I am Elecia White alongside Christopher White. We’re here to chat about the interests, careers, and lives of engineers, artists, educators and makers. Our diverse guest list includes names you may have heard and engineers working quietly in the trenches. Either way, they are knowledgeable, enthusiastic, and inspiring.
We’d love to share our enthusiasm for science, technology, engineering, art, and math (STEAM).
347: Be Careful About the Bits
Chris (@stoneymonster) and Elecia (@logicalelegance) discuss API design and team dynamics. Elecia’s book: Making Embedded Systems Embedded Patreon StewMac (Ukulele kits) Transcript: embedded.fm/transcripts/347
346: You Have Everything You Need
Sophy Wong (@sophywong) creates projects she can wear and writes about them so others can make them as well. We talked about fashion, design, inspiration, and motivation. Sophy’s website is sophywong.com. We spoke about her book, Wearable Tech Projects. Check out her projects on Adafruit, Hackspace Magazine and Make Magazine. She also did a video interview with Tested. Sophy’s space suit was used in Saul’s King of Misery music video. Sophy has found inspiration in Debby Millman’s podcast Design Matters, Diana Eng’s Fashion Geek: Clothes Accessories Tech, and the work of Sagmeister. Transcript: embedded.fm/transcripts/346
345: Do What Apple Says
Gretchen Walker gave advice on creating a BLE iOS application. Gretchen wrote The Ultimate Guide to Apple’s Core Bluetooth on the PunchThrough (@PunchThrough) blog. There are many other good posts on the blog about BLE from a device perspective and app development (iOS and Android). PunchThrough also makes LightBlue, a great BLE debugging app you can find wherever you find your mobile apps. PunchThrough is hiring embedded software engineers in the Minneapolis, MN area. Chris and Gretchen both recommend Ray Wenderlich’s site for learning about Swift. Chris also liked the Big Nerd Ranch books: iOS Programming and Swift Programming. Elecia liked the NovelBits.io writeup about getting maximum throughput on BLE. Apple Accessory Design Guide
220: Cascading Waterfall of Lights (Repeat)
Ben Hencke (@im889) spoke with us about OHWS, Tindie, and blinking lights. Ben sells his Pixelblaze WiFi LED controller on his ElectroMage store on Tindie. It is based on the ESP8266 and uses the DotStar (APA102) lights. To hear John Leeman’s trip report on the Open Hardware Summit (OHWS), listen to Don’t Panic Geocast, Episode 140 – “Juicero of Tractors” Ben’s websites are bhencke.com and electromage.com. Go there if you want to see some of Ben’s projects, including Synthia. You can also find Ben on Hackaday, Github, and YouTube. We talked with Charles Lohr about ESP8266 WiFi controlled lights and ColorChord on Embedded.fm episode 102: The Deadly Fluffy Bunny (With WiFi). Laser cut mandalas OSHPark Small Batch Assembly More about the 4-bit Radio Shack computer (and an Arduino-based emulator for it!) Santa Cruz Idea Fab Lab
344: Superposition, Entanglement, and Interference
Kitty Yeung (@KittyArtPhysics) spoke with us about the superposition of quantum computing and fashion. If you want to learn more about quantum computing, check out Kitty’s series on Hackaday’s Quantum Computing Through Comics. Kitty works for Microsoft in Quantum Computing (@MSFTQuantum). Kitty’s art and fashion are available on her site, Art By Physicist, and shop shop.kittyyeung.com. Her recent addition is the Constellation Dress. There is a coupon code in the show. Kitty has some other DIY fashion projects: Made of Mars and Saturn Dress. @artbyphysicist on Instagram LinkedIn
343: Getting Brains to Work
Chris and Elecia discuss transcripts, listener emails, and brains. We already have a post about the dangers of using Arduino for professional work. Elecia got a Cricut Maker to help her make origami and then discovered SVG files were editable (Intro to SVG). She’s putting her origami crease patterns in a github repo eleciawhite/origami), where else would you put it? About brains, Elecia was reading from Smart But Scattered.
342: That Girl's Brain
Jess Frazelle (@jessfraz) of Oxide Computer (@oxidecomputer) spoke with us about hyperscalers (large companies that make their own datacenter server hardware) and podcasts. Jess wrote an article about the power efficiency measurements of datacenter servers: Power to the People (ACM Queue August 2020). The Oxide podcast is available on oxide.computer/podcast as well as your usual podcast apps. Jess particularly recommended the episode with Jonathan Blow. Oxide is working to make hyperscaler-style hardware available to everyone. Their goal is to open source all their hardware and software: github.com/oxidecomputer. They use the Rust language for much of their development. Jess has a blog: blog.jessfraz.com Rust
236: The Concept of Delayed Gratification (Repeat)
Roger Linn (@roger_linn) gave us new ideas about musical instruments, detailing how wonderful expressive control, 3D buttons, and keyscanning can be. Roger’s company is Roger Linn Design. We talked extensively about the LinnStrument, some about the AdrenaLinn for guitar, and only a little bit about the analog drum machine Tempest. A key matrix circuit is a popular way to handle a large number of buttons but it falls prey to n-key rollover. Roger adds force sense resistors to this (FSR example at Sparkfun). If you have an idea for an instrument, Roger has already written his response to your request for a prototype. Roger gave a keynote address at ADC '16 about the LinnStrument, including showing the sounds it can make. OHMI Trust is the one handed musical instrument society enabling music making for everyone. Roger mentioned some other expressive instruments including: Roli Seaboard Haken Continuum Madrona Labs Soundplane Eigenharp
341: Big Hugs to Everybody
Phoenix Perry (@phoenixperry) returns to speak with us about education and the importance of merging art and technology. Phoenix’s website is phoenixperry.com. The art installation crossing the virtual and the physical world was called Forest Day Dream. Phoenix is teaching a free online class: Create Expressive Video Games. Phoenix is the Master’s degree coordinator for University of the Arts London Creative Computing Institute. Diversity and accessibility are important, some resources: FeministInternet.org We Are Not Users: Dialogues, Diversity, and Design Archaeologies of Touch: Interfacing with Haptics from Electricity by David Paris Critical Play: Radical Game Design by Mary Flanagan Weapons of Math Destruction: How Big Data Increases Inequality and Threatens Democracy by Cathy O'Neil Gone Home (Steam game) Her Story (Steam game) Bury me, my Love (Mobile game) #selfcare (Mobile game) Phoenix was previously on Embedded 204: Abuse Electricity
340: The Left Bunny Slipper
Chris and Elecia talk about getting transcriptions, accessibility, operating systems, and networking. Elecia recommends reading Haben by Haben Girma (@HabenGirma). Transcripts will initially be only available to Patreon supporters. To become a Patreon supporter, go to patreon.com/embedded. If you can’t be a supporter and still really want the transcripts, hit the contact link. Chris Gammell’s nifty new podcast (video!) is Contextual Electronics. Want to know more about how operating systems work? Listeners recommended Miro Samek’s video series. Chris answered some questions about LISP networking. More information about the layers of the network can be found in the OSI model. The mobile focused LISP project that Chris worked on is now at openoverlayrouter.org and has pointers for more documentation and code.
339: Integrity of the Curling Club
Dan Zimmerman (@dmz) spoke with us about voting, voting machines, building trust in software, and transparency. Dan works for Galois (https://galois.com/ , @galois) and Free and Fair (https://freeandfair.us/, @free_and_fair). He worked on the US Vote Foundation’s E2E-VIV Project on the Future of Voting. The artifacts from that project are on github: github.com/GaloisInc/e2eviv. Dan (and Galois) worked with Microsoft on ElectionGaurd, a suite of tools to help make elections end-to-end verifiable, The tools are open source: github.com/microsoft/electionguard The Helios verifiable online election system is also open source: github.com/benadida/helios-server We failed to talk about the DARPA SSITH and FETT programs but if you are still reading the show notes, they might be of interest. We also didn’t talk about the National Academies report on Securing the Vote.
338: Working With People Is Terrible
In a surprising turn of tables, Christopher White (@stoneymonster) joins the show as a guest to talk about his career, burnout, and musical instruments. Christopher attended Harvey Mudd College for his undergrad mathematics degree then got a Master’s degree in physics at San Jose State University. Some things he has worked on include: Multicast OSPF LISP OCT His current band is 12ax7 (12ax7.fm). The outro music is a track called “Solstice”.
337: Not Completely Explode
Kate Temkin (@ktemkin) explained USB: how to get started, general orientation, useful tools, and when you’d use it in embedded systems. Kate’s website is ktemkin.com. She works at Great Scott Gadgets. References for USB: USB in a Nutshell USB Complete by Jan Axelson USB Embedded Hosts: The Developer’s Guide by Jan Axelson USB Specification, Chapter 9: USB Device Framework USB Stacks we talked about: TinyUSB from Adafruit Lufa Cortex libopencm3 For the host side: libusb Open Source VIDs are available from Openmoko and Pid.codes Kate recently gave a talk about making USB accessible. Part of the talk was about Luna, an FPGA based USB multitool. Some open source FPGA tools: Symbiflow.github.io Yosys: http://www.clifford.at/yosys/
336: Common Sense Is Not Common Sense
Philana Benton (@TechnoPHILiANA) spoke with us about mentoring: how to be a good mentor, what to expect, and what not to do. If you’d like to try mentoring, sign up for Philana’s DivTekSpace (divtekspace.org). You can do a resume review, a mock interview, give career advice, and/or refer students to your company. Philana’s home page is philanaaurelia.com We also mentioned imentor.org
335: Patching on the Surface of Mars
Joel Sherrill (JoelSherrill) spoke with us about choosing embedded operating systems and why open source RTEMS (RTEMS_OAR) is a good choice. Embedded #307: Big While Loop: Chris and Elecia talk about when and where they’d use RTOSs Embedded #93: Delicious Gumbo: Joel gave an introduction to the RTEMS RTOS Joel works at OAR Corp (oarcorp.com) on RTEMS (rtems.org). RTEMS runs on many development boards including the BeagleBone, Raspberry Pi, and two FPGA boards: ARM ZYNQ-7000 and the Arty Board. Joel recommends the operating systems book by Alan Burns and Andy Wellens. It comes in many flavors and editions including Real Time Systems and Programming Languages: Ada 95, Real-Time Java and Real-Time C/POSIX (3rd Edition). NASA Core Flight System (https://cfs.gsfc.nasa.gov/) Experimental Physics and Industrial Control System (EPICS) (https://epics-controls.org/)
226: Camp AVR Vs. Camp Microchip (Repeat)
Jay Carlson (@jaydcarlson), author of The Amazing $1 Microcontroller, joined us to talk about comparing microcontrollers and determining our biases. This was an in-depth comparison of different micro features. Jay is an electrical engineer specializing in electronics design and embedded programming (contact). His blog is new and interesting. We talked to SEGGER’s Dirk Akeman about JLink on #218: Neutron Star of Dev Boards.
334: Bag of Heuristics
Matt Godbolt (@mattgodbolt) joined us to talk about assembly code, becoming a verb, 6502s, exploring compilers, and application binary interfaces. Compiler Explorer can be found at godbolt.org. The code is on github (compiler-explorer/compiler-explorer). Matt also has jsbeeb, a BBC Micro (6502) simulator. You can try it out at bbc.godbolt.org. Its code and more information is on github (mattgodbolt/bbc-micro-emulation). Matt recently gave a video presentation about jsbeeb for ABUG. Some other videos that may be of interest: CppCon 2016: Jason Turner “Rich Code for Tiny Computers: A Simple Commodore 64 Game in C++17” Matt’s YouTube videos on using Compiler Explorer Just enough Assembly for Compiler Explorer - Anders Schau Knatten CppCon 2017: CB Bailey “Enough x86 Assembly to Be Dangerous” CppCon 2017: Carl Cook “When a Microsecond Is an Eternity: High Performance Trading Systems in C++” The best compiler book seems to be The Dragon Book. Hyrum’s Law on writing interfaces. Application Binary Interface (ABI)
333: Project Purgatory
Bailey Steinfadt (@baileysteinfadt) spoke with us about the makerspaces, communities, following many paths, and misbehaving robots. Bailey works at Dojo Five and Stone Path Engineering. Area 515 is a non-profit maker space in the Des Moines, Iowa area. They supported their local emergency services with over 6000 face shields. If you are looking for something to do with your 3d printer, look at One Shot Bias Tape Maker and the how to use it video. Bailey recommended the Makers On Tap podcast and grill mats for soldering. Elecia recommended the You Can Do It!: The Merit Badge Handbook for Grown-Up Girls as a book she’s only picked up once in a bookstore years ago but has thought about as an excuse to pick up new skills.
332: There Were Fires
Doug Harriman of Simplexity (@SimplexityPD) spoke with us about motors, controllers, and designing mechatronic systems. Simplexity (or if you want to contact them) Doug recommends Control Systems Engineering by Norman S. Nise. Elecia recommends Notes on Diffy Qs by Jiří Lebl from American Institute of Mathematics list of free and approved math textbooks. They both like the 3 Brown 1 Blue YouTube channel. If you liked the part about how to choose a motor, you might want to watch Doug’s Webinar on DC Motors & Motion Control Systems (you’ll have to give your info to see it).
331: Friendly Tea Kettle
Dr. Katy Huff (@katyhuff) spoke with us about nuclear engineering, effective software development, and the apropos command. Katy wrote an O’Reilly book describing Python software development to scientists: Effective Computation in Physics: Field Guide to Research with Python. She has been involved with Software Carpentry. Katy is a professor at University of Illinois, Urbana-Champaign, Department of Nuclear, Plasma, and Radiological Engineering. She uses Bell and Glasstone’s Nuclear Reactor Theory in her Nuclear Reactor Theory class. Katy’s personal site Stellerator Godiva Device Janelle Shane creates the AI Weirdness blog. (She was also a guest in #275: Don’t Do What the Computer Tells You.)
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