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interfecoon Show HN: An app that logs your meal's calories from a photo

looks like even the apple logo in the appstore button is vibecoded.

interfecoon Apple's hostile App Store rating system

This might be bit unfair.

App developers, can signal the OS when they believe is the right time to ask for a review, but it is the OS that decides to show the prompt. The app developer has no idea about your OS preferences and I don't think they deserve a 1 star review just because the OS failed to honor your stated preference.

interfecoon I learned PCB design, 3D printing and C just to listen to music

Yes, this was it, looks like it is gone now. According to the CM3 datasheet [0] "Radxa CM3 will remain in production until at least Sep 2029", so there should be inventory hopefully.

[0]: https://dl.radxa.com/cm3/docs/radxa_cm3_datasheet.pdf

interfecoon I learned PCB design, 3D printing and C just to listen to music

I buy them on AliExpress.

interfecoon I learned PCB design, 3D printing and C just to listen to music

Just to be clear, I made a working prototype (and put a hyperbole in the title), I have a lot to learn still.

You can learn something practical like "embedded DisplayPort should be impedance controlled to 100 Ohms" without fully understanding the physics behind it.

AI can be very convincing. It told me to put the ESD protection as close the Ethernet connector as possible, so I put it between the port and the magnetics. This worked, but resulted in around 1% packet loss. When I moved it after the magnetics, I got 0% packet loss. This cost me a full revision, but I'd say this is the price to pay for not learning everything by the book.

interfecoon I learned PCB design, 3D printing and C just to listen to music

I am not using pipewire, just ALSA. AirPlay is (almost) always 44,100 Hz so there is not much to auto-switch to.

interfecoon I learned PCB design, 3D printing and C just to listen to music

Mostly YouTube and udemy courses. This one was pretty good in particular: https://www.udemy.com/course/high-speed-pcb-design-with-kica...

I've spend around a month on the PCB as a hobby, next to a full time job.

interfecoon I learned PCB design, 3D printing and C just to listen to music

Easier than it sounds: the app runs a simple http server that serves cover art by track id. The track id is transferred via iOS's built in "Now Playing" metadata fields, which is then used by the device to construct a query and fetch the full resolution image.

interfecoon I learned PCB design, 3D printing and C just to listen to music

Hey HN,

I've finally finished my dream music streamer featuring a vinyl-sleeve-sized square display, a custom carrier PCB for a compute module and a 3D printed case, running a custom-compiled kernel, Alpine mini rootfs and a small C app driving the display.

I did not think that this was doable by a hobbyist at all, let alone using free/open source software only (KiCAD, FreeCAD, VSCode). Turns out I was wrong!

interfecoon Ask HN: What Are You Working On? (July 2026)

My passion project is an LP-sleeve-sized music streamer built around an ARM compute module, a custom PCB carrier board and an industrial 17" square display.

https://pentaton.app/blog/2026-07-12-introducing-pentaton-lp...