I started making the schematic by referring to the RP2040 Hardware design docs, as well as the docs for the Radio Module 2 and some of the other stuff I used. Most of this time was spent back and forth reading docs, picking ICs and figuring it out. I guess at one point, that’s just how all PCBs work huh.

The RP2040 is pretty standard stuff, give it 3.3V, a decent QSPI flash chip and decoupling and it works like a charm. The Radio Module 2 was a bit interesting, but I just ended up following what the docs did word for word, wireless is something I really don’t wanna fuck around and find out :/

The Buck/Boost is fun! I put in a TI TPS63001, which gives a nice 3v3 voltage with minimal stuff! I added 2 diodes to prevent backfeeding into USB or the battery, and installed a TP4056 in conjunction with everything else.