- ATmega32u4 clocked at 8 MHz and at 3.3V logic - same chip setup as the Flora
- USB native support, built in USB bootloader and serial port debugging - no need for an FTDI-like chip
- It can also act like a mouse, keyboard, USB MIDI device, etc.
- Hardware Serial, hardware I2C, hardware SPI support
This is the Adafruit Feather 32u4 Bluefruit - an 'all-in-one' Arduino-compatible + Bluetooth Low Energy with built in USB and battery charging. Its an Adafruit Feather 32u4 with a BTLE module. Bluetooth Low Energy is the hottest new low-power, 2.4GHz spectrum wireless protocol. In particular, its the only wireless protocol that you can use with iOS without needing special certification and it's supported by all modern smart phones. This makes it excellent for use in portable projects that will make use of an iOS or Android phone or tablet. It also is supported in Mac OS X and Windows 8+.
To make it easy to use for portable projects, it has a 3.7V Lithium polymer battery connector and built in battery charging. You don't need a battery, it will run just fine straight from the micro USB connector. But, if you do have a battery, you can take it on the go, then plug in the USB to recharge. The Feather will automatically switch over to USB power when its available. We also tied the battery thru a divider to an analog pin, so you can measure and monitor the battery voltage to detect when you need a recharge.
3.3V regulator with 500mA peak current output
20 GPIO pins
7 x PWM pins
10 x analog inputs
Built in 100mA lipoly charger with charging status indicator LED
Pin #13 red LED (general purpose blinking)
4 mounting holes
Size: 2" x 0.9" x 0.28"