# Adafruit Feather 32u4 Bluefruit LE
## Overview
Feather is the new development board from Adafruit, and like it's namesake it is thin, light, and lets you fly! We designed Feather to be a new standard for portable microcontroller cores.
This is the **Adafruit Feather 32u4 Bluefruit** - our take on 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, ready to rock! [We have other boards in the Feather family, check'em out here](https://www.adafruit.com/categories/777)
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+
At the Feather 32u4's heart is at ATmega32u4 clocked at 8 MHz and at 3.3V logic, a chip setup we've had tons of experience with as [it's the same as the Flora](https://www.adafruit.com/product/659). This chip has 32K of flash and 2K of RAM, with built in USB so not only does it have a USB-to-Serial program & debug capability built in with no need for an FTDI-like chip, it can also act like a mouse, keyboard, USB MIDI device, etc.
To make it easy to use for portable projects, we added a connector for any of our 3.7V Lithium polymer batteries 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.
Here's some handy specs! Like all Feather 32u4's you get:
- Measures 2.0" x 0.9" x 0.28" (51mm x 23mm x 8mm) without headers soldered in
- Light as a (large?) feather - 5.7 grams
- ATmega32u4 @ 8MHz with 3.3V logic/power
- 3.3V regulator with 500mA peak current output
- USB native support, comes with USB bootloader and serial port debugging
- You also get tons of pins - 20 GPIO pins
- Hardware Serial, hardware I2C, hardware SPI support
- 7 x PWM pins
- 10 x analog inputs
- Built in 100mA lipoly charger with charging status indicator LED
- Pin #13 red LED for general purpose blinking
- Power/enable pin
- 4 mounting holes
- Reset button
The **Feather 32u4 Bluefruit LE** uses the extra space left over to add our excellent Bluefruit BTLE module + two status indicator LEDs
**The Power of Bluefruit LE**
The Bluefruit LE module is an nRF51822 chipset from Nordic, programmed with multi-function code that can do quite a lot! For most people, they'll be very happy to use the standard Nordic UART RX/TX connection profile. In this profile, the Bluefruit acts as a data pipe, that can 'transparently' transmit back and forth from your iOS or Android device. You can use our [iOS App](../../../../bluefruit-le-connect-for-ios) or [Android App](https://play.google.com/store/apps/details?id=com.adafruit.bluefruit.le.connect&hl=en), or [write your own to communicate with the UART service](../../../../introducing-the-adafruit-bluefruit-le-uart-friend/uart-service).
The board is capable of much more than just sending strings over the air! Thanks to an easy to learn [AT command set](../../../../introducing-the-adafruit-bluefruit-le-uart-friend/command-mode-1), you have full control over how the device behaves, including the ability to define and manipulate your own [GATT Services and Characteristics](../../../../introducing-the-adafruit-bluefruit-le-uart-friend/ble-gatt), or change the way that the device advertises itself for other Bluetooth Low Energy devices to see. You can also use the AT commands to query the die temperature, check the battery voltage, and more, check the connection RSSI or MAC address, and tons more. Really, way too long to list here!
**Use the Bluefruit App to get your project started**
Using our Bluefruit [iOS App](../../../../bluefruit-le-connect-for-ios) or [Android App](https://play.google.com/store/apps/details?id=com.adafruit.bluefruit.le.connect&hl=en), you can quickly get your project prototyped by using your iOS or Android phone/tablet as a controller. We have a [color picker](../../../../bluefruit-le-connect-for-ios/controller#color-picker), [quaternion/accelerometer/gyro/magnetometer or location (GPS)](../../../../bluefruit-le-connect-for-ios/controller#sensors), and an 8-button [control game pad](../../../../bluefruit-le-connect-for-ios/controller#control-pad). This data can be read over BLE and piped into the ATmega32u4 chip for processing & control
**You can do a lot more too!**
- [The Bluefruit can also act like an HID Keyboard](../../../../introducing-the-adafruit-bluefruit-spi-breakout/hidkeyboard) (for devices that support BLE HID)
- [Can become a BLE Heart Rate Monitor](../../../../introducing-the-adafruit-bluefruit-spi-breakout/heartratemonitor) (a standard profile for BLE) - you just need to add the pulse-detection circuitry
- [Turn it into a UriBeacon](../../../../introducing-the-adafruit-bluefruit-spi-breakout/uribeacon), the Google standard for Bluetooth LE beacons. Just power it and the 'Friend will bleep out a URL to any nearby devices with the UriBeacon app installed.
- [Built in over-the-air bootloading capability so we can keep you updated with the hottest new firmware](../../../../introducing-the-adafruit-bluefruit-spi-breakout/dfu-updates). Use any Android or iOS device to get updates and install them. This will update the native code on the BLE module, to add new wireless capabilities, not program the ATmega chip.
Comes fully assembled and tested, with a USB bootloader that lets you quickly use it with the Arduino IDE. We also toss in some header so you can solder it in and plug into a solderless breadboard. **Lipoly battery, MicroSD card and USB cable not included** (but we do have lots of options in the shop if you'd like!)
- [Next Page](https://learn.adafruit.com/adafruit-feather-32u4-bluefruit-le/pinouts.md)
## Featured Products
### Adafruit Feather 32u4 Bluefruit LE
[Adafruit Feather 32u4 Bluefruit LE](https://www.adafruit.com/product/2829)
Feather is the new development board from Adafruit, and like its namesake it is thin, light, and lets you fly! We designed Feather to be a new standard for portable microcontroller cores.
This is the **Adafruit Feather 32u4 Bluefruit** - our take on an...
In Stock
[Buy Now](https://www.adafruit.com/product/2829)
[Related Guides to the Product](https://learn.adafruit.com/products/2829/guides)
### Stacking Headers for Feather - 12-pin and 16-pin female headers
[Stacking Headers for Feather - 12-pin and 16-pin female headers](https://www.adafruit.com/product/2830)
These two **Female Stacking Headers** alone are, well, lonely. But pair them with any of our [Feather](https://www.adafruit.com/categories/777) boards and you're in business!
What do they do? They stack. Put the headers through your Feather and then you can...
Out of Stock
[Buy Now](https://www.adafruit.com/product/2830)
[Related Guides to the Product](https://learn.adafruit.com/products/2830/guides)
### Lithium Ion Polymer Battery - 3.7v 100mAh
[Lithium Ion Polymer Battery - 3.7v 100mAh](https://www.adafruit.com/product/1570)
Lithium-ion polymer (also known as 'lipo' or 'lipoly') batteries are thin, light, and powerful. The output ranges from 4.2V when completely charged to 3.7V. This battery has a capacity of ~100mAh for a total of about 0.4 Wh. If you need a larger battery,
In Stock
[Buy Now](https://www.adafruit.com/product/1570)
[Related Guides to the Product](https://learn.adafruit.com/products/1570/guides)
### Lithium Ion Polymer Battery - 3.7v 150mAh
[Lithium Ion Polymer Battery - 3.7v 150mAh](https://www.adafruit.com/product/1317)
Lithium-ion polymer (also known as 'lipo' or 'lipoly') batteries are thin, light, and powerful. The output ranges from 4.2V when completely charged to 3.7V. This battery has a capacity of 150mAh for a total of about 0.6 Wh. If you need a larger battery,
In Stock
[Buy Now](https://www.adafruit.com/product/1317)
[Related Guides to the Product](https://learn.adafruit.com/products/1317/guides)
### Lithium Ion Polymer Battery - 3.7V 350mAh
[Lithium Ion Polymer Battery - 3.7V 350mAh](https://www.adafruit.com/product/2750)
Lithium-ion polymer (also known as 'lipo' or 'lipoly') batteries are thin, light, and powerful. The output ranges from 4.2V when completely charged to 3.7V. This battery has a capacity of 350mAh for a total of about 1.3 Wh. If you need a larger (or smaller!) battery,
In Stock
[Buy Now](https://www.adafruit.com/product/2750)
[Related Guides to the Product](https://learn.adafruit.com/products/2750/guides)
### Lithium Ion Polymer Battery - 3.7v 500mAh
[Lithium Ion Polymer Battery - 3.7v 500mAh](https://www.adafruit.com/product/1578)
Lithium-ion polymer (also known as 'lipo' or 'lipoly') batteries are thin, light, and powerful. The output ranges from 4.2V when completely charged to 3.7V. This battery has a capacity of 500mAh for a total of about 1.9 Wh. If you need a larger (or smaller!) battery,
In Stock
[Buy Now](https://www.adafruit.com/product/1578)
[Related Guides to the Product](https://learn.adafruit.com/products/1578/guides)
## Related Guides
- [My Mini Race Car](https://learn.adafruit.com/my-mini-race-car.md)
- [Wireless UNTZtrument Using BLE MIDI ](https://learn.adafruit.com/wireless-untztrument-using-ble-midi.md)
- [3D Printed Case for Adafruit Feather](https://learn.adafruit.com/3d-printed-case-for-adafruit-feather.md)
- [Build a Bluetooth App using Swift 5](https://learn.adafruit.com/build-a-bluetooth-app-using-swift-5.md)
- [What is Web MIDI & BLE MIDI?](https://learn.adafruit.com/web-ble-midi.md)
- [How to Choose a Microcontroller](https://learn.adafruit.com/how-to-choose-a-microcontroller.md)
- [Introducing Adafruit Feather](https://learn.adafruit.com/adafruit-feather.md)
- [Bluetooth Controlled NeoPixel Headphones](https://learn.adafruit.com/bluetooth-controlled-neopixel-headphones.md)
- [Bluetooth LE MIDI Controller](https://learn.adafruit.com/bluetooth-le-midi-controller.md)
- [Festive Feather Holiday Lights](https://learn.adafruit.com/festive-feather-holiday-lights.md)
- [BLE Feather Lamp](https://learn.adafruit.com/ble-feather-lamp.md)
- [3D Printed Daft Punk Helmet with Bluetooth ](https://learn.adafruit.com/3d-printed-daft-punk-helmet-with-bluetooth.md)
- [Schluff - The Sleep Monitor](https://learn.adafruit.com/schluff-the-oshw-sleep-monitor.md)
- [Using Bluefruit BLE to Give Disabled Users Switch Control Access to IOS Devices](https://learn.adafruit.com/ios-switch-control-using-ble.md)
- [Getting Started with MyoWare Muscle Sensor](https://learn.adafruit.com/getting-started-with-myoware-muscle-sensor.md)