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Things are getting spooky in this end of October Python on Microcontrollers newsletter, brought you by the community! We’re on Discord, Twitter, and for past newsletters – view them all here. If you’re reading this on the web, subscribe here. Boo!!

Python Developer’s Survey 2021

Python Developer's Survey

Join the Python Developers Survey 2021 – this year the PSF conducting the fifth iteration of the official Python Developers Survey. The goal is to capture the current state of the language and the ecosystem around it. By comparing the results with last year’s, they can identify and share with everyone the hottest trends in the Python community and the key insights into them – Survey Link and information via the Python Software Foundation.

Also – do you know someone who should be a Python Software Foundation Fellow but isn’t yet? Nominate them before November 20, 2021, and PSF will add them to the list for considering Q4 2021 fellows – Nomination instructions.

vscode.dev Brings VS Code to the Browser


vscode.dev brings VS Code to the web with a lightweight version running fully in the browser. Open a folder on your local machine and start coding – Announcement Post and Adafruit Blog.

CircuitPython brought up to date with MicroPython 1.17

CircuitPython Update

Adafruit has brought the CircuitPython core up to date with MicroPython version 1.17. This brings some low level optimizations, but no major changes visible to users. A big thank you to the approximately 40 contributors to MicroPython’s 1.17 release. – CircuitPython.

MIT offers free online courses for Python programmers

Free online courses for Python programmers

The Massachusetts Institute of Technology (MIT) offers accessibility to its educational resources. You can take thousands of free MIT courses online.

Here are 4 courses that MIT offers for Python:

You can find other courses from MIT here.

Halloween Hackfest

Halloween Hackfest

HURRY! Ends October 28 at 11:59PM PDT! Join Hackaday, Digi-Key, and Adafruit for a Halloween-themed contest! They want to see your crazy, creepy, ghostly, spooky, and awesome projects.

If costumes are your favorite part of Halloween, then why not dress up your outfit with some hacked upgrades? You could even design a ghoulish prop to add to your home’s Halloween décor or light up a Jack-o-lantern with LEDs. Whether it’s technical, artistic, or just plain terrifying, Hackaday wants to see your projects!

Check out the Halloween Show & Tell with Hackaday, Friday, October 29th at 1pm PT, to show off your awesome projects entered in the contest. Don’t forget to also share your projects on social media and use the #HalloweenHackfest!

Hackaday and Digi-Key have partnered on this Halloween-themed contest to offer three winners an online shopping spree to the Digi-Key warehouse! – Hackaday and hackaday.io.

Hacktoberfest Begins October 1st

Hacktoberfest 2021

Hosted by DigitalOcean for the 8th year in a row, Hacktoberfest encourages participation in giving back to the open source community by completing pull requests, participating in events, and donating to open source projects.

Anyone around the globe who desires to help drive the growth of open source and make positive contributions to an ever-growing community. All backgrounds and skill levels are encouraged to participate. The first 55,000 participants can earn a T-shirt. Learn more – DigitalOcean.

For CircuitPython, edit Good First Issues and open issues. It is anticipated that the number of CircuitPython issues to work on will be higher this year.

October is also Open Hardware Month

Open Hardware Month

October is Open Hardware Month! The Open Source Hardware Association (OSHWA) is providing resources and asking the community to host small, local events in the name of open source hardware. See more – OSHWA.

Intel’s ControlFlag Automated Debugging Tool is Now Open Source

ControlFlag Now Open Source

Intel’s automated debugging tool ControlFlag is now open source. It can automatically detect anomalies in software code and it could spare developers hours of tedious work – ZDnet and source on GitHub.

CircuitPython Deep Dive Stream with Scott Shawcroft

Deep Dive with Scott

This week, Scott streams his work with CircuitPython on Raspberry Pi 4. He gets CircuitPython and the REPL to display on the Raspberry Pi HDMI port and working USB communications!

You can see the latest video and past videos on the Adafruit YouTube channel under the Deep Dive playlist – YouTube.

CircuitPython Parsec

CircuitPython Parsec

John Park’s CircuitPython Parsec:

Catch all the episodes in the YouTube playlist.

News from around the web!


CircuitPython I2S audio on an RP2040 enables this spooky doll to sing – Twitter.

Halloween Spooky Ghost With BBC Micro:bit on Cytron EDU:BIT

An animated scene made with the BBC micro:bit and Cytron EDU:BIT playing sound samples, moving a door with a micro servo and illuminating the scene with RGB pixels – Instructables.

Itsy Bitsy Kawaii Bat

Itsy Bitsy Kawaii Bat with an Adafruit Itsy Bitsy and CircuitPython – Twitter.

SparkFun Flame Necklace

SparkFun flame necklace, using an Adafruit QTPy RP2040 + CircuitPython, flame code by todbot – Adafruit Blog.

MagTag Stock Tracker / Ticker

MagTag Stock Tracker / Ticker – GitHub via Twitter.


How I won the CircuitPython Challenge with a Piano – Wokwi Blog via Twitter.


cPyBasic is a CircuitPython version of PyBasic for microcontrollers and has added a number of handy commands like NeoPixel use. It’s being developed on an Adafruit PyPortal Titano – GitHub.

PyCharm 2021.2.3 Is Out

PyCharm 2021.2.3 is out, the third minor release of PyCharm 2021.2, containing multiple bug fixes – PyCharm Blog and Adafruit Blog.

Maker HAT Base

Maker HAT Base, combine HAT and modules on Raspberry Pi 4 with CircuitPython Blinka – Cytron and YouTube.

Pimoroni PicoSystem Review

Pimoroni PicoSystem Review: Tiny Console for Big Ideas – Tom’s Hardware.


RetroVGA ia a new easy assembly platform which runs the PICOVGA library by Miroslav Nemecek and CircuitPython for some functions – Twitter.


CircuitPython School: How to add a STEMMA-QT/Qwiic connector to an Arduino Nano RP2040 Connect, or just about any other board without a built in connector. Also using CircuitPython with the MCP9808 temperature sensor and controlling decimals with print – YouTube via Twitter.

Modbus Master

Test of Modbus Master written in CircuitPython running on a Thingplus RP2040 – Twitter and hwhardsoft.de.

CircuitPython BLE keyboard

ISP1807 Micro board and CircuitPython BLE keyboard prototype. Powered by a single AAA battery (via a boost circuit) – Twitter (Japanese).

Pico and BME680

Connecting a BME680 gas sensor to a Raspberry Pi Pico running CircuitPython – RP2040.


Untextured raycaster running in MicroPython on the PicoSystem – Twitter and GitHub (preliminary).

Pico Clock

Computing History Pico Clock Workshop 28th Oct: Come and make your own contemporary clock using a Raspberry Pi Pico and a NeoPixel ring. We’ll learn to control it using MicroPython. The project will be mounted in a case ready to take home! Booking required – The UK Centre for Computing History.

REPL driven develpment

Attempting REPL-Driven Development in Python – Twitter.


pytube is a lightweight, dependency-free Python library (and command-line utility) for downloading YouTube Videos – GitHub.

compatlib – easily write backwards-and-forwards compatible libraries in CPython – GitHub.

PyDev of the Week: Yury Selivanov from Mouse vs Python

Adafruit CircuitPython Weekly Meeting for October 25th, 2021 on YouTube and the notes doc.

#ICYDNCI What was the most popular, most clicked link, in last week’s newsletter? CircuitPython 7 revised boot LED color chart.

Coming soon

Feather M4 Adalogger

Adafruit is doing a little revision of the favorite Feather M4 – with all the new things folks love from the last few years! From the RP2040 they’re borrowing the built-in STEMMA QT I2C port and 8MB QSPI flash. From the STM32 Feather, the bottom SD card slot. From the upcoming ESP32-S2 Feather, lower power usage by putting the I2C/SD/NeoPixel on disable-able power. Many still like the original Feather M4 but who doesn’t love a glow-up? Adafruit is gonna try this new PCB in pink. It also comes with USB-C.

We are thinking of doing a RP2040 Adalogger as well, with an SD card, but only if a bunch of you all want it, so make some noise if so – Adafruit Blog.

Educational Board

arturo182 on Twitter is running a survey on interest in an RP2040 educational board and what types of peripherals should be available if one were to be made – Twitter Thread and Survey.

LEGO Raspberry Pi Build HAT

Raspberry Pi has worked with LEGO to design the new Raspberry Pi Build HAT. Priced at $25, the Build HAT brings Raspberry Pi computing to LEGO elements: control LEGO Technic motors and sensors from a Raspberry Pi – Raspberry Pi.

ESP32-C3 Mini module Feather

Oak Dev Tech: it was a bit of a stretch to make it work but here it is! ESP32-C3 Mini module feather. Hopefully will have CircuitPython BLE support when that becomes stable for the C3 – Twitter.

New Boards Supported by CircuitPython

The number of supported microcontrollers and Single Board Computers (SBC) grows every week. This section outlines which boards have been included in CircuitPython or added to CircuitPython.org.

This week, there was one new board added:

Looking to add a new board to CircuitPython? It’s highly encouraged! Adafruit has four guides to help you do so:

New Learn Guides!

New Learn Guides

Adafruit ATtiny817 Breakout with seesaw from Kattni

Updated Guides

Adafruit Bluefruit LE Sniffer

The Introducing the Adafruit Bluefruit LE Sniffer guide was in much need of a refresh. The guide has been updated to show how to install and setup all the necessary software components. Luckily the Adafruit BLE Sniffer still works fine when using the latest versions of Wireshark, the Nordic plugin, and best of all – Python 3 – Adafruit Blog.

CircuitPython Project Bundle


When you get to the CircuitPython code section of an Adafruit Learn Guide, sometimes things can get a bit complicated. You not only have the code you need to upload to your device, but you likely also need to add some libraries that the code requires to run. This involved downloading all the libraries, digging through to find the ones you need, and copying them to your device. That was only the beginning on some projects, as those that include images and/or sound files required further downloading and copying of files. But, not anymore!

Now, with Project Bundles, you can download all the necessary code, libraries and, if needed, asset files with one click! We automatically check which libraries are required for the project and bundle them up for you. No more digging through a huge list of libraries to find the ones you need, or fiddling with looking for other files or dependencies. Download the Project Bundle, copy the contents to your device, and your code will simply work. We wanted to make this the easiest way to get a project working, regardless of whether you’re a beginner or an expert. We’ll also be adding this feature to popular IDEs as an add-on. Try it out with any Circuit Python guide on the Adafruit Learning System. Just look for the ‘Download Project Bundle’ button on the code page.

To download and use a Project Bundle:

In the Learning System – above any embedded code in a guide in the Adafruit Learn System, you’ll find a Download Project Bundle button.

Project Bundle download button

Click the button to download the Project Bundle zip.

Project Bundle zip downloaded

Open the Project Bundle zip to find the example code, all necessary libraries, and, if available, any images, sounds, etc.

Project Bundle unzipped

Simply copy all the files over to your CIRCUITPY drive, and you’re ready to go!

If you run into any problems or bugs, or would like to submit feedback, please file an issue on the Adafruit Learning System Guides GitHub repo.

CircuitPython Libraries!

CircuitPython Libraries

CircuitPython support for hardware continues to grow. We are adding support for new sensors and breakouts all the time, as well as improving on the drivers we already have. As we add more libraries and update current ones, you can keep up with all the changes right here!

For the latest libraries, download the Adafruit CircuitPython Library Bundle. For the latest community contributed libraries, download the CircuitPython Community Bundle.

If you’d like to contribute, CircuitPython libraries are a great place to start. Have an idea for a new driver? File an issue on CircuitPython! Have you written a library you’d like to make available? Submit it to the CircuitPython Community Bundle. Interested in helping with current libraries? Check out the CircuitPython.org Contributing page. We’ve included open pull requests and issues from the libraries, and details about repo-level issues that need to be addressed. We have a guide on contributing to CircuitPython with Git and Github if you need help getting started. You can also find us in the #circuitpython channel on the Adafruit Discord.

You can check out this list of all the Adafruit CircuitPython libraries and drivers available.

The current number of CircuitPython libraries is 337!

Updated Libraries!

Here’s this week’s updated CircuitPython libraries:

What’s the team up to this week?

What is the team up to this week? Let’s check in!


I fixed a PDMIn microphone bug on SAMD21, which was quite tricky to figure out. Thanks to Scott for talking through the possible causes.

A major focus of CircuitPython 8.0.0 will be support for cooperative multitasking, which is provided in regular Python by asyncio and similar packages. A subset of asyncio has already been implemented in MicroPython, and we might use that, or develop something similar. A simple example is to blink two LEDs at different rates as independent tasks. Another example would be to interrupt and change a running NeoPixel animation with a button push, without having to check explicitly inside the animation code for the interrupt. Or, you might want to do other work while waiting for, an I2C device to respond or a network request to finish. I’ll be spending time looking at this in more detail as we head toward 8.0.0.


Last week I implemented the watchdog module for SAM D5x/E5x microcontrollers (it was already available on most of the other families). This allows the microcontroller to reset itself if something goes wrong in a CircuitPython program that stops it from executing

I have a clock that this happens to, but more no more often than once a month, so it’s a tough problem to debug. If you have a project where “automatically resetting” is better than “getting lost and stuck”, consider enabling a watchdog to automatically reset it when things go wrong.


This week I published the ATtiny817 Breakout guide. This turned out to be a beefy one, with all the details about the ATtiny817 breakout with seesaw and STEMMA QT. It has everything you need to know about seesaw in general, and specific details and examples in both CircuitPython and Arduino for the ATtiny817 breakout with seesaw. If you picked up one of these versatile little boards, and need help getting started, check out this guide!

I’m now updating the Welcome to CircuitPython guide. This guide has been around for quite a while now, and has gone through many additions over that time. Which has been excellent, but has also caused it to grow and left it a bit meandering. To that end, I’m working on updating and restructuring the guide to provide the best possible experience to those getting started with CircuitPython.


This past week I finished up the file opening and saving dialogs and fixed any bugs that I came across. One particularly weird bug I came across was that it was writing random garbage to the files when saving them. I figured out it was only saving from a certain offset where the file was edited and anything before the offset was just whatever CircuitPython had in its memory. By changing it to write from the beginning of the file, it fixed the issue. The Code Editor is available at https://code.circuitpython.org/.


This week I hit a road block with TinyUSB on the Raspberry Pi so I switched to getting CircuitPython going over UART. I’ve made really good progress! I got the REPL working over UART and LEDs blinking. My next goal was to get displayio working over HDMI. That is the main reason I’m interested in getting CircuitPython going on the RPi. I spent all day yesterday poking at it only to realize I hadn’t fully seated my compute module on the IO board! Such a simple mistake. Once I did that, I was able to advance the code past where I was stuck. So I’m unblocked.

Furthermore, it turns out that the USB pins are also on the same connector! So, I need to circle back to that and see how much is working. It’d be great to get both HDMI and USB working soon.

Upcoming events!

PyCon Chile

PyCon Chile is coming November 5, 6 and 7th online – one day of workshops and Sprints, two days of talks! – more.

RISC-V Summit

RISC-V Summit brings the community together to show the power open collaboration can have on the processor industry. The audience spans across industries, organizations, workloads, and geographies to learn about the technology advancements in the RISC-V ecosystem and visibility of RISC-V successes. The event is December 6 – 8, in-person in San Francisco or virtually from anywhere in the world – Linux Foundation via Twitter.

PyCon US 2022

PyCon US 2022 planning is underway. The team is planning to host the event in person with an online component. April 27, 2022 – May 5, 2022. Head over to the PyCon US 2022 website for details about the conference and more information about the sponsorship program – PyCon Blog.

Send Your Events In

As for other events, with the COVID pandemic, most in-person events are postponed or cancelled. If you know of virtual events or events that may occur in the future, please let us know on Discord or on Twitter with hashtag #CircuitPython.

Latest releases

CircuitPython’s stable release is 7.0.0. New to CircuitPython? Start with our Welcome to CircuitPython Guide.

20211024 is the latest CircuitPython library bundle.

v1.17 is the latest MicroPython release. Documentation for it is here.

3.10.0 is the latest Python release. The latest pre-release version is 3.11.0a1.

2,630 Stars Like CircuitPython? Star it on GitHub!

Call for help – Translating CircuitPython is now easier than ever!

CircuitPython translation statistics on weblate

One important feature of CircuitPython is translated control and error messages.

With the help of fellow open source project Weblate, we’re making it even easier to add or improve translations.

Sign in with an existing account such as GitHub, Google or Facebook and start contributing through a simple web interface. No forks or pull requests needed!

As always, if you run into trouble join us on Discord, we’re here to help.

jobs.adafruit.com – Find a dream job, find great candidates!


jobs.adafruit.com has returned and folks are posting their skills (including CircuitPython) and companies are looking for talented makers to join their companies – from Digi-Key, to Hackaday, Micro Center, Raspberry Pi and more.

Jobs of the Week

Gameplay Programmer and other positions – Light Pong – Adafruit Jobs Board.

31,446 thanks!

31,446 THANKS

Adafruit Discord

The Adafruit Discord community, where we do all our CircuitPython development in the open, reached over 31,446 humans, thank you! Adafruit believes Discord offers a unique way for CircuitPython folks to connect. Join today at https://adafru.it/discord.

ICYMI – In case you missed it


The wonderful world of Python on hardware! This is our Python video-newsletter-podcast! The news comes from the Python community, Discord, Adafruit communities and more and is reviewed on ASK an ENGINEER Wednesdays. The complete Python on Hardware weekly videocast playlist is here.

This video podcast is on iTunes, YouTube, IGTV (Instagram TV), and XML.

Weekly community chat on Adafruit Discord server CircuitPython channel – Audio / Podcast edition – Audio from the Discord chat space for CircuitPython, meetings are usually Mondays at 2pm ET, this is the audio version on iTunes, Pocket Casts, Spotify, and XML feed.

And lastly, we are working up a one-spot destination for all things podcast-able here – podcasts.adafruit.com


The CircuitPython Weekly Newsletter is a CircuitPython community-run newsletter emailed every Tuesday. The complete archives are here. It highlights the latest CircuitPython related news from around the web including Python and MicroPython developments. To contribute, edit next week’s draft on GitHub and submit a pull request with the changes. You may also tag your information on Twitter with #CircuitPython.

Join our Discord or post to the forum for any further questions.