Speaking of failures, right now I only have one of those 0.66" displays, and I keep moving it from prototype to prototype, until at some point the ribbon cable will inevitably fail. So I ordered more of those tiny OLED displays. Except for some weird reason I thought they are 0.42" and not 0.66", so I got this:

Crazy how much difference 0.24" makes, eh?

Of course I can't use those displays on the badges, but they could be cool as eyes on a robot or something, so I designed a breakout for them. I can't use the SAO connector, since it's too big, but STEMMA QT sockets are about the right size.

I just managed to fit all the passives, and even squeezed in an address selection jumper, so you can have two of those on the same bus. It will be a while before the PCBs arrive, because I ordered them from OSHPark with the free shipping, and they are far away. But there is no hurry, and it's only about a dollar for three pieces.