[TriEmbed] TriEmbed Digest, Vol 71, Issue 14

[Chip McClelland]

Charlie,

I am not sure if this is your issue but, when I was working with an
Adafruit GPS module, I ran into issues that came from noise on the power
line.  Perhaps your camera is doing something that requires is spike in
current (like writing to an SD Card) and that noise is a second order
effect.

In my case, I added a regulator for the GPS breakout which fixed the
issue.  Other folks experiencing this issue on this thread.
<https://forums.adafruit.com/viewtopic.php?f=19&t=51542&start=15>

Good luck,

Chip



On April 30, 2019 at 6:50:40 PM, triembed-request at triembed.org (
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Today's Topics:

1. GPS/RF issue (Charles West)


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Message: 1
Date: Tue, 30 Apr 2019 10:33:52 -0400
From: Charles West <crwest at ncsu.edu>
To: TriEmbed <triembed at triembed.org>
Subject: [TriEmbed] GPS/RF issue
Message-ID:
<CAGojqSkzBjL_JT_kC6TFfRg3rk6_FsRjAsXSSzx8KzSXRWrH7A at mail.gmail.com>
Content-Type: text/plain; charset="utf-8"

Hello from the North!

I'm still working on the golf course robot. Recently I've run into a
rather odd issue. When I put everything together for my 1/8 scale RC car
platform, my GPS module refused to converge. I spent a solid 4 days
debugging it only to eventually discover that the problem appeared to be
that my USB 3 camera was putting out large amounts of RF interference of a
spectrum suitable to interfere with my GPS even when there was a metal
ground plane between the GPS and the rest of the equipment.

Eventually, a combination of wrapping the camera in metal tape, placing the
GPS with a ground plane elevated way above the rest of the robot and
wrapping the camera's cable in aluminum foil finally got the GPS to
converge. The only problem is, the accuracy of the GPS is far worse than
in the previous version of the robot. Originally, I got within a 2-3
meters with an occasional drift. Now it squiggles all over the place.

Does anyone know what I should try next to get decent performance and/or
hunt down any interference for the GPS?

Thanks,
Charlie West
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