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Small rectangular green circuit board with micro USB port and battery connector

Adafruit

Adafruit Feather 32u4 Bluefruit LE engineering development tool

SKU CH-7VR2-1EWKF

An Arduino-compatible microcontroller board with built-in Bluetooth Low Energy, USB, and 3.7 V LiPo battery charging for portable wireless projects

  • Product typeEngineering Development Tools
  • Arduino-compatible development with ATmega32u4 at 8 MHz
  • Native USB bootloader and serial debugging without extra hardware
  • Bluetooth Low Energy at 2.4 GHz for iOS and Android projects
  • Built-in Li-Po charging from 3.7 V connector for portable power
  • Hardware Serial, I2C and SPI support for sensor integration

Arduino-compatible board with Bluetooth Low Energy

The Adafruit Feather 32u4 Bluefruit LE combines an ATmega32u4 running at 8 MHz and 3.3V logic with integrated Bluetooth Low Energy on the 2.4 GHz spectrum. It targets makers building portable projects that communicate with iOS, Android, macOS or Windows 8+ devices without special certification. USB native support provides a built-in bootloader and serial debugging without an extra FTDI-style chip. The board also functions as a USB mouse, keyboard or MIDI device.

Battery charging and hardware peripherals

A 3.7V lithium-polymer connector with on-board charging lets the board run untethered or directly from the micro-USB supply. Hardware serial, I2C and SPI are available for sensors, displays or other modules. These integrated peripherals remove the need for separate level-shifting or adapter boards in many portable designs. The Feather form factor keeps the layout compact for space-constrained enclosures.

Limits of the 8 MHz 3.3V platform

The 8 MHz clock and 3.3V logic restrict performance for compute-intensive tasks such as real-time audio processing or high-speed data logging. Bluetooth Low Energy throughput is bounded by the protocol and the 2.4 GHz radio, not by the USB interface. Projects needing more flash, RAM or CPU cycles will outgrow this board. Builds requiring 5V I/O or faster SPI clock rates need a different platform.

How it compares

Measured against everything we stock in Engineering Workstations & Dev Kits, at today’s prices. Recalculated every night.

Price $29.99
Pricier than about 80% of the 170 comparable items (median $11.49).

Specifications

Product
Product typeEngineering Development Tools

Questions about this item

Will the 3.7V Lithium polymer battery connector need a new battery after a few years of charge cycles?

The board includes a built-in charger for a 3.7V LiPo cell; the cell itself is a consumable and will eventually hold less charge, so plan to replace it when run-time drops.

What thermal limit appears first when the ATmega32u4 runs at 8 MHz continuously?

The 3.3V regulator feeding the processor is the first component to hit its thermal ceiling under sustained load, so keep the board ventilated.

How much heat and noise does the board produce when powered from USB all day?

It runs silently with no fan; the regulator and Bluetooth module warm slightly but stay comfortable to touch during continuous operation.

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