<div dir="ltr">Hi Bevan,<div> Most head torches have a little buck or boost converter, so I assume this is giving the interference?? Easiest option would be to run the LED's directly from a battery (with a small resister in series) which should not give any interference. Only downsides being the LED will go dimmer as the battery gets low, and the slightly less efficient.</div><div>Does that help?</div><div>/s</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, 26 Jun 2019 at 10:43, Bevin Brett <<a href="mailto:bevin_brett@hotmail.com">bevin_brett@hotmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div>
<div dir="auto">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
<div dir="auto"><br>
</div>
<div dir="auto">But they can't use LED lights at night because of interference. </div>
<div dir="auto"><br>
</div>
<div dir="auto">How easy would it be to shield a normal commercial head lamp?</div>
<div dir="auto"><br>
</div>
<div dir="auto">Wrap it in alfoil? Small metal mesh? Mesh with some trivial circuit?</div>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Jun 17, 2019 11:00 PM, <a href="mailto:chchrobotics-request@lists.ourshack.com" target="_blank">chchrobotics-request@lists.ourshack.com</a> wrote:<br type="attribution">
<blockquote class="gmail-m_4218044085924964833quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<p dir="ltr">Send Chchrobotics mailing list submissions to<br>
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<p dir="ltr">When replying, please edit your Subject line so it is more specific<br>
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<p dir="ltr">Today's Topics:</p>
<p dir="ltr"> 1. Sipeed MAix BiT for RISC-V AI+IoT - Seeed Studio (Synco Reynders)<br>
2. Robotics Group meeting, Monday 17 June 2019, 630pm, 5 Idris<br>
Road (Mark Atherton)<br>
</p>
<p dir="ltr">----------------------------------------------------------------------</p>
<p dir="ltr">Message: 1<br>
Date: Mon, 17 Jun 2019 21:58:00 +1200<br>
From: Synco Reynders <<a href="mailto:synco.reynders@gmail.com" target="_blank">synco.reynders@gmail.com</a>><br>
To: Christchurch Robotics <<a href="mailto:chchrobotics@lists.linuxnut.co.nz" target="_blank">chchrobotics@lists.linuxnut.co.nz</a>><br>
Subject: [chbot] Sipeed MAix BiT for RISC-V AI+IoT - Seeed Studio<br>
Message-ID:<br>
<CAKNOA8J=<a href="mailto:UrmPOjVwfwNP2rSkEMrbngRt-6-cTCTMUUuk098ogg@mail.gmail.com" target="_blank">UrmPOjVwfwNP2rSkEMrbngRt-6-cTCTMUUuk098ogg@mail.gmail.com</a>><br>
Content-Type: text/plain; charset="utf-8"</p>
<p dir="ltr">Here is the link to where I bought the board...<br>
<a href="https://eur04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.seeedstudio.com%2FSipeed-MAix-BiT-for-RISC-V-AI-IoT-1-p-2873.html&data=02%7C01%7C%7C9de3110e1bff46b5abc008d6f312f8d3%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636963660150070012&sdata=LhJuCO%2BfUC%2FicknxuIrv0qAXU8fsIgi8qLqWfAAKGqg%3D&reserved=0" target="_blank">https://eur04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.seeedstudio.com%2FSipeed-MAix-BiT-for-RISC-V-AI-IoT-1-p-2873.html&data=02%7C01%7C%7C9de3110e1bff46b5abc008d6f312f8d3%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636963660150070012&sdata=LhJuCO%2BfUC%2FicknxuIrv0qAXU8fsIgi8qLqWfAAKGqg%3D&reserved=0</a></p>
<p dir="ltr">Data sheet for the K210<br>
<a href="https://eur04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.google.com%2Furl%3Fsa%3Dt%26source%3Dweb%26rct%3Dj%26url%3Dhttps%3A%2F%2Fs3.cn-north-1.amazonaws.com.cn%2Fdl.kendryte.com%2Fdocuments%2Fkendryte_datasheet_20181011163248_en.pdf%26ved%3D2ahUKEwiW-PPrjPDiAhW96nMBHRBbAecQFjABegQIBxAB%26usg%3DAOvVaw3CVZJWXlKkFgXPVCf8L4Ts%26cshid%3D1560765344956&data=02%7C01%7C%7C9de3110e1bff46b5abc008d6f312f8d3%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636963660150070012&sdata=YtKt%2FRVCAZVXedlQd9dOBnCe13RRwBaBAQrCjHelSu8%3D&reserved=0" target="_blank">https://eur04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.google.com%2Furl%3Fsa%3Dt%26source%3Dweb%26rct%3Dj%26url%3Dhttps%3A%2F%2Fs3.cn-north-1.amazonaws.com.cn%2Fdl.kendryte.com%2Fdocuments%2Fkendryte_datasheet_20181011163248_en.pdf%26ved%3D2ahUKEwiW-PPrjPDiAhW96nMBHRBbAecQFjABegQIBxAB%26usg%3DAOvVaw3CVZJWXlKkFgXPVCf8L4Ts%26cshid%3D1560765344956&data=02%7C01%7C%7C9de3110e1bff46b5abc008d6f312f8d3%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636963660150070012&sdata=YtKt%2FRVCAZVXedlQd9dOBnCe13RRwBaBAQrCjHelSu8%3D&reserved=0</a><br>
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<p dir="ltr">------------------------------</p>
<p dir="ltr">Message: 2<br>
Date: Mon, 17 Jun 2019 22:01:46 +1200<br>
From: Mark Atherton <<a href="mailto:markaren1@xtra.co.nz" target="_blank">markaren1@xtra.co.nz</a>><br>
To: Christchurch Robotics <<a href="mailto:chchrobotics@lists.linuxnut.co.nz" target="_blank">chchrobotics@lists.linuxnut.co.nz</a>><br>
Cc: Ian MacPherson <<a href="mailto:ian@macpherson.gen.nz" target="_blank">ian@macpherson.gen.nz</a>>, Rory Deans<br>
<<a href="mailto:rory1@xtra.co.nz" target="_blank">rory1@xtra.co.nz</a>><br>
Subject: [chbot] Robotics Group meeting, Monday 17 June 2019, 630pm, 5<br>
Idris Road<br>
Message-ID: <<a href="mailto:6d4a8ac1-ad6c-fd28-1197-0fa30423c467@xtra.co.nz" target="_blank">6d4a8ac1-ad6c-fd28-1197-0fa30423c467@xtra.co.nz</a>><br>
Content-Type: text/plain; charset=utf-8; format=flowed</p>
<p dir="ltr">Hello everyone,</p>
<p dir="ltr">Enthusiastic turnout with 20 attendees, and lots of huddles-of <br>
tech-talk. $28 + change (in gold, and flat-money) collected and <br>
transferred into the robotics loose-change jar (for later banking).</p>
<p dir="ltr">Quick reminder: equipment donations are welcome for the trading table,
<br>
but no products that are likely to be a disposal burden such as <br>
printers, toner or similar. All sales from the trading table should go <br>
into the brown box on the wall, and are directly for the benefit of our <br>
host club, NZART Branch 05.</p>
<p dir="ltr">With thanks on behalf of the group,</p>
<p dir="ltr">Mark Atherton</p>
<p dir="ltr">============</p>
<p dir="ltr">Bevin brought along a soviet mechanical calculator to talk about as well
<br>
as quite a photographic tour of one of his latest mechanical calculator <br>
repair projects. Challenges include trying to drift out a (possibly cold <br>
welded) taper pin. All in all, quite a mission…</p>
<p dir="ltr">William brought in a homemade intercom using old telephones. Controller
<br>
is based around an Arduino Nano. Nice recycling project.</p>
<p dir="ltr">Peter Harris talked about switched mode power supplies, more <br>
specifically a battery management system for a home-made wall-of-power. <br>
Quite a discussion ensued around how to spread load across ten high <br>
voltage constant-current sources.</p>
<p dir="ltr">Synco talked about a tiny 64 bit image recognition module. This US$21
<br>
module includes VGA camera, a small LCD display and a CPU module. The <br>
main rub is that the CPU is RISC-V based running at 800MHz, with masses <br>
of I/O. The unit is configurable using a small FPGA, and is running a <br>
port of a micro-python wrapper controlling an embedded image-processing <br>
package.</p>
<p dir="ltr">Andy Gardner talked about his +-100kV volt meter !<br>
<br>
<br>
<br>
</p>
<p dir="ltr">------------------------------</p>
<p dir="ltr">Subject: Digest Footer</p>
<p dir="ltr">_______________________________________________<br>
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Meetings usually 3rd Monday each month. See <a href="https://eur04.safelinks.protection.outlook.com/?url=http%3A%2F%2Fkiwibots.org&data=02%7C01%7C%7C9de3110e1bff46b5abc008d6f312f8d3%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636963660150070012&sdata=Bg2lYcFqAA%2F5JrV6Cmwih2gwTM7G5c%2BbWGJ%2FayDtDzU%3D&reserved=0" target="_blank">https://eur04.safelinks.protection.outlook.com/?url=http%3A%2F%2Fkiwibots.org&data=02%7C01%7C%7C9de3110e1bff46b5abc008d6f312f8d3%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636963660150070012&sdata=Bg2lYcFqAA%2F5JrV6Cmwih2gwTM7G5c%2BbWGJ%2FayDtDzU%3D&reserved=0</a>
for venue, directions and dates.<br>
Please edit your Subject line to reflect new subjects. </p>
<p dir="ltr">------------------------------</p>
<p dir="ltr">End of Chchrobotics Digest, Vol 141, Issue 4<br>
********************************************<br>
</p>
</blockquote>
</div>
<br>
</div>
</div>
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Meetings usually 3rd Monday each month. See <a href="http://kiwibots.org" rel="noreferrer" target="_blank">http://kiwibots.org</a> for venue, directions and dates.<br>
When replying, please edit your Subject line to reflect new subjects.</blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr" class="gmail_signature"><div dir="ltr">Synco Reynders<div> m: +64 21 1825332</div><div> e: <a href="mailto:synco.reynders@gmail.com" target="_blank">synco.reynders@gmail.com</a></div></div></div>