Embedded Logical Elegance

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. 
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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.
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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.
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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. 

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.
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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. 
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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 Goerthe’s Incompleteness Theorem
Physical Logic Game: Turing Tumble - Build Marble-Powered Computers
Mathematics of Paper Folding (Wikipedia)
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