I’ll keep this minimal: inspect the Pico 2 shield pins, select a simple I2C humidity sensor, add only its required decoupling and I2C pull-ups, wire it to the Pico 2’s 3V3/GND/I2C pins, then run review and fix any schematic issues.

I selected the SHTC3: it runs directly from the Pico 2 3V3 rail and only needs a 100 nF local decoupling capacitor plus one pair of I2C pull-ups.

The added sensor circuit is wired correctly. Review is now only flagging unused Pico header pins, so I’m tying the remaining Pico ground pins to GND and marking intentionally unused header pins as no-connect for this minimal shield.

Done — I added a minimal SHTC3 humidity/temperature sensor circuit for the Pico 2 shield: U2, 100 nF decoupling, and 10 kΩ I2C pull-ups on GPIO0/GPIO1. Power/GND/I2C wiring is complete, unused Pico shield pins are intentionally marked no-connect, and the ERC checks now report no unresolved issues.

Next step is PCB layout/placement if you want to continue.