westfw:
Wow - A lot changed since the first time I looked at this! There was less to clean up, too.
yehyeh, it's quite common that i'll do one layout then learn from that, chuck the lot and do it again, better.
Updated versions in [/url]https://drive.google.com/drive/u/0/folders/0B6dMB5dovDUZYzhjY2M1NmEtZmI2NC00MDZkLTliODMtOWYzNjQyZmViNWEy[/url]
whoops, schematic's there, but the brd file is a zero-length file!
A couple design comments:
- Using an SMT reset switch might be advantageous, and cheaper to assemble.
- Does your micro-SD socket allow traces underneath the socket? Some don't...
hm good idea on the reset switch, i'll look one up. i'll not make any changes yet though, don't want to lose sync with what you've done. sd: yeah it does, it's a very common cheap chinese one that has plastic underneath not metal. i still put a ton of VIAs under it, even though it will only be running at SPI speeds.
review comments look good... i'll be able to respond to when the brd file isn't zero-length any more... 
I'd say ditch the Arduino "dog ear styling" and go with plain rounded corners, like we did for "Freeduino", but that's just me being style-less
Me and Mr Eagle CAD are not Best Mates, i would have to learn how to do that and also get over the "workman blaming the tools" syndrome... i know how it's done in PADS: select two edges, right-mouse, select "stretch arc". easy.... sigh...