We’ve updated the project description with a clear, detailed summary of your smart sensor node goals and created and stored a Mermaid system-architecture diagram. All major ICs (the WiFi/BLE MCU, 3.3 V LDO, humidity/temperature sensor) plus a GND portal and ESD protection diodes have been added. We reviewed the power subsystem and added a reverse-polarity Schottky diode, selected decoupling capacitors for the LDO and sensor, I²C pull-ups, USB-C CC pull-downs, and power-filter inductors. We added the USB-C UFP connector and MCU programming header, then made all net connections (VBUS→diode→LDO VIN, grounds, LDO VOUT→VDD/pull-ups/LED, CC resistors, I²C SDA/SCL, LED cathode). ERC was run and schematic components, resistor ratings, decouplers, pull-ups, and MPNs were updated to clear violations. For the PCB we verified footprints, chose generic passive packages, selected a standard 4-layer stackup, defined the board shape and dimensions, added mounting holes, reserved the antenna edge keepout, paused for your review, classified nets by type, and confirmed part availability with MPN assignments.