[chbot] Robotics Group meeting, 5 Idris Rd, 6-30pm, Monday 20 Feb 2023

[Robin Gilks]

Many thanks to all the comments and encouragement about my tunnel house
window opener.
I hadn't actually twigged that the diameter of the wire 'stacking'  wheels
was critical to their operation. Just total luck that the only material I
had to make the pulley centres was 25mm wide, the same as the tube used for
the windlass.
I've got a bit of tidying up to do on the polythene wheel spacers but I
expect to have the whole project completed by the end of the week ;)

Cheers


On Mon, Feb 20, 2023 at 9:48 PM Mark Atherton <markaren1 at xtra.co.nz> wrote:

> Hello everyone,
>
> Good turnout with 25 attendees, and lots of huddles-of tech-talk. $41 +
> change (in gold, and flat-money) collected and transferred into the
> robotics loose-change jar (for later banking).
>
> Lots of new faces; welcome everyone.
>
> All sales from the trading table should go into the brown box on the
> wall, and are directly for the benefit of our host club, Christchurch
> Amateur Radio Club, NZART Branch 05.
>
> Equipment donations are welcome for the trading table, but no CRT based
> product, printers, toner or items that are likely to be a disposal burden.
>
> With thanks on behalf of the group,
>
> Mark Atherton
>
> ----------------
>
> Mark talked about an uncommitted control surface with a main-matrix of 8
> x 8 push buttons and LEDs. Unit communicates using MIDI over USB and has
> a published interface spec. Four broken units were purchased on eBay for
> roughly the same price a single working one from TradeMe. Each unit had
> a (differently) broken USB connector. All have now been repaired.
>
> Mark also talked about a recently acquired 1080P HDMI video camera with
> C mount lens fitting. Interesting time evaluating various lenses using a
> test card and native 1080P monitor.
> Zoom lenses performed the poorest, with chromatic aberrations, and poor
> resolution at corner targets. Best performing lenses were small, fixed
> focal length. There was also common left/right blue/yellow aberration
> which could be a sensor issue.
>
> Graham brought in some custom-fabricated fiberglass front wings from a
> McClaren F5000 racing car; he talked about issues associated with their
> design and fabrication.
>
> Robin talked about progress with his motor-controlled greenhouse
> window-opening project. Progress is being made, the new design appears
> to work.
>
> William demonstrated his home-made dehumidifier; one of the more
> interesting looking pieces of kit we have seen for a while.
>
> Rudy talked about a trip to an auction-house in Ashburton who were
> selling off some vintage gaming equipment.
>
> Daren talked about the recent cyber-attack on the UK Royal Mail
> (international) group, and some of the unexpected conversations between
> attacker and victim.
>
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