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Jeff Geerling

@jeffgeerling.com

Father, author, developer, maker. Sometimes called "an inflammatory enigma". #stl #ansible #k8s #raspberrypi #mac #crohns www.jeffgeerling.com

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09.06.2023
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Latest posts by Jeff Geerling @jeffgeerling.com

Thanks! Something definitely funky

08.03.2026 17:28 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

I don't care if it's DST or not, but every time change is a chore

08.03.2026 15:57 πŸ‘ 70 πŸ” 2 πŸ’¬ 4 πŸ“Œ 0

If 4 is good, how about 8? :)

08.03.2026 15:19 πŸ‘ 1 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
Can a radio engineer survive the tower in Fall?
Can a radio engineer survive the tower in Fall? YouTube video by Geerling Engineering

The movie 'Fall' has a radio tower in it. Don't let a radio engineer see it 🫣 www.youtube.com/watch?v=WGzr...

08.03.2026 14:55 πŸ‘ 30 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

It's still fun to have a rubidium oscillator to play with, if you can scrounge one from some old 5G equipment :)

Also, eventually, cesium!

08.03.2026 05:11 πŸ‘ 1 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
I built a PTP clock, and now I'm not sure what time it is
I built a PTP clock, and now I'm not sure what time it is YouTube video by Jeff Geerling

A man with a watch knows what time it is.

A man with two watches is never sure.

I built a PTP clock, and now I'm not sure what time it is.

Video: www.youtube.com/watch?v=7r-c...

06.03.2026 15:01 πŸ‘ 73 πŸ” 6 πŸ’¬ 7 πŸ“Œ 1

If you'll be there again in 2026... :)

05.03.2026 22:59 πŸ‘ 50 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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πŸ“ΉRecording DV over FireWire on a Raspberry Pi 5 via the prototype Firehat. More to come...

03.03.2026 23:05 πŸ‘ 99 πŸ” 4 πŸ’¬ 9 πŸ“Œ 0
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macOS Tahoe is still full of annoyances like this: a notification inside *System Preferences* that cannot be gotten rid of, and it causes the list to look janky, with weird spacing for the list item and a misaligned "2".

I'd be happy with Classic or Aqua over 'Glass'

03.03.2026 16:54 πŸ‘ 99 πŸ” 3 πŸ’¬ 14 πŸ“Œ 5

If MacEffects ever makes a color matched plastic apple drop-in for these things, they'll make mint lol.

03.03.2026 03:11 πŸ‘ 2 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

Oh how cute is that little guy! I want to build one in the 4-5" range, that looks like the original Mac... hopefully by next MARCHintosh I have some time for the design.

02.03.2026 21:54 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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Kicking off #MARCHintosh with the smallest Mac ever: the Pico Micro Mac!

Check out the video on Level 2 Jeff: www.youtube.com/watch?v=-gOS...

02.03.2026 21:21 πŸ‘ 113 πŸ” 15 πŸ’¬ 3 πŸ“Œ 2

Ooh can't wait!

01.03.2026 17:54 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

You should call it...

Apple Talk

01.03.2026 15:00 πŸ‘ 3 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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Companies are coming around to the appeal of mini racks :)

Exaviz sent their new Cruiser board to test, and DeskPi sent over their prototype mini rack mount for it. My experience upgrading my open source Pi NVR here: www.youtube.com/watch?v=2Lay...

27.02.2026 15:02 πŸ‘ 70 πŸ” 2 πŸ’¬ 4 πŸ“Œ 0

Haha if you know, you know.

26.02.2026 01:34 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Bias.

But I may have it down to 1ms by tomorrow morning. I'm letting a clock settle. Then on to microsecond, and eventually (hopefully) 40 ns.

26.02.2026 01:34 πŸ‘ 1 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

Did you ever have a day where you have one task.

And you open up the app, open the file...

Then spend 8 hours on a completely separate task, and wonder how it's already 5 pm?

(At least I got this particular clock down from 37 seconds off to 200ms off...)

25.02.2026 22:42 πŸ‘ 132 πŸ” 2 πŸ’¬ 18 πŸ“Œ 3
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re @anthropic.com:

I've identified industrial-scale copyright violations on my content by Anthropic, OpenAI, Google, X, and more.

These companies created thousands of crawlers incorporating the text of all my blog posts, open source code, and books into their paid AI models to profit exorbitantly.

24.02.2026 16:17 πŸ‘ 325 πŸ” 64 πŸ’¬ 12 πŸ“Œ 3
Preview
Raspberry Pi Pico 2W + Waveshare GPS: My Simple NTP Server Build G'day! A casual scroll on Youtube, I saw a video from Jeff Geerling about a Raspberry Pi Pico powered GPS clock. Go check out his blog for more details here and checkout his YouTube video on it. An...

Hi @jeffgeerling.com
I saw your Pico GPS clock and decided to make it into a NTP server with a Pico 2W.

GPS β†’ PPS β†’ Stratum-whatever, time over your network.
It's not the best but get a ~10-50ms accuracy after fix, over Wifi.

Full write up here.
www.rvault.cc/pico-ntp/

22.02.2026 18:03 πŸ‘ 37 πŸ” 3 πŸ’¬ 2 πŸ“Œ 0

Yes and now I have another clock build on my list haha

22.02.2026 22:05 πŸ‘ 2 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
Preview
a man with a mustache is saying it 's so it 's so beautiful ALT: a man with a mustache is saying it 's so it 's so beautiful
22.02.2026 22:04 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Looks great! Where did you find that 3D design??

20.02.2026 20:16 πŸ‘ 2 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
Overclocking Raspberry Pi Pico 2 Adventures with dry ice and RP2350 - how fast can it go? – Pimoroni Learning Portal

The madlads at @pimoroni.com overclocked an RP2350 microcontroller from the base clock of 150 Mhz to a whopping 861.6 MHz.

It looks like 400-500 MHz can be stable on most Pico 2s, which is still wild.

See: learn.pimoroni.com/article/over...

20.02.2026 15:05 πŸ‘ 90 πŸ” 15 πŸ’¬ 1 πŸ“Œ 0
AI is destroying open source, and it's not even good yet
AI is destroying open source, and it's not even good yet YouTube video by Jeff Geerling

Open source maintainers already had enough to worry about before the ongoing agentic AI revolution... my thoughts on recent AI-induced problems in open source development: www.youtube.com/watch?v=bZJ7...

16.02.2026 21:34 πŸ‘ 105 πŸ” 26 πŸ’¬ 6 πŸ“Œ 2
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Exaviz mini NAS/NVR CM5 board - includes 8x PoE, 2.5 Gbps uplink from Pi. Fits in a 10" mini rack, with an enclosure (not final version) from DeskPi. Testing it next week!

14.02.2026 21:00 πŸ‘ 79 πŸ” 1 πŸ’¬ 2 πŸ“Œ 0

Honestly I think we each liked different aspects equally. But the kids loved trying to make the conversation app mode do things like speak other languages, get confused, tell jokes, lol.

Kids definitely need supervision interacting with 'smart' things!

13.02.2026 23:07 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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Can a robot replace my parent-child interactions? It should be "utterly trivial"... but I found that not to be the case. The robot is still cool, though. Full video here: www.youtube.com/watch?v=yvBb...

13.02.2026 15:04 πŸ‘ 21 πŸ” 0 πŸ’¬ 3 πŸ“Œ 0
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Prepping for #Marchintosh...

13.02.2026 00:32 πŸ‘ 69 πŸ” 4 πŸ’¬ 3 πŸ“Œ 0

Ah, fine cinematic masterpiece there!

12.02.2026 21:14 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0