Category: Uncategorized
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Testing Satellite Time Synchronization Across Seven T-Beams
<p>The LilyGO T-Beam Supreme has a real time clock, aka “RTC”, circuit powered by a small hidden rechargeable battery that can hold a charge for 2-3 days. If your T-Beam is without power from A) its larger battery, a 18650 Li-Ion battery or B) a powered USB connector, then your stored date and time value…
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Achieving 166 µs Clock Synchronization Across 7 T-Beams
After much effort, I finally achieved running 7 T-Beams for 17 minutes, and having them create internal clocks based on satellite pulse per second, aka “PPS”, and finding they spanned by 166 µs. One hurdle I had to overcome was a physical one: 1) the top of the T-Beam contains the GPS antenna which is…
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Shaving 8–9 Minutes Off Each Test Cycle
A recent dialog reminded me why having a powerful — and fun — Ryzen 7950-based system is helpful. I’m performing testing of hand-held radio units to see how mesh software, ostensibly Reticulum-based units, perform out in the field. The magic of mesh networks is that it can extend the range limits between two radio units.…
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Reticulum on Rust: Comparison Of Two Projects
<p><strong><span style="color: #ff0000;">highly technical</span></strong></p> <p>There are two projects that came to my attention where the Reticulum implementation is built using the Rust programming language. I know very little Rust, but I have been impressed with everything so far. Scott Lamb of the <a href="https://github.com/scottlamb/moonfire-nvr">Moonfire NVR</a> project has been suggesting I learn Rust since 2018, and…
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A Better Way to Record Timed Linux Terminal Sessions
<h2>Timed Terminal Captures with <code>script</code>, <code>timeout</code>, and a Future Launch Time</h2> <p>I recently needed to run the same command on two separate Raspberry Pi Zero 2W systems at almost exactly the same time. Both machines were disciplined to the same local stratum-1 time server, so their clocks were already close enough, e.g. less than 1…
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T-Beam Magnetometer Investigation
<p>5/1/2026 – <strong>Update</strong>: over 100k hits on my Forgejo server, presumably bots, so I now require sign-in to explore. Contact me if you want an account.</p> <h1>Introduction</h1> <p>This is a <em>deep technical</em> 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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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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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…