{"title":"Adafruit Feather 32u4 Bluefruit LE with Stacking Headers - Assembled","handle":"adafruit-feather-32u4-bluefruit-le-with-stacking-headers-assembled","url":"/products/adafruit-feather-32u4-bluefruit-le-with-stacking-headers-assembled","description":"The Feather 32u4 Bluefruit LE with Stacking Headers combines an ATmega32u4 microcontroller with a Bluetooth Low Energy module, USB connectivity, and LiPo battery charging — with stacking headers pre-soldered so you can plug into a breadboard and stack FeatherWings on top.\n\nThe Bluefruit module is built on the Nordic nRF51822 chipset and supports transparent UART serial communication, custom GATT services, HID keyboard emulation, UriBeacon broadcasting, and over-the-air firmware updates. BLE is supported by all modern smartphones and tablets (iOS, Android, Mac OS X, Windows 8+).\n\nKey Features\n\n\nATmega32u4 @ 8 MHz – 3.3V logic, 32KB flash, 2KB RAM\n\nNative USB – Built-in USB bootloader, serial debugging, and HID device support\n\nBluetooth Low Energy (nRF51822) – iOS and Android compatible\n\nPre-Soldered Stacking Headers – Ready for breadboard use and FeatherWing stacking\n\nUART Service – Transparent serial data pipe between BLE device and microcontroller\n\nAT Command Set – Full control over BLE behaviour, GATT services, and advertising\n\nBLE HID Keyboard – Act as a wireless keyboard for compatible devices\n\nOver-the-Air Updates – Update BLE module firmware via iOS or Android\n\n20 GPIO Pins – Including 10 analogue inputs and 8 PWM outputs\n\nHardware Serial, I2C & SPI – Full peripheral support\n\nBuilt-in LiPo Charger – 100 mA charging with status indicator LED\n\nBattery Monitoring – Battery voltage routed to an analogue pin via divider\n\n3.3V Regulator – 500 mA peak current output\n\n\nSpecifications\n\n\nDimensions – 51 × 23 × 8 mm (without headers)\n\nWeight – 5.7 g\n\nMounting – 4 mounting holes\n\n\nAlso Available\n\n\nFeather 32u4 Bluefruit LE – Without headers\nFeather 32u4 Bluefruit LE – With Standard Headers\n\nFeather 32u4 Adalogger – With MicroSD card holder\n\nFeather 32u4 Basic Proto – With prototyping area\n\nFeather 32u4 FONA – With cellular connectivity\n\n\nIdeal For\n\nFeatherWing-based BLE projects\nPhone-controlled projects via iOS or Android\nWireless sensor data transmission\nBLE HID keyboards and controllers\n\n\nPackage Contents\n\n1× Assembled and tested Feather 32u4 Bluefruit LE with pre-soldered stacking headers\n\n\n\nNote: LiPo battery and USB cable are sold separately.\n","vendor":"Adafruit","product_type":"physical","in_stock":true,"options":[],"variants":[{"id":8357,"title":"Default Title","sku":"AF-3242","price":66.88,"on_sale":false,"in_stock":true,"available_quantity":37,"option1":"Default Title"}]}