Adafruit Bluefruit LE UART Friend - Bluetooth Low Energy (BLE)

The Adafruit Bluefruit LE UART Friend is a compact Bluetooth Low Energy (BLE) module designed to add reliable wireless connectivity to your projects. Using a simple UART interface with hardware flow control (CTS/RTS), it can be easily integrated with Arduino, Raspberry Pi, or other microcontrollers. With the powerful AT command set, you can configure GATT services, advertising packets, and access features like signal strength, battery level, and sensor data.

The module supports BLE HID profiles, enabling it to act as a keyboard, mouse, or game controller. It can also function as a URI Beacon, making it ideal for IoT applications. Adafruit provides free iOS and Android apps to interact with the module, offering features such as joystick control, buttons, color picker, and sensor monitoring. With its built-in OTA bootloader, the firmware can be updated wirelessly, ensuring flexibility and long-term support.

Key features

• Bluetooth Low Energy (BLE) module with UART interface
• Hardware flow control with CTS/RTS support
• AT command set for easy configuration
• BLE HID profiles: keyboard, mouse, gamepad
• URI Beacon support for IoT applications
• OTA bootloader for wireless firmware updates
• Compatible with Adafruit iOS and Android apps
• Works seamlessly with Arduino, Raspberry Pi, and other microcontrollers

Technical specifications

• Interface: UART (RX/TX), CTS/RTS flow control
• Microcontroller: ARM Cortex-M0, 16 MHz, 32 KB SRAM, 256 KB Flash
• Operating voltage: 3.3 V via on-board regulator
• Supported features: AT commands, BLE HID, URI Beacon, OTA updates
• Dimensions: approx. 32 × 21 × 5 mm
• Weight: approx. 3.5 g