CedHon

Very interesting, would you share what you like in this tool ?Have you tried circuits.io or upverter ?

Nice idea!The AtTiny programming procedure is very well explained here:http://highlowtech.org/?p=1695I hope it helps ;)

Haha, I miss colors, good point, thanks for sharing !

I also thought it could be hard (wasteful) on the etching solution but apparently no, it's reusable a lot of times ;)Now this particular design was absolutely not optimal, it was a really quick intro do PCB so there are a lot of things that could have been better.Thanks for the questions !

Haha, yes, I meant a bubble bath with an aerator ;) About the AtTiny sockets, it was done on the 1st boards, then to save some we just soldered them directly, but if you look at the pics in the step 4, you'll see how we used a socket as "in system programmer". It's not perfect but the white tack white tack makes it pretty stable actually ! Thanks for your comments ;)

Thanks!You can make PCB with CNC mill, otherwise, OSH park or seeed studio might be interesting solutions.

In this case, the idea was to let everyone participate in real time so we used an online PCB design tool (circuits.io and upverter.com allow this).

Thanks !The programming step explains it now:https://www.instructables.com/Collaborative-PCB-Intro/step4/ProgrammingFeel free to ask if you need any other detail :)