An ongoing home lab build: a custom smart hub replacing an off-the-shelf smart home device that never quite did what I wanted. Built around an ESP32-S3-DevKitC-1-N16R8 (16MB flash, 8MB octal PSRAM) housed in the original enclosure, wired into Home Assistant over ESPHome. Sensors Air-quality package: SCD41 (photoacoustic NDIR for CO₂) with BMP280 pressure compensation, SHT45…