This DIY air-quality monitor avoids the usual sensor sprawl by using Sensirion's SEN66 module to measure VOCs. CO₂, NOx, particulate matter, temperature, and humidity in a single compact package.
Built around a XIAO ESP32-C3 and a small e-ink display, the system integrates with Home Assistant through ESPHome and presents readings using a simple emoji-based status interface. A notable aspect of the project is the custom ESPHome implementation for the SEN6x sensor family, all housed inside a compact 3D-printed enclosure
