Author: John Poole
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T-Beam Magnetometer Investigation
5/1/2026 – Update: over 100k hits on my Forgejo server, presumably bots, so I now require sign-in to explore. Contact me if you want an account. Introduction This is a deep technical dive, possibly only of interest to people programming the LilyGO T-Beam SUPREME. Much of the working below are snippets taken from Wikipedia. What’s…
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Building A Better Mouse Trap
Our white house has one or more rats in it. We discovered a 2″ hole that apparently is their access. While traditional trapping and rat zappers work from time to time, preventing rats from entering is the priority. But, I don’t want to hinder their exit and I do not like resorting to traps, I’d…
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Printing in 3D An Exhaust Flange
I have been waylaid into 3D printing, not by choice, but by necessity. I’m building a Voron Trident 3D printer from a kit. Estimated time: 40 hours. I paid to have the 100-300 plastic parts required by the project printed by someone else since I did not already own a 3D printer. It took 3…
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Using Low-Cost GNSS Receivers to Pre-Qualify Survey Sites for NOAA OPUS
Motivation Most GNSS survey failures are not due to equipment—they are due to poor site selection. Survey-grade GNSS equipment paired with NOAA OPUS processing can achieve centimeter-level accuracy, but deployment is not trivial. Site quality—sky visibility, multipath, and obstruction—directly impacts results. The central question: Can low-cost GNSS receivers be used as a reconnaissance tool to…
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colorpie
I was working on my Voron Trident 3D printer kit, and tried to take inventory of all the plastic parts that were printed and shipped to me. There are 128 different designs. I decided to make a workflow producing both a recognizable image and a 3-D web viewer of each part. I ran into some…
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Hamburger Soup
When I was a lad in 4th grade, I took a substantial hit on my savings account at Union Bank in Pasadena to purchase a blender at Bullock’s for my mother as a Christmas present. A year or two earlier, I had opened an account at Union Bank because they had built a huge office…
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Battery Extractor Sling
I’ve been working with the LilyGO® T-Beam SUPREME ($41 not inc. shipping) which packs a punch with its: ESP32-S3FN8 processor with 8MB of RAM and 8MB of PSRAM a 128x64px OLED display a Lora radio transceiver a GPS sensor (either MAX-M10S or L76K ) Six-Axis Sensor Temperature, humidity and pressure sensor Magnetometer (compass) A power…
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Voron Trident: 3D Model
The above screenshot is a 3 dimensional (“3D”) model of the Voron Trident 3D printer that can be viewed in a web browser and manipulated with a mouse to rotate, zoom, and move the model in its space. If you are viewing on a hand held device, e.g. a phone, then the model may take…
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Extracting Links From PDF
Here’s a walk-through where I extract video link in a PDF and ascertain the length of the videos, their YouTube address, and their title. The 291 page Voron Assembly manual has links to helpful videos within it. Here’s a picture of such a link, https://voron.link/onjwmcd, from page 10 (intended to be read by a phone’s…
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“Over Hill Over Dale” by Thomas Gainsborough
I was sending a letter via First Class mail and a book via Media Rate, as a present, to a friend using the United States Postal Service. Both were sent at the same time in Salem to an address in Salem. My understanding is that mail gets delivered to Portland where it can be sorted,…