I made my castellated edge/holes by modifying a pin header (1.27 pitch).
Now I am wondering, if there is an existing pattern for board with castellated edges. Or is that simply something everybody is designing from scratch?
Most modules that use castellated pins have them on more than one edge.
Since every board is slightly different, there needs to be a footprint drawn to match.
That’s why there are footprints for specific modules, and not universal ones.
OK, I was to unspecific on that one. I also meant like partial things like the pads itself or rows of pads with the common pitch (2.54 or 1.27) since those are often very similar.
I did, perhaps not your specific post.
But this is not about the castellated holes/edges, but the pads/pattern a board with castellated edges is to be soldered on.
If you really want to do that, just copy a row of holes from an existing footprint and save it.
The problem is - the final footprint will require rows of pads of arbitrary length.
Maybe better to save a single pad, and just repeat it as necessary.
That wasn’t clear at all from your post.
There exist popular modules with castellation and they have datasheets and also may have ready made footprints. For example, search for “esp” in KiCad footprint libraries. Compare some of those footprints with the corresponding modules. It’s not too difficult and exact dimensions are hardly critical. Just basic (rounded) rectangle pads. As an example ESP32-WROOM-32 has a KiCad footprint where the Description field has a link to the datasheet which shows the module’s own pad dimensions and the recommended land pattern for the board where it will be soldered to.
@eelik
That wasn’t clear at all from your post.
I see now why, my apologies. And thanks for the explanations. And you are quite right: It is not difficult at all, just the pad and the right grid for it and you quite easy “click together” the footprint, as the editor assumes the same size of pad after the first step.