[chbot] Chchrobotics Digest, Vol 141, Issue 4

Bevin Brett bevin_brett at hotmail.com
Tue Jun 25 23:42:47 BST 2019

Talking to my daughter who is involved in kiwi conservation.  They track, find kiwi using small transmitters on the bird leg and the teams carry a directional receiver with About a one metre antenna

But they can't use LED lights at night because of interference.

How easy would it be to shield a normal commercial head lamp?

Wrap it in alfoil?  Small metal mesh? Mesh with some trivial circuit?

On Jun 17, 2019 11:00 PM, chchrobotics-request at lists.ourshack.com wrote:

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Today's Topics:

   1. Sipeed MAix BiT for RISC-V AI+IoT - Seeed Studio (Synco Reynders)
   2. Robotics Group meeting, Monday 17 June 2019, 630pm, 5 Idris
      Road (Mark Atherton)


Message: 1
Date: Mon, 17 Jun 2019 21:58:00 +1200
From: Synco Reynders <synco.reynders at gmail.com>
To: Christchurch Robotics <chchrobotics at lists.linuxnut.co.nz>
Subject: [chbot] Sipeed MAix BiT for RISC-V AI+IoT - Seeed Studio
<CAKNOA8J=UrmPOjVwfwNP2rSkEMrbngRt-6-cTCTMUUuk098ogg at mail.gmail.com>
Content-Type: text/plain; charset="utf-8"

Here is the link to where I bought the board...

Data sheet for the K210
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Message: 2
Date: Mon, 17 Jun 2019 22:01:46 +1200
From: Mark Atherton <markaren1 at xtra.co.nz>
To: Christchurch Robotics <chchrobotics at lists.linuxnut.co.nz>
Cc: Ian MacPherson <ian at macpherson.gen.nz>, Rory Deans
<rory1 at xtra.co.nz>
Subject: [chbot] Robotics Group meeting, Monday 17 June 2019, 630pm, 5
Idris Road
Message-ID: <6d4a8ac1-ad6c-fd28-1197-0fa30423c467 at xtra.co.nz>
Content-Type: text/plain; charset=utf-8; format=flowed

Hello everyone,

Enthusiastic turnout with 20 attendees, and lots of huddles-of
tech-talk. $28 + 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 products that are likely to be a disposal burden such as
printers, toner or similar. 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.

With thanks on behalf of the group,

Mark Atherton


Bevin brought along a soviet mechanical calculator to talk about as well
as quite a photographic tour of one of his latest mechanical calculator
repair projects. Challenges include trying to drift out a (possibly cold
welded) taper pin. All in all, quite a mission…

William brought in a homemade intercom using old telephones. Controller
is based around an Arduino Nano. Nice recycling project.

Peter Harris talked about switched mode power supplies, more
specifically a battery management system for a home-made wall-of-power.
Quite a discussion ensued around how to spread load across ten high
voltage constant-current sources.

Synco talked about a tiny 64 bit image recognition module. This US$21
module includes VGA camera, a small LCD display and a CPU module. The
main rub is that the CPU is RISC-V based running at 800MHz, with masses
of I/O. The unit is configurable using a small FPGA, and is running a
port of a micro-python wrapper controlling an embedded image-processing

Andy Gardner talked about his +-100kV volt meter !


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End of Chchrobotics Digest, Vol 141, Issue 4

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