Add August 5th notes
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2019/2019-08-05.md
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# CircuitPython Weekly August 5th, 2019
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Video of the meeting is available [on YouTube](https://youtu.be/jWAWQpZQoHY) and [on diode.zone](https://diode.zone/videos/watch/f17e04ff-a7e9-4749-94e2-3dbe5dde8972)
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Join here for the chat all week: http://adafru.it/discord
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The weekly happens normally at 2pm ET/11am PT on Mondays. Check the #circuitpython channel for notices of change in time and links to past episodes.
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CircuitPython development is sponsored by Adafruit. Please support them by purchasing hardware from adafruit.com.
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Reminders: Podcast available on most services. Let us know if we’re missing some.
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## 4:50 Community News
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DRAFT newsletter!
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https://github.com/adafruit/circuitpython-weekly-newsletter/blob/gh-pages/_drafts/2019-08-06-draft.md
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8/8/2019 is CircuitPython day!
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We'll have a show on Weds, and Thurs, and more planned!
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Some photos!
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https://photos.app.goo.gl/xoAHetFnCj6RQpnz7
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Kattni PyOhio keynote video posted!
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https://youtu.be/-bBHXimlfPQ
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Accelerating Driver Development with CircuitPython
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https://pybay.com/speaker/bryan-siepert/
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CircuitPython 4.1.0 Released!
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https://github.com/adafruit/circuitpython/releases/tag/4.1.0
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NEW BOOK! CircuitPython for beginners with Adafruit Circuit Playground Express & Mu in Japanese
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https://twitter.com/AoyamaProd/status/1157775643750232064
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CircuitPython editing and saving on iOS is here!
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https://blog.adafruit.com/2019/07/30/its-now-possible-to-open-edit-and-save-python-code-on-ios-for-embedded-electronics-plugged-in-circuitpython-usb-devices-apple-ios-circuitpython/
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CircuitPython sneks its way to Snek!
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https://circuitpython.org/board/snekboard/
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“RISC architecture is gonna change everything”
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https://youtu.be/RL9yCWv7NS0
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We’re excited for open silicon! If someone is working on a RISC-V microcontroller with built-in USB and a good chunk of RAM please let us know! We're looking forward to writing "CircuitPython snakes its way to RISC-V!"
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https://blog.adafruit.com/2019/08/02/risc-architecture-is-gonna-change-everything-adafruit-joins-the-risc-v-foundation-risc_v-riscv-adafruit-adafruit/
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added #risc-v topic in Discord, er, RISCord…
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Best swag, yay!
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https://twitter.com/JackieKazil/status/1157502891822858243
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## 11:08 State of CircuitPython + Libraries
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Script is not happy. (@sommersoft: I restarted it yesterday. Failed both times due to requests/urllib3 timeouts)
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https://adafruit-circuit-python.s3.amazonaws.com/adabot/bin/adabot/circuitpython_library_report_20190805.txt
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CircuitPython 4.1.0 stable has been released!
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5.x alphas coming soon!
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## 13:08 Hug Reports
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17:10 @_cli_ninja - phillip for boards for circuitpython day and help organizing! They had cake!
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18:03 @brentr
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* @kantti for the keynote, watched it yesterday and it was wonderful. Circuit python = Code+Community!
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* Sybrenstuvel on GitHub for Python-RSA, a pure-python RSA implementation.
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* Another for @kattni for CPX docs/learnguides/resources, taught a class at NYCResistor on Circuitpython on the CPX and your resources helped me create curriculum for the class.
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* @danh BLE work
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@cater - lurking
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19:20 @CGrover - group hug!
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* Ladyada for useful decision in hardware design.
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* Kattni for inspiring keynote.
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20:02 @danh
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* @kattni for the keynote again, got to watch it
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* @tannewt for 4.1.0 release
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* @deshipu for _stage fixes and enhancements, pre-allocating buffers
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* @sethitow for BLE doc fix
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* @jepler for PWM and audio work
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21:06 @Dave Briccetti
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* General thanks for Circuit Python. It’s so nice to run Python on the Circuit Playground Express with my students.
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@DaveP - lurking
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21:32 @deshipu
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* @kattni for the keynote and a new font from it
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* @danh, @jepler and @tannewt for reviews and improvement suggestions
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* @jepler for discussion on audio buffers
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* @sommersoft, @jerryn and @ladyada for English lessons
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* @danh and @jerryn for continuing their fight with BLE
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22:30 @hukuzatanu - lurking - but hugs to _everyone_ who’s written Python intro guides. I’ve been able to point a number of people on Discord to them instead of saying “go buy this 1000-page Lutz book to learn Python.” :-)
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22:55 @jepler
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* Group hug
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23:22 @jerryn
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* @danh for continued BLE work and his patience with my questions.
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23:40 @kattni (missing meeting)
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* Thank you to everyone involved with PyOhio and my keynote. I will do my individual hugs next week when I’m around.
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23:55 @MakerMelissa
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* @Kattni for your excellent keynote. I enjoyed watching it...twice. :)
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@MikeBarela - lurking
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@ptorrone/adafruit - Thank you to all those folks who did CircuitPython Day events.
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@sommersoft (lurking)
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* Group Hug!
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13:55 @tannewt
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* Kattni for the wonderful keynote. Community is key for CircuitPython: https://www.youtube.com/watch?v=-bBHXimlfPQ
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* Jepler and sommersoft for the audio work.
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* Hexthat for fixing up audiocore imports
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* @matt-land for ImageLoad reviews
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* Matt Trentini for Extending MicroPython talk at PyCon.AU: https://www.youtube.com/watch?v=fUb3Urw4H-E
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* Nina for debugging talk at PyCon.AU: https://www.youtube.com/watch?v=HHrVBKZLolg
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* Elizabeth Dunham for community talk at PyCon.AU: https://www.youtube.com/watch?v=TW7PxyrCBR0
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* Thanks to PyOhio and PyCon.AU folks for including those of only online with the talk videos.
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## 24:27 Status Updates
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38:22 @_cli_ninja Gonna try the MQTT lib tomorrow and see how it goes with local and remote broker. Also did some light painting with circuitplayground last week, and looking for a BLE board to work on ble projects .
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28:36 @brentru
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* Last Week: IOT Monthly sent, Started work on CircuitPython RSA and Google IOT Core for Circuit python, misc. support/board bring up work. Spent my saturday PM teaching Circuit python at NYCResistor - oldest hackerspace in US. Lots of ideas on improving curriculum for the next time? Teaching absolute beginners to programming, nvm hardware.
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* CPY RSA is in a good spot, will likely see a release this week prior to an IOT Core release
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* Hitting a memory issue whilst porting Pyasn1 (https://github.com/etingof/pyasn1) over, if anyone has any “favorite asn.1” libraries, or would be interested in helping me see where/why it’s failing (tosses a generic MemoryError), let me know.
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* This work will let us load PEM files directly from the CIRCUITPY drive, opposed to decoding on your machine and loading into a secrets.py file.
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* Hashing, encryption/decryption all work
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* Tests written for high-level methods.
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* Google IOT Core for CircuitPy
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* Requires a JSON web token, hence all the RSA work (we may use this for IO in the future, it’s a better scheme than what we have now).
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* Hopefully will auth/talk with an application by EOD today, working on the library today.
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@cater - lurking
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31:14 @CGrover
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* adding musical envelope generator to custom featherwing. (ADSR) Probably use digital potentiometers. Can play Star Trek theme. Interesting volume trick by modifying aref.
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New string car m0 express will likely be new board def.
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Cheaper than gym membership and twice as sweaty landscaping project.
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35:33 @danh
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* Got pairing working and Current Time Service client working: can fetch time from an IOS device.
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* Working on BLE HID. Generalized current HID library so it can be used with BLE. Augmenting bleio as needed for BLE HID, and doing a little API restructuring
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* additional functionality for bleio.Descriptor
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* Can pass security permissions to Characteristic and Descriptor
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* Changed Characteristic.properties to a bitmask instead of a bunch of boolean args
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* Refactoring internals
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* To do: bonding
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38:40 @Dave Briccetti
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* With students, using CPE accelerometer with a p5.js program, to control the initial velocity of the boxes. Perhaps we’ll use this.
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@DaveP - lurking
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39:50 @deshipu
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* Stage updates (MicroPython, scaling, GIF)
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* Another PewPew-based badge for a conference
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* Second prototype for PewPew M4 — mostly working, only one bodge wire
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* PewPew Standalone now produced and sold by Makerfabs
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@hukuzatuna - lurking
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44:35 @jepler
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* Nrf pwm audio: feature complete, pull request waiting for review and merge. I don’t think anybody else has tried this code yet, though :(
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* Nrf “link time optimization”: pull request sent, is a trade off: increases build time but yields ~14% runtime performance improvement in “pystone” benchmark
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46:43 @jerryn
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* Mostly a Raspberry Pi week - Buster updates and some camera projects.
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* Blinka working very well!
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* Finally got to start poking at BLE -- with some help and pre-releases from Dan
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* Hope to have more time to explore this week. Sounds familiar….
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@jtrip - lurking
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48:14 @kattni (missing meeting)
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* PyOhio 2019 keynote - more next week.
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* Short vacation
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* PyRuler guide
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* Next up: display guides
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48:30 @MakerMelissa
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* Last Week:
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* Wrote a triangle Display Shape to get more familiar with displayio
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* Wrote Updated displayio Demo
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* Worked on updating lots of display guides with displayio specific setup steps
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* Updated Arduino ImageReader examples
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* This Week:
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* Continuing to update display guides
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@MikeBarela - lurking
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49:45 @sommersoft (lurking)
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* Last Week:
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* RosiePi:
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* Got Ubuntu Server 19.04 working. Its gcc-arm-none-eabi package is version 7-2018-q2, so firmware building will match current.
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* New Ansible headaches, with new OS/packages.
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* MixerVoice
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* Working on M4 again.
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* Discovered DeanM didn't get M0 functions finished. M0 doesn't have the Thumb/ASM instructions used on M4.
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* This Week:
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* MixerVoice: get M0 functions working
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* adabot: look into increasing occurrences of requests/urllib3 timeouts
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25:18 @tannewt
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* More EInk tricolor work. Next work is to redo refresh API. It’s the final displayio work todo too.
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* Released 4.1.0
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* Pushed driver repos if people want to test.
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* Leave for New York Tuesday afternoon and back Sunday evening.
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* Lots of videos, photos and streaming including CircuitPython Day!
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## 51:34 In the Weeds
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@danh
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* 51:57 Are non-Latin language translations (e.g. Korean) blocked due to missing Unicode functionality or fonts or both? Korean has a syllabic alphabet, about 90 characters. For ideograph languages, we could separate needing a font from being able to use Unicode chars over serial. We’ll need to test further.
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* 55:08 Increase circuitpython Travis builds to >5 jobs to speed up builds. We are paying for 10 concurrent jobs but share with other Adafruit builds. Maybe reorganize boards lists and collect third-party boards in separate lists. Could break build into one board+ all languages per job, and have shorter but more jobs. @sommersoft would like to clean up the build using travis matrix.
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@jepler
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* 1:02:02 I think that we can do better buffer allocation for audio I/O, but it requires more cooperation between audio sources (WaveFile, RawAudio, Mixer) and the audio device (AudioOut, PWMAudioOut). Just what this looks like is unclear, but it might save ~512 bytes of RAM when playing audio.
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@tannewt
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* 1:05:30 Remove displayio.Shape?
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## 1:10:25 Wrap-up
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