Adafruit Feather 32u4 Bluefruit LE Development Board

Adafruit Feather 32u4 Bluefruit LE is an all-in-one Arduino-compatible + BLUETOOTH® Low Energy development board with built-in USB and battery charging. The board features the ATmega32u4 clocked at 8MHz and at 3.3V logic. The development board's chip offers 32K of flash, 2K of RAM, and built-in USB. The built-in USB provides a USB-to-Serial program and debug capability. To support portable projects, the board includes a connector for Adafruit 3.7V lithium polymer batteries and built-in battery charging.

The board also features the Bluefruit BTLE module and two status indicator LEDs. Bluefruit serves as a data pipe to transparently transmit back and forth from the iOS or Android device. Designers can use Adafruit’s iOS App, Android App. They can also write their own app to communicate with the UART service. Thanks to an easy-to-learn AT command set, designers have full control over how the device behaves. This includes the ability to define and manipulate GATT Services and Characteristics. Full control also includes the ability to change the way that the device identifies itself to other Bluetooth Low Energy devices. Designers can also use the AT commands to query the die temperature, check the battery voltage, and more.