Weeknotes

Week 708 – Traces

30th December 2024

Each week we’ll endeavour to publish some details of the interesting things that members of DoES Liverpool have been up to over the past seven days. You can find out a bit more about them in our introductory post.

And remember, if you’re involved with DoES Liverpool at all, let us know what you get up to so we can include it here!

Equitable Practice Trainer Accreditation

MadLab have asked us to share that they are “working with UCL’s Institute of Education to grow an international network of accredited trainers, who can build capacity in their regions for equitable and inclusive participation in informal STEM learning”.  Click here if you’re interested (and tell us if you decide to do the course!).

Things of Note

  • Adrian McEwen:Back on our hand-decoding USB from oscilloscope traces schtick.@huffeec pointed out that they’re Start-of-Frame packets rather than NAKs. (People who build protocols sending packets least-significant-bit first are even worse than those who use little-endian!)

    At least now I (think) we’re getting somewhere. Looks like the ESP32C3 is ignoring the computer for some reason.

    #weeknotes #ibal234 #ESP32 #electronics #USB

    An oscilloscope trace showing the tail end of one USB packet, a momentary pause, and then the start of the next one. That's indicated by two traces overlaid, which broadly show assorted square waves: one for D+ and one for D-, when they flip that shows a 0 and when they stay apart it indicates a 1; when both traces drop to their lowest points together that indicates the end of a packet. A couple of white cursor lines are also shown - they're set three bits apart to help as we scroll through the trace decoding the individual bits to then turn to bytes and then to USB packet types.

Coming Up in the Next Week

Monday 30 December, 7:00pm-9:00pm 7pm-9pm Socialist Alternative discussion group
Thursday 02 January, 7:00pm-11:00pm LivNUG (Liverpool Nix/NixOS User Group)
Thursday 02 January, 7:00pm-9:30pm Maker Night
Our free weekly evening meeting where you can find out about our space and all the making equipment in it, get a laser cutter or CNC embroidery machine induction, and work on projects from physical computing and electronics to 3d printing, routing and sewing. Just pay for materials used.
Saturday 04 January, 4:00pm-6:00pm DoES Liverpool Community Meeting aka. “Future Gazing”
Minutes from the previous meeting

Somebody Should

The DoES Liverpool to-do list is stored in the issues of our Somebody Should repository on github. Head over there if there’s something you’d like to report, or if you want to help out fixing things.

See all the issues…

Issue counts: 416 open, 1562 closed

No new issues

Featured issue: Rework power plug/sockets for Sheila. Can we move this on or close it?

No issues closed

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