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John T (the GRA is silent)

@grajohnt.bsky.social

280 followers 560 following 410 posts

Vibe Personality Hire Geology PhD, maker of absurd things, radio, and other nonsense. Always interested in how we learn through failure. Also at grajohnt @chaos.social

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John T (the GRA is silent) @grajohnt.bsky.social · 18h

A little #RaspberryPiPico project with a DAC for sound effects, some lights, and a PIR for motion sensing.

Should be "fun" for the trick-or-treaters on #halloween!

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John T (the GRA is silent) @grajohnt.bsky.social · 2d

This is mostly a thought experiment, and LEDs have long been used as useful indicators in oscillator circuits, but LED noodles can be a useful tool to help "see" what's happening in a circuit.

John T (the GRA is silent) @grajohnt.bsky.social · 2d

Finally getting the #halloween decor sorted...

John T (the GRA is silent) @grajohnt.bsky.social · 3d

It's *my* car now, buddy...

(Yes, this is an invasive #brown #anole #lizard, and there's a constant back and forth war between them and the native green anoles)

John T (the GRA is silent) @grajohnt.bsky.social · 10d

Note that the P9P had a clear view of the sky for *hours* before this, and the eTrex hadn't even been turned on in at least a decade.

We've all gotten a bit comfortable with using phone GPS for navigation, but be extremely cautious doing so at the moment if you're on Android 16.

John T (the GRA is silent) @grajohnt.bsky.social · 10d

Heads up for any #Google #Pixel9Pro and potentially other #Android users. The Android 16 update seems to have fundamentally broken the ability for the GPS to get a lock in many situations.

Comparison between my ~20 yr old eTrex and my #P9P today - both with same view of the sky.

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John T (the GRA is silent) @grajohnt.bsky.social · 21d

Cue "dumb ways to die" music. Maybe that's not the vehicle to tailgate, buddy.

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John T (the GRA is silent) @grajohnt.bsky.social · 28d

The depth of cognitive dissonance it takes to get upset about what someone says about the death of an edgelord you liked really makes my head spin.

John T (the GRA is silent) @grajohnt.bsky.social · Sep 5

Currently being stalked in the cutest way possible (Hopi Chipmunk)

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John T (the GRA is silent) @grajohnt.bsky.social · Sep 1

A few of today's arthropod sightings in the Guadalupe Mountains. The last two were particularly chonky.

John T (the GRA is silent) @grajohnt.bsky.social · Sep 1

Desert sunset in thermal infrared pseudocolor - Guadalupe Mountains National Park

John T (the GRA is silent) @grajohnt.bsky.social · Aug 29

I'm not saying I don't use AAA batteries very often, but...these are the ones I just pulled out of the battery box to use.

John T (the GRA is silent) @grajohnt.bsky.social · Aug 26

Absolutely not.

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John T (the GRA is silent) @grajohnt.bsky.social · Aug 23

How it started: How it's going:

John T (the GRA is silent) @grajohnt.bsky.social · Aug 22

Turns out I had been self-medicating with copious coffee for my entire adult life.

John T (the GRA is silent) @grajohnt.bsky.social · Aug 22

I definitely get ebbs and flows, with the occasional couple weeks where it magically relents and I can get a ton done without deadline pressure. Been trying to find the trigger for that for years.

Also, quitting caffeine and being in that situation is what caused me to be diagnosed.

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John T (the GRA is silent) @grajohnt.bsky.social · Aug 22

If you want the easy route, modern phone cameras are astonishingly good at it. A stable mount is required (this was just laying flat on a wooden post). Electronically assisted astronomy (like the SeeStar) is also phenomenally good.

John T (the GRA is silent) @grajohnt.bsky.social · Aug 22

The nice thing about the middle of Australia is that it has extremely dark skies, and the center of the galaxy is straight up.

Picture from a Pixel 9 Pro

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John T (the GRA is silent) @grajohnt.bsky.social · Aug 20

What is it with commonwealth countries eating their national animals?

John T (the GRA is silent) @grajohnt.bsky.social · Aug 18

I was disappointed that this is actually a camper van rental place

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John T (the GRA is silent) @grajohnt.bsky.social · Aug 10

Is it fireproof? 😅

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John T (the GRA is silent) @grajohnt.bsky.social · Aug 10

Hackaday #Supercon tickets booked!

Who else is going?

John T (the GRA is silent) @grajohnt.bsky.social · Aug 8

Proposal for a new US economic system: poorest person gets a blue shell.

Reposted by John T (the GRA is silent)

Rachel Cole @rmartincole.bsky.social · Jan 29

All reports in this thread are from the collections of Northwestern University's Transportation Library. Materials we've digitized can generally be found in HathiTrust. Learn more and search our catalog here: www.library.northwestern.edu/libraries-co...

Text "United States Department of Agriculture. Transporting Watermelons in Bulk and Bin by Truck." Illustration of a semi truck with a watermelon as its trailer.

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John T (the GRA is silent) @grajohnt.bsky.social · Aug 7

I've spent the last few days playing with casting, mostly with a lot of humorous failures.

However, I just made the first cast I'm reasonably happy with!

This is bismuth, which has its own casting challenges, but is non-toxic and has a low melting point.