[chbot] Robotics Group meeting, Monday 18 Nov 2019, 630pm, 5 Idris Road

[Andrew Errington]

Hi Mark,

That switch in the link is similar to mine, but it has a pushbutton too
(which someone asked about this evening). The ones I have were listed under
the original ALPS part number:
SRBM1L0800

I bought a batch of 20, which worked out at US$1.64 each (but hey, free
shipping!). A bit pricey, but they should integrate better with a
particular chip I want to use.

Andrew



On Mon, Nov 18, 2019, 22:31 Mark Atherton <markaren1 at xtra.co.nz> wrote:

> Hello everyone,
>
> Couple of new faces this evening; welcome.
>
> Good turnout with 25 attendees, and lots of huddles-of tech-talk. $37 +
> change (in gold, and flat-money) collected and transferred into the
> robotics loose-change jar (for later banking).
>
> Quick reminder: 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. 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, NZART Branch 05. Our host club also loves old hard drives, old
> network stuff and any old piles of copper wire you might want to dispose
> of :)
>
> With thanks on behalf of the group,
>
> Mark Atherton
>
> ============
>
> Mark talked a little about the frustrations of getting a UDMA-5 ATA
> interface running on an FPGA based bare-metal system. None of the 740+
> pages of the base standard 'T13 Project 1532D' are easy reading, and
> even required 25 page summary had some ambiguous drawings !
>
> Charles brought in some of his first test pieces and projects fabricated
> using his new Omeo CNC mill. These included some two-part wooden boxes
> with resin-inlay.
>
> William demonstrated his home-made analogue PABX system as well as an
> update on his home-made wrist watch project.
>
> Colin brought in his home-made TXT based temperature and humidity
> monitoring system. Appreciate a list of software-tools you used for this
> project please Col.
>
> Andrew E talked about a newly discovered type of rotary control, a
> 'rotary pulse switch'  something like
>
> https://www.alibaba.com/product-detail/Metal-shaft-rotary-pulse-switch-RS1002SCC0X_447250835.html
>
> Paul brought in a coaxial quad-copter, (X8 configuration), with a Sparky
> 2.0 controller. He talked through some of the interesting mind-bends
> associated with placing motors in line with contra-rotating blades, as
> well as controlling YAW etc.
>
> Andy brought in a home-made robot, complete with LIDAR. Unit is built on
> a low cost frame, and uses an ESP32 processor. Lots of interest in this
> project.
>
> Robin talked about his frustrating time DMA-ing Motion JPEG to/from a
> hardware accelerator. He also briefly mentioned that the system has
> about 14 concurrent DMAs rattling around...
>
>
>
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