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If you missed Tuesday’s Python on Microcontrollers Newsletter, here is the ICYMI (In case you missed it) version.

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Happy Thanksgiving Week for those in the US! It’s the latest Python for 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. Here’s the latest:

Adafruit Industries, Unique & fun DIY electronics and kits Adafruit PiUART - USB Console and Power Add-on for Raspberry Pi ID: 3589 - Here's another super handy add-on for your Raspberry Pi computer, perfect for 'head-less' setups! Windows Driver Package - Adafruit Industries LLC (usbser) Ports ( is a Shareware software in the category Miscellaneous developed by Adafruit Industries LLC. It was checked for updates 157 times by the users of our client application UpdateStar during the last month.

CircuitPython 6.0.0 Stable and 6.1.0 beta 1

CircuitPython 6.0.0

CircuitPython 6.0.0, the latest major revision of CircuitPython, is now the new stable release.

Major new features and improvements since 5.x

• New port to ESP32-S2 chip.
• RGBMatrix display support.
• countio module to count pulses.
• watchdog controls hardware watchdog timer. Only on certain ports.
• vectorio provides native displayio shapes.
• canio provides support for CAN bus operations.
• _bleio adds support for HCI-based BLE co-processors, such as AirLift boards.
• aesio provides support for AES computations.
• async/await made available by default in many builds; support improved.
• Network modules are revamped, adding wifi, socketpool, ssl, and other modules. Disabled socket, wiznet5k and network modules. They will be removed in 7.x in favor of networking * libraries.
• Updated stage and pew libraries.
• _pixelbuf improvements.
• Improved USB serial detection.
• json can now read from stream objects.
• pulseio.PWMOut is split out into pwmio.PWMOut. It is still available in pulseio, but that is deprecated and will be removed in 7.x.
• Added memorymonitor for memory debugging. It is not enabled by default.
• Reduced power consumption (light sleep) during time.sleep() when possible.

CircuitPython 6.1.0 Beta 1

This is the second beta release of 6.1.0. (This first was broken.) It includes many changes that were done while 6.0.0 release candidates were in pre-release. Please use 6.0.x if you need a stable version of CircuitPython on all ports except ESP32-S2. Please use this release or newer for the ESP32-S2.

For more information: 6.0.0 Release and CircuitPython 6.1.0 Beta 1.

Core Development Milestone

Work on the CircuitPython core just crossed 2,000 closed pull requests! – GitHub.

Adafruit MagTag Projects

The Adafruit MagTag board with ESP32-S2 and a 2.9″ eInk display has seen a flurry of project development on social media. Here are just a few of the projects seen this week:

Making MagTag simple test projects, including a conference badge – GitHub.

A MagTag Day of Week display – todbot Blog.

Inspirational Quote eInk Display – Adafruit Blog and YouTube.

Updating a weather station monitor with an Adafruit MagTag – Twitter.

CircuitPyUI on the new Adafruit MagTag – Twitter and GitHub.

Quarantine Clock on a MagTag – Twitter and GitHub.

CircuitPython Deep Dive Stream with Scott Shawcroft

This week, Scott streams his work on ESP32-S2 debugging and JSON speedups.

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

Adafruit Update

Adafruit is shipping orders!

Adafruit is stocked and shipping orders! Now is the best time to get orders in for your favorite products, including holiday projects and gifts – Adafruit.

Adafruit is currently offering a one-time use discount code of 20% off after adding two factor authentication (2FA) to an Adafruit account. The code may be used until November 26, 2020. See this guide for details.

ESP32-C3 RISC-V microcontroller information leaked

It’s very cool to see a high power RISC-V core from espressif. CircuitPython won’t work on it, unfortunately, because the USB is a built-in usb to serial converter, so folks won’t be able to do mass storage with it. Longer term, it might be able to support CircuitPython with a BLE-only CircuitPython workflow. No word on a MicroPython port possibility. More info – Hackaday.

News from around the web!

A Zoom/Microsoft Teams mute button using CircuitPython and an Adafruit QT Py – furcean.com and Twitter.

Using CircuitPython, an Adafruit Feather nRF52840 Express board, and sensors in a model rocket (Ed: extra kudos for the vintage Radio Shack breadboard) – Twitter.

Here’s CircuitPython on FeatherS2 with simultaneous onboard WiFi and esp32spi WiFi and wired Ethernet – Twitter and GitHub.

A DIY Open Source High Fidelity Preamplifier running CircuitPython – Hackster.io and Open Electronics.

Install CircuitPython onto a nanoESP32S2 on Raspberry Pi – Twitter and YouTube.

Como iniciar en ESP32-S2 con Arduino y Circuitpython / How to boot into ESP32-S2 with Arduino and Circuitpython – YouTube (Spanish).

QuickPYTHON, a retro-futuristic educational interactive coding environment. Powered by Python and nostalgia – GitHub.

“Our daughter, like many kids, enjoys pressing buttons and flipping switches. I attempted to build her a ‘busy box’ to satisfy her button-pushing tendencies. I started simple: a couple of light-up buttons and some LEDs. The Trinket M0 from Adafruit, was my starting point. I chose it because it was small and could run CircuitPython.” – curtmerrill.com.

snakeware is a free Linux distro with a Python userspace inspired by the Commodore 64. It boots directly into a Python interpreter, which you can use to do with whatever you want – GitHub.

Nina’s lightning guide to staying connected with the Python Community – dev.to and Twitter.

The BBC Doctor Who “HiFive Inventor” Coding Kit – cnx-software.

The Origin of the “MIT License” – IEEE Xplore.

MicroDev’s microS2 Packs an ESP32-S2 Microcontroller Into a Tiny Module-Size Form Factor – hackster.io and GitHub.

EMonitor — ESP32 based Environment Monitoring Device with Flask Server – Twitter and Medium.

rpy2 is an interface to R running embedded in a Python process – Twitter and Sourceforge.

Bitmap font editor tool – NathanDumont and GitHub.

Make a simple calculator with guizero and Python – blogmywiki.

Beginner Python Tutorial: Analyze Your Personal Netflix Data – Twitter and Dataquest.

Regular Expressions and Building Regexes in Python – Twitter and RealPython.

#ICYDNCI What was the most popular, most clicked link, in last week’s newsletter? Hackster.io article on the Adafruit MagTag.

PyDev of the week: Reuven Lerner on Mouse vs Python

CircuitPython Weekly Meeting for November 23, 2020 (notes) on YouTube.

Coming soon

Developing a CircuitPython driver for the SparkFun Qwiic Twist – Twitter.

MorphESP 240 by Morpheans – an ESP32-S2 dev board with integrated display at CrowdSupply – CrowdSupply.

CodeBug Connect: cute, colourful & programmable IoT wearable, using MicroPython, on Kickstarter – Kickstarter.

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 we had one new board added!

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

New Learn Guides!

Which CircuitPython Board is Right for You? from Kattni

Matrix Portal Flow Visualizer from Carter Nelson

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 281!

New Libraries!

Here’s this week’s new CircuitPython libraries:

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!

Bryan

This week saw me doing guide work for some upcoming sensors, as well as new driver work for the MLX90395 3-axis magnetometer from Melexis. This is a neat sensor, similar in use to the TLV493D as it is designed for measuring the orientation and position of magnetic fields from magnets. It will be fun to see how this can be used for new and interesting motion detection or sensing projects!

Dan

I did the final steps for the CircuitPython 6.0.0 stable release on Monday evening last week. Thanks to all who worked on and tested this really significant release!

I am continuing to work on light sleep and deep sleep in CircuitPython, after significant work by Scott and @microDev. We iterated on the API, and I’m now doing the boilerplate for that API. As soon as that compiles, I will then implement deep sleep for a time duration on the ESP32-S2 as the first case. Scott and microDev1 have done a lot of the internal work already, so I hope that part will not take long. Then I’ll work on deep sleep for pin transitions, and then light sleep for both durations and pins.

Jeff

I did some bug fixing on ESP32-S2 during the past week. First, I fixed a problem which prevented CircuitPython on the ESP32-S2 from connecting to certain secure websites, including thingspeak and Adafruit IO. Second, I fixed a problem where the board would become unstable after using an I2C device. Both are working much more stably now!

Kattni

This week I published the Which CircuitPython Board is Right for You? guide. This guide is designed to help you choose between CircuitPython boards based on different features such as WiFi enabled, Bluetooth enabled, built in display or tiny boards. It also has a page explaining the differences between the different chipsets available on CircuitPython compatible boards, and the pros and cons of each. If you’ve held off getting started with CircuitPython because you were overwhelmed by the choice of boards, or you’re a seasoned pro trying to decide which board to get, this guide is for you!

I also tested an update to the PyBadger library. Thanks to @foamyguy, it now supports the new MagTag board. If you’re looking to use your MagTag as a badge, check out the example included with this update.

Melissa

This past week I fixed the Raspberry Pi 1.3” display driver. When it was in orientations other than zero degrees, the display was offset by 80 pixels. I rewrote the Device Tree Overlay based on a similar one we had for the 1.14” display, which was my first experience working on a Device Tree Overlay.

I added a few improvements to the MagTag library based on feedback from a few projects that were converted to work on it. My goal with this library was to make it extensible, but easy to develop on. One of the projects I made while developing this was a bitcoin display.

I’ve also been getting back into working on some of the web-based tools such as making a few fixes to my existing code and I started working on an online ESP Tool. The ESP tool would allow you to upload a bootloader and have it program your ESP board. It’s not currently working, but I am debugging it at the moment.

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Scott

This past week I’ve been doing my best to run down bugs CircuitPython. At the end of last week I was looking into adding grayscale eInk support and also found and fixed a couple bugs in our grayscale conversion. As of this morning, they are all merged into the main branch of CircuitPython.

We just released 6.0.0 stable, which is stable for our core platforms, SAMD21, SAMD51 and nRF52840. However, it isn’t stable on the ESP32-S2 yet. So, I’ve been doing my best to find and fix issues. I attempted to release our first 6.1.0-beta.0 but it turned out to include a pretty nasty bug. So, I’m hoping to do a beta.1 today. Folks, with ESP32-S2 boards like the MagTag should continue to use the latest pre-release. It’ll be better than 6.0.0 for the -S2.

This period of bug squishing happens for every new port we do for CircuitPython. Once we’re through it, things should be very exciting. The -S2’s native USB combined with WiFi and new low power API promises to bring CircuitPython’s ease of use to a whole new class of long-running, connected applications.

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Upcoming events!

Women Who Code CONNECT Forward, December 2-4, 2020 online – Women Who Code.

Join educators, researchers, and the developer community for micro:bit LIVE 2020 virtual, an online event December 4-5, 2020. There is no cost to register and attend – Microbit.Org.

PyDay Chile 2020 Conference: December 5, Online. The deadline for applying for talks is November 18 – pyday.cl.

Virtual Girls Into Coding #6, December 13th: a free event for girls ages 10-14 to explore online coding activities, online robotics, 3D Design, electronics, and physical computing using the BBC micro:bit. This is a fantastic opportunity to use Python (text-based language) and to get some hands-on making time from the comfort of your home – Eventbright.

The 2021 Open Hardware summit will be held online, Friday April 9, 2021. The summit will be livestreamed, but ticket holders will have access to additional interactive portions of the summit like meet-and-greets, workshops, and sponsor booths. Find details, including ticket and sponsorship information at 2021.oshwa.org – OSHWA.

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 6.0.0 and its unstable release is 6.1.0-beta.1. New to CircuitPython? Start with our Welcome to CircuitPython Guide.

20201123 is the latest CircuitPython library bundle.

v1.13 is the latest MicroPython release. Documentation for it is here.

3.9.0 is the latest Python release. The latest pre-release version is 3.10.0a2.

1,900 Stars Like CircuitPython? Star it on GitHub!

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

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, Microcenter, Raspberry Pi and more.

Job of the Week

Learning Coach – Science & Engineering – Adafruit Jobs Board.

A Learning Coach is any educator hired by Dexter to be a regular faculty member. Our Learning Coaches are experienced, collaborative, committed to effective teaching and professional growth, love working with students inside and outside of the classroom, and engage in their work with dedication and humor.

25,894 thanks!

The Adafruit Discord community, where we do all our CircuitPython development in the open, reached over 25,894 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

Codecademy “Learn Hardware Programming with CircuitPython”

Codecademy, an online interactive learning platform used by more than 45 million people, has teamed up with the leading manufacturer in STEAM electronics, Adafruit Industries, to create a coding course, “Learn Hardware Programming with CircuitPython”. The course is now available in the Codecademy catalog.

Python is a highly versatile, easy to learn programming language that a wide range of people, from visual effects artists in Hollywood to mission control at NASA, use to quickly solve problems. But you don’t need to be a rocket scientist to accomplish amazing things with it. This new course introduces programmers to Python by way of a microcontroller — CircuitPython — which is a Python-based programming language optimized for use on hardware.

CircuitPython’s hardware-ready design makes it easier than ever to program a variety of single-board computers, and this course gets you from no experience to working prototype faster than ever before. Codecademy’s interactive learning environment, combined with Adafruit’s highly rated Circuit Playground Express, present aspiring hardware hackers with a never-before-seen opportunity to learn hardware programming seamlessly online.

Whether for those who are new to programming, or for those who want to expand their skill set to include physical computing, this course will have students getting familiar with Python and creating incredible projects along the way. By the end, students will have built their own bike lights, drum machine, and even a moisture detector that can tell when it’s time to water a plant.

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Visit Codecademy to access the Learn Hardware Programming with CircuitPython course and Adafruit to purchase a Circuit Playground Express.

Codecademy has helped more than 45 million people around the world upgrade their careers with technology skills. The company’s online interactive learning platform is widely recognized for providing an accessible, flexible, and engaging experience for beginners and experienced programmers alike. Codecademy has raised a total of $43 million from investors including Union Square Ventures, Kleiner Perkins, Index Ventures, Thrive Capital, Naspers, Yuri Milner and Richard Branson, most recently raising its $30 million Series C in July 2016.

Contribute!

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.

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

Micropython 1.10 Release – Vast improvements to native emitter, new nrf port, unified documentation.

In this release there are a wide range of improvements and additions to both the core and the ports. In the core the main improvement was to the native emitter to have much more comprehensive support for general Python features, such as generators and complex exception handling, and the generated machine code is smaller and retains its efficiency. Elsewhere, fuzzy testing was used to find and eliminate some corner-case bugs, user classes were optimised when they don’t use special accessors, underscores in numeric literals are now supported (PEP515), and the uio.IOBase class was added to allow user defined streams.

For the extended modules there is now a VfsPosix filesystem component, a new ucryptolib module with AES support, addition of ure.sub() and of uhashlib.md5, and the lwIP socket implementation now has working TCP listen/accept backlog.

Compared to the last release the minimal baseline core code size is reduced by about 2.2%, down by roughly 1500 bytes for bare-arm port and 3500 bytes for minimal x86 port. Most other ports have increased in size due to the addition of new features (eg ucryptolib, ure.sub).

The stm32 port sees the introduction of a new bootloader — mboot — which supports DFU upload via USB FS, USB HS, as well as a custom I2C protocol, and also support to program external SPI flash. There is significant refactoring of the USB device driver, improved VCP throughput, and support for 2x VCP interfaces on the one USB device. lwIP has been integrated, and support added for SDRAM. Cortex-M0 CPUs are now supported along with STM32F0 MCUs.

For the esp8266 port the heap is increased by 2kbytes, the radio is automatically put to sleep if no WLAN interfaces are active, and the UART can now be disconnected from the REPL and its RX buffer length configured. Upon soft-reset sockets are now cleaned up.

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The esp32 port has added support for external SPI RAM, PPPoS functionality, improved performance and stability when using threads, and other general bug fixes.
There is a new nrf port for Nordic MCUs, currently supporting nRF51x and nRF52x chips.

The docs have now been unified so there is just one set of documentation covering all ports. And initial documentation for the esp32 port is added.

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There are two changes at the Python API level that are not backwards with previous versions:

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• uos.dupterm now requires that a stream passed to it is derived from uio.IOBase (or is a native stream object).
• The esp32 neopixel driver has had its default timing changed from 400kHz to 800kHz; existing code that didn’t explicitly specify the “timing” parameter in the NeoPixel constructor may need to be updated to specify this as “timing=0” to get 400kHz timing.

More details at GitHub, forum post, changelog, and download.