• Looks great!

    Just some ideas:

    • those holes under the Pico will make it very difficult to solder a castellated Pico right onto the board - I guess you could just stick some tape under it to insulate it though?
    • is there a cut-out in the board to allow a Type A USB socket to slide over the Pico? Looks like you've stopped the ground line there but the actual PCB outline goes straight on. Again, not an issue if you're mounting the Pico on pins, but if you want to solder it straight down it'd be a pain (and soldering it straight down is really handy).
    • I don't know if you care, but you could swap all your square vias to be round with the 'Change' tool.
    • I'm not sure where you'd put them, but what about mounting holes? A lot of people complained about that with Espruino, and I can see that you might want to screw it into a box
    • Finally, I don't know whether there are 'standard' box sizes, but if there are, you might be able to tweak the PCB size slightly so it'll easily fit into a project box?

    Looks like I'll probably start some kind of online shop for the adaptor shims, so I'd be very happy to sell this with some kind of referral?

    About the 45 degree angles - I still think it's a non-issue for normal GPIO lines (I imagine it helps stuff like clock lines). But yes, it won't stop people complaining whenever they see one :) I still want a PCB design tool that'll do routing with nice curved lines that automatically bend around vias and things.

  • Looking very good!

    @Gordon "I still want a PCB design tool that'll do routing with nice curved lines that automatically bend around vias and things." Altium does this. You can either drag and it will place tracks according to rules where it can find path. You can also enable push tracks which will push tracks. Then push vias which will also push vias, lastly a god mode push which will replace everything to let your track through. It's powerful for tight routing!

    https://youtu.be/VhPk3J1WcpE?t=4m11s
    see it in action here (this guy uses 45* but you can change rules to use rounded (also min/pref/max radius). :)
    EDIT: The link points to 4m11s [this is where you'll see via push] but it does not start from there here. Some bug with the autoembed I assume. (One more thing I'll fix if you make a branch of this forum :) )

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