Circuit Playground Bluefruit

by Adafruit

Image of Board

Circuit Playground Bluefruit is our third board in the Circuit Playground series, another step towards a perfect introduction to electronics and programming. We’ve taken the popular Circuit Playground Express and made it even better! Now the main chip is an nRF52840 microcontroller which is not only more powerful, but also comes with Bluetooth Low Energy support for wireless connectivity.

This product is ALPHA hardware at this time, for use by folks who are going to be developing software to support it - it’s not quite ready for student/beginner use!

The board is round and has alligator-clip pads around it so you don’t have to solder or sew to make it work. You can power it from USB, a AAA battery pack, or with a Lipoly battery (for advanced users). Circuit Playground Bluefruit has built-in USB support. Built in USB means you plug it in to program it and it just shows up, no special cable or adapter required. Just program your code into the board then take it on the go!

Features:

  • 1 x nRF52840 Cortex M4 processor with Bluetooth Low Energy support
  • 10 x mini NeoPixels, each one can display any color
  • 1 x Motion sensor (LIS3DH triple-axis accelerometer with tap detection, free-fall detection)
  • 1 x Temperature sensor (thermistor)
  • 1 x Light sensor (phototransistor). Can also act as a color sensor and pulse sensor.
  • 1 x Sound sensor (MEMS microphone)
  • 1 x Mini speaker with class D amplifier (7.5mm magnetic speaker/buzzer)
  • 2 x Push buttons, labeled A and B
  • 1 x Slide switch
  • 8 x alligator-clip friendly input/output pins
  • Includes I2C, UART, 6 pins that can do analog inputs, multiple PWM outputs
  • Green “ON” LED so you know its powered
  • Red “#13” LED for basic blinking
  • Reset button
  • 2 MB of SPI Flash storage, used primarily with CircuitPython to store code and libraries.
  • MicroUSB port for programming and debugging
  • USB port can act like serial port, keyboard, mouse, joystick or MIDI!

Tutorials

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Have some info to add for this board? Edit the source for this page here.

CircuitPython 5.3.1

This is the latest stable release of CircuitPython that will work with the Circuit Playground Bluefruit.

Start here if you are new to CircuitPython.

Release Notes for 5.3.1

CircuitPython 6.0.0-rc.0

This is the latest unstable release of CircuitPython that will work with the Circuit Playground Bluefruit.

Unstable builds have the latest features but are more likely to have critical bugs.

Release Notes for 6.0.0-rc.0

Built-in modules available: _bleio, _pixelbuf, aesio, analogio, audiobusio, audiocore, audiomixer, audiomp3, audiopwmio, bitbangio, board, busio, digitalio, displayio, framebufferio, gamepad, math, microcontroller, neopixel_write, nvm, os, pulseio, pwmio, random, rgbmatrix, rotaryio, rtc, sdcardio, sharpdisplay, storage, struct, supervisor, terminalio, time, touchio, ulab, usb_hid, usb_midi, vectorio, watchdog

Absolute Newest

Every time we commit new code to CircuitPython we automatically build binaries for each board and language. The binaries are stored on Amazon S3, organized by board, and then by language. Try them if you want the absolute latest and are feeling daring or want to see if a problem has been fixed.

Past Releases

All previous releases are listed on GitHub, with release notes, and are available for download from Amazon S3. They are handy for testing, but otherwise we recommend using the latest stable release. Some older GitHub release pages include the same binaries for downloading. But we have discontinued including binaries as assets on newer release pages because of the large number of files for each release.

BROWSE GITHUB

UF2 Bootloader

Latest version: 0.3.2

The bootloader allows you to load CircuitPython, Makecode, and Arduino programs. The bootloader is not CircuitPython. You can check the current version of your bootloader by looking in the INFO_UF2.TXT file when the BOOT drive is visible (FEATHERBOOT, CPLAYBOOT, etc.).

Updating the bootloader on nRF52840 boards is an involved process right now. Follow the instructions in this README. It is not necessary to update on each release if your bootloader is working fine. Read the release notes on GitHub to see what has been changed.

After you update, check INFO_UF2.TXT to verify that the bootloader version has been updated. Then you will need to reload CircuitPython.