- The Problem of the Month
- Paul MacDougal: OSCCAL register in AVR processors
- Show & Tell
2018 has a good chance of seeing embedded development accelerate sharply. Best wishes to the interest group and the wider community during this new year.
GitHub, GitLab, and Atlassian BitBucket are all sites that offer git repository hosting. But if you create a repo named “Test” with BitBucket, then you copy/paste the slug URL and feed it to “git clone” as usual, the URL is forced to all lower case “test” and you end up with a clone of your repo in directory(folder) “test”. This stinks, for example, with common library directory naming conventions.
After thrashing around in the team settings, thinking I’d just missed the way to override the default URL, it occurred to me this might be a feature, not a bug. Sure enough:
(“Stash” is simply Atlassian’s downloadable repo hosting system, effectively giving a customer a “Bitbucket” system within their enterprise)
This is just a classic bug report pattern. Who knows what caused the Bitbucket architect to decide not to honor the name spelling when creating the slug (the text box holding the URL you copy from to do a clone). But, the fact that one can simply modify the URL and end up with a target directory with any pattern of upper/lowercase makes it clear that they COULD offer an “honor name capitalization” radio button to override their sacred cow default, but they choose not to, with the lamest of lame excuses:
“Given that it is possible to modify the clone URL to include a camel-cased repository name (which creates a camel-cased repository directory when cloning), this is unlikely to be a priority in the near future.”
But this latest submission was started in 2013 and “resolved” in 2015, two years ago. Maybe it’s time to submit it again.
- On October 20th Nordic Semiconductor is conducting an all-day seminar with members of their R&D organization on Friday, October 20th. They’ll cover the nRF52 chip series, Bluetooth 5, Bluetooth Mesh, and “802.15.4 and Thread: Mesh technologies for IoT applications”. They say somewhere that attendees will receive an nRF52 dev board. Registration here.
- Monday, November 1st at Duke University the IEEE/Robotics (aka TAR) meeting will offer a presentation about Duke’s humanoid robot project. (This is not the same as the IEEE project being done at the Forge Initiative ) Again: this meeting is not at NC State for November. Pizza and beverages at 6:20 pm, the program starts at 7 pm. Location, parking, and other details and painless “register now” button to gauge the pizza order are here. Program:
- Humans and Autonomy Lab – Humans’ Interaction with Autonomous Systems, by Dr. Michael Clamann
- Explainable AI, by Dr. Alexander Stimpson
- Experiment on Humans’ Trust in Risk-Aware Autonomy, by Dr. Lixiao Huang
- November 8th at the McKimmon Center at NC State will be PCB Carolina, “North Carolina’s Premier Electronics Trade Show”. They offer outstanding food, a range of technical presentations and many vendor and organization booths to do with PCB design and production, and electronic assembly as well as related vendor’s wares. Details here.
- Problem of the Month
- Paul presented his “sorting a mixture of colored marbles” mechanical+electronics problem and gathered ideas submitted by the attendees
- Details of problem-solving sessions are available here.
- LTSpice talk. The materials are on Carl’s GitHub repository here and he’ll update it as the project matures.
- Glenn Smith showed a charging base he build for his Ham Radio. There was a 3D printed (ABS plastic) base with a LiPo charger board inside. It plugs into his car dash (not via cigarette lighter port, but a more robust connection).
- Paul MacDougal showed his mushroom growing box. A plastic tub with a 12V fan, a CO2 sensor, and a DHT22 temperature/humidity sensor. An Arduino monitors the CO2 and turns on the fan at 800 ppm CO2 and turns off the fan at 750 ppm CO2.
- Paul MacDougal showed his pushup counter based on the horizontal ultrasound sensor technique suggested in the September meeting. It worked well “in the lab”, which has hardwood floors, but not so well on carpet. He will continue to develop this project.
- General discussion and final questions
A recent edition of “The Amp Hour” podcast had Chris and Dave interviewing “Sprite_tm” (aka Jeroen Domburg) of Espressif. Amongst all the other things this interesting Dutchman has accomplished, he added symmetric multiprocessing support to FreeRTOS on the ESP-32 (which has two identical 32 bit processors). I came completely unstitched hearing this toward the end of tantalizing news about the software tool chain available for this ESP8266 follow-on. Transparent multithreading with complete control over processor affinity (i.e. either bound or freely scheduled) was the final brush stroke painting a picture of superior infrastructure, open source accessibility and the usual unbeatable price point of the Espressif hardware. Wow.
- Sparkcon starts this weekend with “Geek Expo of Maker and Digital Arts” back at the Redhat Annex on Saturday from 11am to 5pm. And this just in. Adam and Dan will be there with this stuff:
- Raleigh Mini MakerFaire is September 23rd. Splatspace will have a learn to solder booth and other things to share. TriEmbed is passing this year but multiple folks will be attending with handouts.
- Problem of the Month
- Paul presented his “counting pushups” problem and gathered ideas submitted by the attendees
- Details of past problem solving sessions are available via the “Problem of the Month” main menu above. Or here.
- Home Automation Presentation
- What can we say? Ben stunned much of his audience, especially during the Q&A.
- Paul gave an update about his power over ethernet development project and his ongoing wrestling match with 802.3AF.
- Alex presented his “leg movement logging via accelerometer using European Data Format” project using a Teensy USB and open source tools and custom Python code. He gave everyone a great accounting of a typical development project based off open source starting points and got the final results he was after. The GitHub repository for his project is here.
- (No notes were taken: if you contributed something please drop a line on the email list so this can be back-filled!)
- General discussion and final questions
“I am Ben Goldberg, a 5th grader in Durham. I am proficient at programming in Arduino and Python and playing Pokemon GO. 😉
Come to the meeting and learn how to make a smart light that integrates with Apple HomeKit. This presentation, another Problem of the Month, and the usual discussions and show and tell are all in store. Meeting details
Today until 2pm is the second day of an open house of the area Triangle DIY Biology organization near Scrap Exchange in Durham. I was button-holed to “do something” at this event and decided the easiest thing to demonstrate would be how to hand solder fine pitch SMDs. TriEmbed info sheets are on hand and we’re also plugging SplatSpace. I’m using a little space at the popup to coordinate curation of Fred Ebeling’s Collection of electronic parts at SplatSpace.
Adam Haile and Dan Ternes of Maniacal Labs have been busy. By accident I came across their site on Tindie and see they have a new product. PiPixel is oriented toward Raspberry Pi enthusiasts who would like to work with smart RGB LED strips. It’s described in detail on their web site. This is a super low cost kit that would make an excellent beginning soldering project with a big payoff. Find all the details on the ‘Labs web site.