So this project has suffered even more mission creep than it originally had, and that's saying something. But it should be ready for production soon.
Now sports two 24 line IO expanders and tons of extra stuff. Same form factor and same MCU.
Progress has been made. Not finished, but definitely closer.
Should I route 5V and 3V3 over to the breadboard, or should I do Vbatt and 3V3 instead? I've got both 5V and 3V3 buck/boost converters available.
What about an adjustable one? It'd only add like $2 to the price.