No guarantees, but I’m pretty certain it’s not. It shows as “PCB Outline” on hover-tips and layers and stuff. I’ve removed it anyway for clarity
The green trace all around the outside is GND, but that’s really just because PCBnew needs the pads connected to put them in the correct zones, in reality they’re just part of the filled ground-plane area.
I suppose the a lot of the routing thing is a bit about personal opinions too, for example once I start putting things on the top layer, I go nuts and put loads on there Or I decide that top-layer stuff should be as little and short as possible, and it all changes again.
I imagine that for a while to come I will be using single-side boards, so all the top-layer stuff is going to be jumpers, so the “keep them short and straight” theory will prevail.
Here’s a new version of the fully two-layer approach though
Not sure how important the size of the heatsink area is, but I made H1’s Pin 15 go the longer way around to maximise the under-chip area.
If I’m using a ground-plane on both sides, what is the deal with vias? I assume I don’t want to perforate my board with loads of 'em.
Also, I assume it’s okay to go straight to a pin on the top layer? Daft question perhaps, but I’ve only ever used single-sided home-etched boards before, and that was 15+ years ago!
There’s a fair bit more room now too, so I could in theory move all the connectors in a good bit. Won’t bother for this example, as it’s a bit of a contrived layout anyway, until I sort out the connectors and final circuitry I’ll be needing. My robot needs some cute arms to wave about, or ears to wiggle, or something*
Thanks for the help!
(*although at the moment it’s a wheeled robot on a HDD chassis, so ‘cute’ might take a bit of imagination)