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Cake day: 2024年2月1日

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  • qjkxbmwvz@startrek.websitetoScience Memes@mander.xyzCoffee ☕
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    3 天前

    You can/could also find Coffee HOWTO in your distro’s HOWTO package. (I found a reference back to v0.5 of the document in 1998.)

    Has simple schematics to get you started for the hardware, using the parallel port to toggle relays.

    It’s a very neat little document, and inspired me to write a simple kernel module so I could echo 1 | sudo tee /sys/whatever/coffee0 to turn pin 0 high on the parallel port. (This is silly, and it’s much easier to just do things in user space!)




  • Cool, I recommend it!

    I have my public facing reverse proxy point to my public services, and I also have it set up as a “roadwarrior” VPN to my home. So, I can connect my phone via WireGuard to my VPS, and a local DNS resolves my private services to the private IP addresses in my home network (so, I also run a reverse proxy on my server, for internal services).

    I also have an off-site backup using this — just a raspberry pi and an HDD at family’s, that rsyncs+snapshots over the WireGuard network.

    I’m sure I’m not following all the best practices here, but so far so good.






  • Something that I found super interesting learning about amateur (ham) radio was that antennas don’t always work “backwards” as you’d expect. From Maxwell’s equations they obey reciprocity, so it stands to reason (or so I thought) that an antenna that’s good at receiving is also good at transmitting.

    But it’s not true! It turns out that the noise floor of the environment — in part due to atmospheric stuff like lightning — is so much higher than the sensitivity of radios (well above thermal/Johnson noise) that an inefficient antenna can be a really good antenna for receiving, in certain circumstances. Namely, if a receive antenna is inefficient but has good directionality, it can be useful…but probably no good for transmission!

    It’s not super profound or anything, but I found it pretty interesting.



  • I switched to Technitium and I’ve been pretty happy. Seems very robust, and as a bonus was easy to use it to stop DNS leaks (each upstream has a static route through a different Mullvad VPN, and since they’re queried in parallel, a VPN connection can go down without losing any DNS…maybe this is how pihole would have handled it too though).

    And of course, wildcards supported no problem.