Devlog #3
I went back into the schematic after realizing I was only using 3 of the 16 switches from the kit. Expanded the design to 8 switches wired in a proper 4x2 diode matrix, added one of the rotary encoders, and wired in the 0.91” OLED screen. I spent most of the session debugging the Electrical Rules Checker, which kept flagging power pin errors I didn’t understand at first. I think it’s because I had multiple 3V3 symbols that weren’t actually connected to each other since power symbols only merge nets if they’re physically wired together, not just because they share a name. Fixed that by adding a PWR_FLAG.

Challenges:
Understanding how diodes and rotary encoders work helped me implement new ideas into my hackpad.

Next Steps:
Get the XIAO footprint sorted with the correct library, then finish assigning footprints to the diodes, header, and encoder. After that I can finally generate the PCB layout from the schematic and start routing traces for the full 8-switch matrix instead of just the 3 I had before.