Windy is a fully open-source smart air quality monitor: from the PCB schematics to the 3D-printed enclosure to the mobile app, everything is in the repository and ready to reproduce.
The device pairs an ESP32 microcontroller with a CJMCU-811 sensor to measure CO2 and TVOC levels, powered by a lithium battery. The custom PCB was designed in KiCad and can be manufactured through any standard service. The enclosure is 3D-printable from the included STL files, designed by Daniel Maroni for durability and a clean form factor.
On the software side, a Flutter companion app (iOS and Android) handles pairing, real-time readings, historical trend visualization, and air quality recommendations. Users can trigger measurements on demand via the app or by pressing the physical button on the device.
The project was developed as a team effort during the course of Prof. Emanuele Panizzi at Sapienza, and is released under the MIT license.