Decided to build my own custom RP2040 board to learn hardware design. The RP2040 is awesome for this because it has incredible documentation.

I started by blocking out the schematic into logical chunks. The power supply needs to deliver both 3.3V and 1.1V, so I used an MCP1700 regulator and stacked up a dense bank of 0.1uF and 1uF decoupling capacitors to keep the power rails stable. For storage, I connected a 128Mb flash chip. I also integrated a USB-C connector and wired up a standard 12MHz crystal oscillator circuit to handle the clocking.

Moving from the schematic to the layout sort of tricky but we got there.

Hopefully everything runs