Category: Electronics
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Confirmed: Milk Jug Transducer Captures Train Infrasounds
<p>Today is a milestone for I have proven that a $35 Sensirion <a title="https://www.digikey.com/en/products/detail/sensirion-ag/SDP810-125PA/6605488?s=N4IgTCBcDaIMoBEAKAOAjABgLRrAViQEMQBdAXyA" href="https://www.digikey.com/en/products/detail/sensirion-ag/SDP810-125PA/6605488?s=N4IgTCBcDaIMoBEAKAOAjABgLRrAViQEMQBdAXyA" data-from-md="">SDP810-125PA</a> differential pressure transducer, connected to an ordinary empty milk jug, detected low-frequency pressure fluctuations coinciding with a freight train passing approximately 1,300 feet away.This physical setup of using back pressure on a transducer is based on the article by…
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Local AI Test: Understanding An Electronic Circuit Diagram
I’ve installed several artificial intelligence (“AI”) models on my own computers; I’m exploring the quality of responses from local AI and comparing the results. This test is simply this a screenshot and a prompt. This is the screenshot: This is the prompt: What can you tell me about this screenshot? what is in it and…
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My 1″ Geophone Tracked A Mighty Freight Train
I have been working and experimenting for several weeks with geophones, transducers, and spectral analysis software in furtherance of my Hyperscale Data Center Sound Monitor project. Freight trains are known to emit low-frequency and infrasonic energy, so I have made it my business to become a temporary train tracker. I’m currently collecting 330 samples/second from…
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Baby’s First Infrasound Detection
Absolutely extremely technical I have a Sensirion transducer (SDP810-125PA at DigiKey $30.85) hooked up to an ESP32-S (ESP32-S3 Feather 8MB with w.FL Antenna at Adafruit $17.50). The transducer is for capturing infrasounds (< 20 Hz). Today was a milestone: the transducer detected an infrasound — its first “baby.” I am building this experimental device inspired…
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MEMs Microphone Investigation
<p><strong>Technical / DIY</strong> — for those interested in do-it-yourself sound monitoring of hyperscale data centers and related circuitry</p> <p>I’ve been mulling over Preston Blackburn’s Remote Audio Monitor design (see <a href="https://salemdata.net/johnpress/?p=1223">Monitor Sounds From a Data Center?</a>) and assessing its ability to monitor infrasound (<20hz) and low frequencies between 20 Hz and 50 Hz. Blackburn uses…
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Monitor Sounds From A Data Center?
A recent article, “[t]he complex corporate web behind a \$3.2 billion AI data center When multiple companies are behind one project, who bears responsibility for problems?” published by Ars Technica at link, intrigued me. There was a reference to a resident living in a house built in 1892 who complained of the constant noise from…
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An In-House Text-to-Speech Service for ESP32 Projects
Making your ESP32 Talk. YouTuber Dronebotworkshop published a video “Text to Speech on ESP32 – Wit.ai & OpenAI TTS“. “Text to Speech” is often referred to by the acronym TTS. His solution encompasses using third-party services, specifically Meta and OpenAI. For Meta, you have to have an account and you create an application within your…
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Reticulum: A Precision Trace Among 7 Nodes
What actually happens inside a Reticulum mesh running over LoRa when two endpoints cannot communicate directly? I built a seven-node testbed using LilyGo T-Beam SUPREME units named AMY, BOB, CY, DAN, ED, FLO, and GUY. AMY and GUY exchange one encrypted “Hi” message per minute, while software-defined radio blocks force their traffic through the other…
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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…