Adafruit Feather 32u4 Bluefruit LE with Stacking Headers

The Adafruit Feather 32u4 Bluefruit combines an Arduino-compatible ATmega32u4 microcontroller with Bluetooth® Low Energy capabilities. It's perfect for projects involving iOS, Android, Mac OS X, or Windows devices due to its seamless BTLE integration and USB functionality.

Specifications: Measures 51mm x 23mm x 8mm, weighing 5.7 grams, with 20 GPIO pins, and multiple hardware supports (Serial, I2C, SPI). Features a built-in 100mA LiPo charger with status LED and an array of analog and PWM pins.

Benefits include USB bootloader, battery charging, and advanced Bluetooth functionalities. Use with iOS/Android apps for a spectrum of applications: from HID keyboards to BLE heart rate monitors. Analog pin lets you monitor battery life, ensuring seamless transitions between power sources.

The Bluefruit LE module provides full control with an AT command set, facilitating custom GATT Services and Bluetooth device interactions. Effortlessly expand project capabilities using the Bluefruit iOS or Android app for instant prototyping and control.