Goal: create the Nim schematic on your NUCLEO-G031K8 with 12 LEDs (GPIO sink at 3.3 V) and 6 switches to GND (internal pull-ups).
Plan:
Add 12 LEDs + 12 series resistors, and 6 momentary switches.
Wire: LED anodes to 3V3; LED cathodes via resistors to D2–D13. Switches from A0–A5 to GND_1/GND_2.
Label by row/color; add notes for sink-drive and using internal pull-ups.
Run ERC and tidy designators.
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