Add the minimum required components needed for this Pi Pico 2 to function properly. Keep the design as simple and minimal as possible.
You may include a single humidity sensor as the primary peripheral, along with any essential supporting components such as power regulation, pull-up resistors, decoupling capacitors, or required connectors.
I’ll keep this minimal: inspect the Pico shield pins, choose a simple I2C humidity sensor, add only its required pull-ups/decoupling, then wire and run checks.
Done — I added the minimal Pico 2 humidity shield circuitry: SHT40 sensor, 10kΩ SDA/SCL pull-ups, 100nF sensor decoupling, and a simple 2-pin 5V/GND VBUS power header.
The schematic ERC is clean for the added circuit; remaining review errors are PCB airwires only, which are expected because the new components have not been placed/routed yet. I also recorded the design rationale in Minimal Pico 2 Humidity Shield Notes.