CLUE NRF52840 Express

by Adafruit

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We wanted to build some projects that have a small screen and a lot of sensors. This board has a 1.3″ 240×240 IPS TFT display, two buttons, and a ton of sensors:

LSM series 9-DoF motion - LSM6DS33 Accel/Gyro + LIS3MDL magnetometer APDS9960 Proximity, Light, RGB, and Gesture Sensor PDM Microphone sound sensor Humidity, temperature and barometric environmental sensing There’s a Qwiic / STEMMA QT connector for adding more sensors, like PM2.5 air quality and others that were too big to fit on the board.

We’ll be primarily using CircuitPython for programming it, but it will also work in Arduino. And of course, we’d love to see MakeCode on it!

After designing it, the board was close enough to micro:bit-shape-size that we moved a few parts to make it fit in micro:bit robots and some projects – the nrf52840 is a big upgrade chip and can do stuff like Tensorflow Lite for Microcontrollers, BLE central and peripheral, and more.

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CircuitPython 5.3.0

This is the latest stable release of CircuitPython that will work with the CLUE NRF52840 Express.

Start here if you are new to CircuitPython.

Release Notes for 5.3.0

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, random, rgbmatrix, rotaryio, rtc, storage, struct, supervisor, time, touchio, ulab, usb_hid, usb_midi, vectorio, watchdog

CircuitPython 6.0.0-alpha.1

This is the latest unstable release of CircuitPython that will work with the CLUE NRF52840 Express.

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

Release Notes for 6.0.0-alpha.1

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, random, rgbmatrix, rotaryio, rtc, sdcardio, storage, struct, supervisor, 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.

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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.