# Adafruit Feather Bluefruit Sense

Contents

- Adafruit Feather Bluefruit Sense

  - Hardware

  - Configuration

  - Uploading

  - Debugging

  - Frameworks

## Hardware

Platform Nordic nRF52: The nRF52 Series are built for speed to carry out increasingly complex tasks in the shortest possible time and return to sleep, conserving precious battery power. They have a Cortex-M4F processor and are the most capable Bluetooth Smart SoCs on the market.

Microcontroller | NRF52840
Frequency | 64MHz
Flash | 796KB
RAM | 243KB
Vendor | Adafruit

## Configuration

Please use `adafruit_feather_nrf52840_sense` ID for board option in “platformio.ini” (Project Configuration File):

    [env:adafruit_feather_nrf52840_sense]
    platform = nordicnrf52
    board = adafruit_feather_nrf52840_sense

You can override default Adafruit Feather Bluefruit Sense settings per build environment using `board_***` option, where `***` is a JSON object path from board manifest adafruit_feather_nrf52840_sense.json. For example, `board_build.mcu`, `board_build.f_cpu`, etc.

    [env:adafruit_feather_nrf52840_sense]
    platform = nordicnrf52
    board = adafruit_feather_nrf52840_sense

    ; change microcontroller
    board_build.mcu = nrf52840

    ; change MCU frequency
    board_build.f_cpu = 64000000L

## Uploading

Adafruit Feather Bluefruit Sense supports the next uploading protocols:

- `jlink`

- `nrfjprog`

- `nrfutil`

- `stlink`

Default protocol is `nrfutil`

You can change upload protocol using upload_protocol option:

    [env:adafruit_feather_nrf52840_sense]
    platform = nordicnrf52
    board = adafruit_feather_nrf52840_sense

    upload_protocol = nrfutil

## Debugging

PIO Unified Debugger - “1-click” solution for debugging with a zero configuration.

Warning

You will need to install debug tool drivers depending on your system. Please click on compatible debug tool below for the further instructions and configuration information.

You can switch between debugging Tools & Debug Probes using debug_tool option in “platformio.ini” (Project Configuration File).

Adafruit Feather Bluefruit Sense does not have on-board debug probe and IS NOT READY for debugging. You will need to use/buy one of external probe listed below.

Compatible Tools | On-board | Default
--- | --- | ---
J-LINK |  | Yes
ST-LINK |  |

## Frameworks

Name | Description
--- | ---
Arduino | Arduino Wiring-based Framework allows writing cross-platform software to control devices attached to a wide range of Arduino boards to create all kinds of creative coding, interactive objects, spaces or physical experiences.