the GitHub release page:
4.0.0 is the latest major revision of CircuitPython and features support for the nRF52840 BLE chipset, display support and translated messages.
This is the first alpha release of 4.0.0. Alpha releases
do not have the complete API from 3.x on the nRF builds and are only meant for testing. (Beta release will have the full existing API but still need work.) Please use the latest stable release when first starting with CircuitPython. It is stable.
When you find a bug please
check the current known issues and file an issue if something isn’t already known. Installation
To install follow the instructions in our new
Welcome to CircuitPython! guide. To install the latest libraries, see this page in that guide.
the latest version of the Mu editor for creating and editing your CircuitPython programs and for easy access to the CircuitPython serial connection (the REPL).
Most builds are available as both UF2 and bin files
here along with test builds. New Features
nrf: Adds nrf52840 USB support. Thanks
@hathach, @arturo182, @dhalbert and @jerryneedell. Adds translated messages for German (de_DE), French(fr), Spanish (es) and Tagalog (fil). English is available as en_US. Thanks to
@turbinenreiter, @arofarn, Pierrick C, @C47D, @eighthree, and @tannewt. atmel-samd: Adds support for Grand Central M4 Express,
Hallowing M0 Express and Trellis M4. Adds
to manage displays. Thanks to
@tannewt, @jedgarpark, @ladyada and @dhalbert. Adds dynamic VM memory management by changing stack size with
. Thanks to
@tannewt and @dhalbert. Breaking Changes!
None so far.
Thank you to all who used, tested,
contributed, helped out, and participated on GitHub and/or Discord:
@ladyada, @dhalbert, @tannewt, @kattni, @microbuilder, @arturo182, @tralamazza, @hathach, @glennrub, @siddacious, @deshipu, @sommersoft, @jerryneedell, @brentru, @caternuson, @dfarning, @jepler, @PaulKierstead, @notro, @Jahor, @Makdaam, @mrmcwethy and surely more we have missed. Join us on the Discord chat to collaborate. Documentation
Documentation is available
Here are all the
changes since 3.0.2.
This release is based on
MicroPython 1.9.4 @25ae98f. Support upstream MicroPython by purchasing a PyBoard (from Adafruit here). Troubleshooting
this guide for info on common problems with CircuitPython. If you are still having, then post to the Adafruit Support Forums and join Discord.
8-6-2021 (August 6, 2021) is the Snakiest day of the year and it’s also this year’s CircuitPython Day! The day highlights all things CircuitPython and Python on Hardware. See you there!
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the
drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.
Join 30,000+ makers on
Adafruit’s Discord channels and be part of the community! http://adafru.it/discord
Have an amazing project to share? The
Electronics Show and Tell is every Wednesday at 7pm ET! To join, head over to YouTube and check out the show’s live chat – we’ll post the link there.
Join us every Wednesday night at 8pm ET for
Ask an Engineer! Follow Adafruit on Instagram for top secret new products, behinds the scenes and more https://www.instagram.com/adafruit/ VIDEO CircuitPython – The easiest way to program microcontrollers – CircuitPython.org
Maker Business — Over 500,000 manufacturing jobs are going unfilled Wearables — Stop the sweat Electronics — Hummm… 60Hz noise in your amplifier driving you nuts? Python for Microcontrollers — Python on Microcontrollers Newsletter: EuroPython 2021, CircuitPython 7.0.0 alpha 5 and more! #Python #Adafruit #CircuitPython @micropython @ThePSF Adafruit IoT Monthly — Forest Fire Beacons, IoT for Beginners, and more! Microsoft MakeCode — MakeCode for the micro:bit - 2021 Release! EYE on NPI — Maxim’s Himalaya uSLIC Step-Down Power Module #EyeOnNPI @maximintegrated @digikey New Products – Adafruit Industries – Makers, hackers, artists, designers and engineers! — New Products 7/28/21 w/ Adafruit MCP9601 (MCP96L01) I2C Thermocouple Amplifier – STEMMA QT /Qwiic!
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