Elektrine lite

← Feed

John Poole

VogueLaGalere@mastodon.online

<p>Retired principal software engineer with the world&#39;s largest database company. Retired lawyer. </p><p>Enthusiast of Gentoo Linux, Xen VMs, and single board computers (Raspberry, RISC-V). Perl does the trick.</p><p>Classical pianist, woodworker, gardener, cook, letterpress, photography, &amp; practical jokes.</p><p>Re: Follow request -- I want to know something about who follows me, so if your &quot;bio&quot; is empty, I&#39;ll deny the request.</p>

Posts

  • View post

    Baby&amp;#39;s first infrasound. My DIY #Infrasound experiment just produced a strong spectral feature at 3.95 Hz using a Sensirion SDP810 differential-pressure sensor + #ESP32. Did I detect a nearby train? A resonance/artifact from my 15&amp;#39; tube? Something else? I don&amp;#39;t know yet -- which means it&amp;#39;s time for more experiments. https://salemdata.net/johnpress/?p=1268 #DIY #CitizenScience #Acoustics #Sensors #OpenHardware #DataCenters

  • View post

    A 1-inch geophone on my basement slab just caught a mighty freight train passing about 1/4 mile away. I logged the night, found the event corresponding to my 3:34 AM eyewitness confirmation, and the seismic signal jumps dramatically. Next step: spectral analysis—how much of that ground motion is below 20 Hz? https://salemdata.net/johnpress/?p=1276 #Geophone #Seismology #Infrasound #ESP32 #DIY #DataCenters #SalemOR

  • View post

    My 1&amp;quot; geophone is telling me where the freight train energy is. Comparing a confirmed freight train with my quiet Salem baseline, I found strong sub-20 Hz ground vibration: around 10.7-10.9 Hz the maximum increased ~33 dB, and at 6.07 Hz the median increased ~21 dB. Next stop: field measurements far and near hyperscale data centers. https://salemdata.net/johnpress/?p=1288 #Geophone #Seismology #GroundVibration #FreightTrain #CitizenScience #DIYScience #DataCenters #SalemOR

  • View post

    A new saying: &amp;quot;Bots not here&amp;quot;

  • View post

    I&#39;ve decided to start a project to help neighbors of existing data centers and proposed data centers to monitor noise using &lt;$300 field units. I haven&#39;t built it yet, but I have done two other monitor projects with success, so I do not anticipate this will be any different... just a different set of variables and sensors. Here&#39;s a page introducing the HDC Sound Monitor Project. (Just this page for now.) https://salemdata.net/HDC/HDC_Sound_Monitor.html #DataCenters #DIY #Noise...

  • View post

    Migrated from Windows to Linux leaving a Brother P-Touch label printer behind? Your printer may still be useful and work in Linux despite no mfg Linux support. My decade-old Brother PT-2700 working on Gentoo Linux with both the command-line ptouch-print utility and the graphical ptouch-rs [Rust] application. I also built ptouch-rs successfully on a Raspberry Pi 4 running Raspberry Pi OS &quot;Trixie.&quot;. https://salemdata.net/johnpress/?p=1094 #Linux #Brother #PTouch #LabelPrinter #Gentoo...

  • View post

    &quot;summertime and the livin&#39; is easy&quot; #DogsOfMastodon #Dog #BerneseMountainDogs #Hydrangea #Gershwin