: Bluetooth systemNordic nRF51822
  • Installed Arduino bootloader
  • Works with a modified version of theArduino IDE
  • ConnectormicroUSBfor programming, in our assortment, you will find the necessary wire
  • Installed 3.3 V voltage regulator with current delivery up to 500 mA
  • Power supply from USB port or with a Li-Pol battery 3.7 V
  • 20 GPIO pins
  • 8 PWM pins 
  • 10 analog inputs (one for the battery voltage measurement)
  • Interfaces: UART, I2C, SPI
  • Built-in lipol charging module 100 mA with LED indicator, which informs about the status
  • LED for pin 13
  • The reset button
  • Included are goldpin strips for self-soldering
  • Dimensions: 51 x 23 x 8 mm
  • Weight: approx 5.7 g


Voltage to 5.0 V
Voltage from 5.0 V
Voltage output from 3.3 V
Output voltage to 3.3 V
Nominal output voltage 3.3 V
UC - Microcontroller Atmega32U4
UC - Core 8-bit AVR
UC - Flash 32 kB
UC - RAM 2 kB
UC - core 1. Single Core
UC - Digital pins 20
UC - analog in 10
UC - freq 8 MHz
UC - PWM 8
UC - USB microUSB
UC - Bluetooth yes
UC - I2C yes
UC - UART yes
UC - SPI interface yes
Package width 10.5 cm
Package height 1.7 cm
Package depth 4 cm
Package weight 0.01 kg

Same-day shipping

  • Crediting the payment for the order on our account on a business day before 10:00 AM means sending the goods on the same day.
  • All packages are being delivered by GLS Group courier and covered with insurance up to 1200 EUR.
  • You will receive a link to track your package and monitor the progress of delivery as soon as it is shipped.

Terms of delivery 

GLS - zone 1

Austria, Belgium, Croatia, The Czech Republic, Denmark, Germany, Netherlands, Poland, Slovakia 

  • Delivery time: 2-4 days
  • Delivery cost: from 4.18 EUR
  • Insurance: 1200 EUR
GLS - zone 2

Bulgaria, Estonia, France, Hungary, Italy, Latvia, Lithuania, Luxembourg, Portugal, Romania, San Marino, Slovenia

  • Delivery time: 2-5 days
  • Delivery cost: from 5.35 EUR
  • Insurance: 1200 EUR
GLS - zone 3

Finland, Greece, Ireland, Spain, Sweden 

  • Delivery time: 2-7 days
  • Delivery cost: from 7.67 EUR
  • Insurance: 1200 EUR

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