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Comment by drum55 | Hacker News Reader

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drum55·

The PCB looks super weird, what is going on here?

https://files.catbox.moe/nijoin.png

https://files.catbox.moe/suazr4.png

They sort of look sensible until you look closer and then the whole board is fever dream autorouting.

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they answered with AI and got flagged for being AI. You can turn on showdead in settings to see it but there's nothing of value in their comment really.

yeah it's raw output from the router i'm coding without a trace smoothing pass yet, so it draws ugly jagged steps. looks bad to a human layout engineer, no argument there. either way it won't stop it from working, the electrons don't care how ugly the bend is at 2 MHz. just want to see if it boots when the jlcpcb parcel lands.

edit: idk why my comments are being [flagged], i've written to hn but the issue is apparently still there

Probably because of some of them appear to be LLM-authored.

https://www.pangram.com/history/67234835-58ff-4603-ba17-2234...

It's not about your clock speed, it's about your edge rate. Anyone who's had to lower drive strength or slew rate can tell you that even at 0.0000...1 Hz clock speed, if your routing is trash it can ring to the point of detecting multiple edges or interfering with other signals.

Also some of the issues were on USB lines which hopefully aren't running at 2MHz.

Lastly, since you're coding it, maybe make it pull reference layouts+routing for power supplies from the datasheets. That's step 1 for any real eCAD student.

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