Adafruit Bluefruit LE Micro - Bluetooth Low Energy + ATmega32u4

The Adafruit Bluefruit LE Micro combines an ATmega32u4 microcontroller with a Bluetooth Low Energy (BLE) module in a compact, breadboard-friendly form factor. Program over USB using the Arduino IDE, then communicate wirelessly with iOS and Android devices — no special certification required for iOS connectivity.

The onboard nRF51822 BLE module supports the Nordic UART profile for transparent data transfer, AT commands for full BLE configuration, custom GATT services and characteristics, HID keyboard emulation, heart rate monitor profiles, and UriBeacon support. Over-the-air firmware updates keep the BLE module current.

Key Features

• ATmega32u4 Microcontroller – 28 KB flash, 2 KB RAM, 8 MHz, 3.3V logic, USB bootloader
• nRF51822 BLE Module – Bluetooth Low Energy with Nordic UART RX/TX profile
• 20+ GPIO Pins – Including I2C, SPI, UART, and 6 analogue inputs
• USB Programming – Arduino IDE compatible (same as Flora / Arduino Leonardo)
• AT Command Set – Full control over BLE behaviour, GATT services, advertising, and more
• HID Keyboard – Emulate a Bluetooth keyboard for BLE HID-capable devices
• UriBeacon – Broadcast URLs to nearby devices
• OTA Firmware Updates – Update BLE module firmware via iOS or Android
• iOS and Android Compatible – Works with the free Bluefruit Connect app

Also Available

• Bluefruit LE SPI Friend – Add BLE to any microcontroller via SPI
• Bluefruit LE Shield – Arduino shield form factor for easy plug-in BLE

Ideal For

• Wireless communication with iOS and Android devices
• BLE-enabled robots, wearables, and art projects
• Portable Bluetooth HID keyboard projects
• BLE beacon and proximity applications

Package Contents

• 1× Adafruit Bluefruit LE Micro (assembled and tested)
• 1× Header strip set