491: Oscillators Oscillating Other Oscillators

Chris and Elecia spoke with Kirk Pearson about running audio-electronic-art workshops, interesting sounds, and their book Make: Electronic Music from Scratch: A Beginner's Guide to Homegrown Audio Gizmos. 

Find the book and a whole kit of parts on the Dogbotic Merch page. A few clicks from there you can find the Workshop List (don’t forget the coupon in the show audio). 

We also mentioned The Thing (a sneaky listening device), Elliot Williams’ writing on CMOS synthesizers (a series called Logic-Noise) and the videos of Sebastian Tomczak (YouTube: littlescalemusic).

Transcript

Memfault is a leading embedded device observability platform that empowers teams to build better IoT products, faster. Its off-the-shelf solution is specifically designed for bandwidth-constrained devices, offering device performance and product analytics, debugging, and over-the-air capabilities. Trusted by leading brands such as Bose, Lyft, Logitech, Panasonic, and Augury, Memfault improves the reliability of devices across consumer electronics and mission-critical industries such as access control, point of sale, energy, and healthcare. To learn more, visit memfault.com.

490: Wait Until Physics Has Happened

Nikolaus Correll spoke with us about robots, teaching robotics, and writing books about robots. 

Nikolaus is a Professor of Computer Science at the University of Colorado, see his lab website (or his Wikipedia page).

We discussed Nikolaus’ Introduction to Robotics with Webots Specialization Coursera course (or YouTube Playlist). These go along with his Introduction to Autonomous Robots (which can be compiled from source from github).

Masters of Computer Science online via University of Colorado and Georgia Tech.

While the Arcbotics’ Sparki is no longer in production, Nikolaus also mentioned the Amazon Racer.

Transcript

Nordic Semiconductor has been the driving force for Bluetooth Low Energy MCUs and wireless SoCs since the early 2010s, and they offer solutions for low-power Wi-Fi and global Cellular IoT as well. If you plan on developing robust and battery-operated applications, check out their hardware, software, tools, and services.
 
On academy.nordicsemi.com, you’ll find Bluetooth, Wi-Fi, and cellular IoT courses, and the Nordic DevZone community covers technical questions:  devzone.nordicsemi.com.
 
Oh, and don’t forget to enter Nordic Semiconductor’s giveaway contest! Just fill out the entrance form, and you're in the running. Good luck!

489: Constructive Cat

Chris and Elecia discuss her origami art show, ponder PRs for solo developers, attempt to explain GDB debugging, and make a to-do list for getting rid of Kanga.

Elecia is having an Origami Octopus Garden art show at the Aptos Public Library for the month of November, 2024. The postcard advertisement is below. There are more pictures on her Instagram (@elecia_white). The python tessellation generator is here.

Memfault’s Interrupt Debugging Firmware with GDB post is a much more considered explanation of GDB and includes pointers to other resources (including using Python with GDB).

Transcript

Memfault is a leading embedded device observability platform that empowers teams to build better IoT products, faster. Its off-the-shelf solution is specifically designed for bandwidth-constrained devices, offering device performance and product analytics, debugging, and over-the-air capabilities. Trusted by leading brands such as Bose, Lyft, Logitech, Panasonic, and Augury, Memfault improves the reliability of devices across consumer electronics and mission-critical industries such as access control, point of sale, energy, and healthcare. To learn more, visit memfault.com.

488: Two Slices of Complimentary Bread

Adrienne Braganza Tacke spoke with us about her book Looks Good To Me: Constructive Code Reviews. It is about how to make code reviews more useful, effective, and congenial. 

Adrienne’s book is available now as an ebook at manning.com or a paper copy later in the year (Amazon link). Check out the example Team Working Agreement from Appendix A.

Adrienne’s personal website is adrienne.io.

Transcript

487: Focus on Fizzing

Chris and Elecia chat about simulated robots, portents in the sky, the futility of making plans, and grad school. 

A problem with mics led us to delay the show with Shimon Schoken from Nand2Tetris (co-author of Elements of The Elements of Computing Systems: Building a Modern Computer from First Principles). Look for that later in the year.

Elecia is playing with Webots, a robotics physics simulator. Simpler than ROS’s Gazebo, it also can run in an online mode where you can run it on a browser, selecting between many different robots. 

Chris talked about processing his photos of Comet C/2023 A3 (Tsuchinshan–ATLAS) using PixInsight and Siril.

Then we talked about grad school (including Georgia Tech’s reasonably affordable CS Master’s Degree).

Tony sent in this insect detector: Mothbox. If you want links like this or de facto letters to the editor, please sign up for the Embedded.fm newsletter.

Transcript

Photo of Comet C/2023 A3 (Tsuchinshan–ATLAS), taken from Seacliff Beach in Aptos, CA by Chris White

486: A Nice Rainbow Dream

Antoine van Gelder spoke to us about making digital musical instruments, USB, and FPGAs. 

Antoine works for Great Scott Gadgets, specifically on the Cynthion USB protocol analysis tool that can be used in conjunction with Python and GSG’s FaceDancer to act as a new USB device. 

While bonding over MurderBot Diaries was a given, Antoine also mentioned NAND2Tetris which Elecia countered with The Elements of Computing Systems: Building a Modern Computer from First Principles, the book that covers the NAND2Tetris material.

Transcript

 Memfault is a leading embedded device observability platform that empowers teams to build better IoT products, faster. Its off-the-shelf solution is specifically designed for bandwidth-constrained devices, offering device performance and product analytics, debugging, and over-the-air capabilities. Trusted by leading brands such as Bose, Lyft, Logitech, Panasonic, and Augury, Memfault improves the reliability of devices across consumer electronics and mission-critical industries such as access control, point of sale, energy, and healthcare. To learn more, visit memfault.com.

485: Conversation Is a Kind of Music

Alan Blackwell spoke with us about the lurking dangers of large language models, the magical nature of artificial intelligence, and the future of interacting with computers. 

Alan is the author of Moral Codes: Designing Alternatives to AI  which you can read in its pre-book form here: https://moralcodes.pubpub.org/

Alan’s day job is as a Professor of Interdisciplinary Design in the Cambridge University department of Computer Science and Technology. See his research interests on his Cambridge University page.

(Also, given as homework in the newsletter, we didn’t directly discuss Jo Walton’s 'A Brief Backward History of Automated Eloquence', a playful history of automated text generation, written from a perspective in the year 2070.)

Transcript

484: Collecting My Unhelpful Badge

Chris and Elecia talk to each other about setting aside memory in a linker file, printing using your debugger, looking around a new code base, pointers as optimization, choosing processors, skill trees and merit badges.

Elecia’s Creating Chaos and Hard Faults talk and slides.

STM32 Application Note AN4989 microcontroller debug toolbox includes semihosting. Memfault’s Interrupt blog has a good Semihosting post.

Elecia and Steph’s Embedded Skills Tree. A far more detailed one pointed out by a listener: A comprehensive roadmap for aspiring Embedded Systems Engineers, featuring a curated list of learning resources. 

The most influential book Elecia has never read is You Can Do It!: The Merit Badge Handbook for Grown-Up Girls. 

Transcript

 Memfault is a leading embedded device observability platform that empowers teams to build better IoT products, faster. Its off-the-shelf solution is specifically designed for bandwidth-constrained devices, offering device performance and product analytics, debugging, and over-the-air capabilities. Trusted by leading brands such as Bose, Lyft, Logitech, Panasonic, and Augury, Memfault improves the reliability of devices across consumer electronics and mission-critical industries such as access control, point of sale, energy, and healthcare. To learn more, visit memfault.com.

483: An Ion of the Highest Fidelity

Rick Altherr spoke with us about high-speed control, complicated systems, and making quantum computers.

If you want to know more about building quantum computers, take a listen to Rick’s MacroFab episode: The Nuts and Bolts of Quantum Computing.

If you want to make your own quantum circuit simulator, it only takes 27 lines of Python: A Quantum Circuit Simulator in 27 Lines of Python.

What about if you actually want to know about quantum computing? Rick suggests Quantum computing for the very curious while we look back at Embedded.fm 344: Superposition, Entanglement, and Interference with Kitty Yeung, talking about her Quantum Computing Comic book and Hackaday lecture series. 

Rick works for IonQ where they do trapped-ion quantum computing (there are different physics methods for making ions dance to the tune of quantum computing).

If you want to talk to Rick, maybe to get his advice about your resume or career prospects, he sets aside a few hours each week to share his wisdom: https://calendly.com/mxshift

You can also find Rick on Mastodon and LinkedIn. He was also the guest on 311: Attack Other People's Refrigerators about security hacking and mentoring.

Transcript

482: Reference the Same Dog Object

Dr. Colleen Lewis joined us to talk teaching pointers with stuffies, explaining inheritance through tigers, and computer science pedagogy.

Check out her YouTube channel to view her videos explaining CS concepts with physical models. These are also collected on her website: Physical Models of Java.

If you are an instructor (or thinking about teaching CS), check out Colleen’s CS Teaching Tips. You may also be interested in some other research:

• John Edwards Study on Syntax exercises in CS1

• Daniel Willingham on why learning styles aren’t a real thing

• A Beginner's Guide to Teaching with Algebra Tiles

Colleen is an Assistant Professor at University Illinois, Urbana-Champaign’s Siebel School of Computing and Data Science. You can find her papers on Google Scholar (including studies on teaching and learning). 

Transcript

Memfault is a leading embedded device observability platform that empowers teams to build better IoT products, faster. Its off-the-shelf solution is specifically designed for bandwidth-constrained devices, offering device performance and product analytics, debugging, and over-the-air capabilities. Trusted by leading brands such as Bose, Lyft, Logitech, Panasonic, and Augury, Memfault improves the reliability of devices across consumer electronics and mission-critical industries such as access control, point of sale, energy, and healthcare. To learn more, visit memfault.com.

481: The Girl from Evel Knievel

Chris and Elecia talk about their current adventures in conference talks, play dates, and skunks. 

Elecia’s talks are available on YouTube:

• Creating Chaos and Hard Faults: An introduction to hard fault handlings, stack overflows, and debugging hard bugs

• Introduction to Embedded Systems (O'Reilly Expert Webinar): An introductions to… well, embedded systems

• These are both advertising for the 2nd edition of Elecia’s book, Making Embedded Systems: Design Patterns for Great Software. You can also find it on O’Reilly’s Learning System and probably read it with your 30 Day Trial (here). 

Chris got a handheld game console, the Playdate (play.date), and has been writing a game for it. There is an interesting looking MicroPython port for it.

We also mentioned Tiny Tapeout Demoscene which sounds pretty neat. And KiCanvas where you can see KiCAD schematics without loading KiCAD.

Our newsletter has been off but will be back to normal next week. The RSS feed is probably not fun to look at but Elecia’s Rebloginator shows some Python tools for parsing feeds. 

Neither the dog nor the skunk seem contrite.

Transcript

480: Surprises Early In The Game

Jerry Twomey spoke with us about his new O’Reilly book Applied Embedded Electronics which covers embedded topics such as EMI, signal processing, control systems and non-ideal components.

Jerry is also the principal engineer at Effective Electrons. His articles are linked from there and you can contact him via the site.

Here is a 30-day trial for the O’Reilly Learning System. You can take a look at Jerry’s Applied Embedded Electronics and Elecia’s Making Embedded Systems as well as hundreds of other books about software, hardware, engineering, and origami. 

Transcript

479: Make Your Voice Heard

Carles Cufí spoke with us about Zephyr, Nordic, learning, open source development, and corporate goals. 

Carles had some great suggestions for learning Zephyr:

• Memfault Interrupt Practical Zephyr blog series

• Nordic’s Developer Academy 

• Zephyr’s Discord server

• Zephyr’s YouTube channel (@ZephyrProject), sorted by views 

• Macrobatics term is from Zephyr Devicetree Mysteries, Solved - Marti Bolivar, Nordic Semiconductor 

There is also the Zephyr website for a full picture. And various Nordic tutorials (see nRF5340 Audio applications). 

Carles was an author on Getting Started with Bluetooth Low Energy: Tools and Techniques for Low-Power Networking. The cover animal is a mousebird. 

Transcript

478: The Map Is Not the Territory

Jan Rychter joined us to talk about building a company, electronic components, and software design.

Jan is the founder and engineer at PartsBox.com. If you are interested in the meta-analysis of the data, check out his article on the Top Ten Hobby Parts and the Electronic Component Database, 

You can find out more about Jan through his website (jan.rychter.com), LinkedIn, or Mastodon.

Transcript

477: One Thousand New Instructions

Kwabena Agyeman joined Chris and Elecia to talk about optimization, cameras, machine learning, and vision systems. 

Kwabena is the head of OpenMV (openmv.io), an open source and open hardware system that runs machine learning algorithms on vision data. It uses MicroPython as a development environment so getting started is easy. 

Their github repositories are under github.com/openmv. You can find some of the SIMD details we talked about on the show:

• 150% faster: openmv/src/omv/imlib/binary.c

• 1000% faster: openmv/src/omv/imlib/filter.c

• Double Pumping: openmv/src/omv/modules/py_tv.c

Kwabena has been creating a spreadsheet of different algorithms in camera frames per second (FPS) for Arm processors: Performance Benchmarks - Google Sheets. As time moves on, it will grow. Note: this is a link on the OpenMV website under About. When M55 stuff hits the market expect 4-8x speed gains.

The OpenMV YouTube channel is also a good place to get more information about the system (and vision algorithms).

Kwabena spoke with us about (the beginnings of) OpenMV on Embedded 212: You Are in Seaworld.

Transcript

Elecia is giving a free talk for O'Reilly to advertise her Making Embedded Systems, 2nd Edition book. The talk will be an introduction to embedded systems, geared towards software engineers who are suddenly holding a device and want to program it. The talk is May 23, 2024 at 9:00 AM PDT. Sign up here. A video will be available afterward for folks who sign up. 

476: Sidetracked by Mining the Moon

Lee Wilkins joined Chris and Elecia to talk about The Open Source Hardware Association, the Open Hardware Summit, and zine culture.

The Open Source Hardware Association (OSHWA) provides certification and support for creating open source hardware. The Open Hardware Summit is happening May 3-4, 2024. It is in Montreal, Canada. It also has many online components including a Discord and online Unconferece. All videos are available for later watching on YouTube. 

Lee’s personal page is leecyb.org. Their zines are available in their shop. 

Elecia mentioned enjoying There Are No Electrons: Electronics for Earthlings by Kenn Amdahl.

Transcript

475: Stuffed Animal or Colleague

Chris and Elecia talk about the Embedded Online Conference, their experience learning Zephyr, and some listener questions.

Elecia will be presenting on Creating Chaos and Hard Faults at the Embedded Online Conference, Apr 29 - May 3, 2024. Some other talks that look interesting:

• The Power of a Look-up Table by Nathan Jones

• Zephyr Tools To Debug Hardware by Chris Gammell

• Breaking Good: Why Virtual Hardware Prefers Rough Handling by Uri Shaked

• Beyond Coding: Toward Software Development Expertise by Marian Petre

Use the EMBEDDEDFM coupon for a discount (or if your whole team is going, check out the group discounts).

Elecia’s book (Making Embedded Systems, 2nd Edition) is shipping (Amazon or Bookshop.org).

Zephyr is pretty amazing. 

Transcript

474: It's All Chaos and Horror

Logic gates and origami? Professor Inna Zakharevich joined us to talk about Turing complete origami crease patterns. 

We started talking about Turing completeness which led to a Conway’s Game of Life-like 2D cellular automaton called Rule 110 (Wikipedia) which can be implemented with logic gates (AND, OR, NOT). These logic gates can be implemented as creases in paper (with the direction of the crease indicating 0 or 1). 

The paper describing the proof is called Flat Origami is Turing Complete (arxiv and PDF). Quanta Magazine has a summary article: How to Build an Origami Computer.

Inna’s page at Cornell University also has the crease patterns for the logic gates (pdf).

Inna is an aficionado of the origami work by Satoshi Kamiya who creates complex and lifelike patterns. 

Some other origami mentioned:

• Origami Stegosaurus by John Montroll YouTube Folding video (Part 1 of 3)

• Ilan Garibi’s Pineapple Tessellation (PDF instructions)

• Eric Gjerde Spread Hex Origami Tessellation (This also has the equilateral triangle grid needed to fold Inna’s gate logic)

• Peter Engel

• Amanda Ghassaei’s Origami Simulator (Mooser’s is under Examples->Origami)

Some other math mentioned:

• Veritasium’s Math's Fundamental Flaw talks about Gödel's Incompleteness Theorem

• Physical Logic Game: Turing Tumble - Build Marble-Powered Computers

• Mathematics of Paper Folding (Wikipedia)

Transcript

Memfault is making software the most reliable part of the IoT with its device reliability platform that enables teams to be more proactive with remote debugging, monitoring and OTA update capabilities. Try Memfault's new sandbox demo at demo.memfault.com. Embedded.fm listeners receive 25% off their first-year contract with Memfault by booking a demo here: https://go.memfault.com/demo-request-embedded

473: Math Is Not the Answer

Philip Koopman joined us to talk about how modulo 255 vs 256 makes a huge difference in checksum error detection, how to get the most out of your checksum or CRC, and why understanding how they work is worth the effort.

Philip has recently published Understanding Checksums and Cyclic Redundancy Checks. He’s better known for Better Embedded System Software as well as his two books about safety and autonomous vehicles:

• The UL 4600 Guidebook: What to Include in an Autonomous Vehicle Safety Case

• How Safe Is Safe Enough?: Measuring and Predicting Autonomous Vehicle Safety

Phil has many free video lectures with great visuals to go along with his books. He also has three(!) blogs:

• Safe Autonomy 

• Better Embedded System SW

• Checksum and CRC Central (including a post on checksum speed comparison)

Currently, Phil is a professor at Carnegie Mellon University (his page there). You can follow him on LinkedIn. 

Elecia read (and give 2.5 stars to) Symmetry: A Journey into the Patterns of Nature by Marcus du Sautoy: “Interesting but uneven, I kept reading to find out what horrible things math profs do to their children in the name of fun. Worth it when I finally got to a small section with Claude Shannon (and Richard Hamming). It didn’t help with this podcast but it was neat.”

Transcript

Nordic Semiconductor empowers wireless innovation, by providing hardware, software, tools and services that allow developers to create the IoT products of tomorrow. Learn more about Nordic Semiconductor at nordicsemi.com, check out the DevAcademy at academy.nordicsemi.com and interact with the Nordic Devzone community at devzone.nordicsemi.com.

472: Field of Boxes

Making Embedded Systems, 2nd Edition came out today! Chris and Elecia talk about the changes, the writing, but not the eldritch horror. Then we talk about pianos and origami. 

The electronic version is available now on Amazon, ebooks.com, Google Play and where you get your ebooks. The paper copy will be out in about two weeks, you can preorder now. It is also available on the O’Reilly Learning System, here is a  30-day Trial.

See the Embedded.fm Origami and Flex PCBs newsletter, sign up for future newsletters here. 

Memfault is hosting its first launch week of the year! On Tuesday, March 12th, Memfault CEO François Baldassari will showcase how to evaluate the health and performance of your embedded devices clearly within Memfault's observability platform. Join the webinar to discover how simple it is to monitor three necessary device measures: stability, battery, and connectivity. Register today!