Next Builder
The air we breathe indoors can often contain dust, pollutants, allergens, and microscopic particles that go unnoticed but can affect our health over time. While commercial air purifiers are becoming increasingly common, they are often expensive, difficult to customize, and provide little insight into the quality of the air around us.
To address this, I created AirSense—a smart DIY air purifier that combines air purification, environmental monitoring, and cloud connectivity into a single intelligent system. Rather than simply filtering air, AirSense continuously measures indoor air quality and provides real-time information about the environment, helping users better understand and improve the air they breathe.
Built around the Waveshare ESP32-S3, the system monitors PM2.5 dust concentration, Air Quality Index (AQI), temperature, humidity, atmospheric pressure, and indoor air quality using dedicated environmental sensors. All collected data is displayed locally on a front-mounted LCD dashboard and can also be accessed remotely through Arduino IoT Cloud, allowing users to monitor their environment and control the purifier from anywhere using a smartphone.
At the core of AirSense is a Xiaomi Air Purifier 4 Lite HEPA filter, capable of capturing up to 99.97% of airborne particles as small as 0.3 μm, including dust, pollen, smoke particles, and other common airborne contaminants. Combined with a powerful 150 mm exhaust fan, the system continuously pulls air through the 360° cylindrical filter, helping deliver cleaner and healthier air while providing complete visibility into the surrounding environment.
To give the project a professional product-like appearance, I designed the entire enclosure in Autodesk Fusion 360. The system integrates the HEPA filter, fan, sensors, display, and electronics into a compact custom housing that balances functionality, aesthetics, and ease of assembly.
AirSense is more than a DIY project—it is an example of how makers can build intelligent products that solve real-world problems and make technology accessible to everyone.
AirSense transforms ordinary air purification into an intelligent, connected experience—helping people breathe cleaner, healthier air every day.
Smart Hut
j
David Thomas
Mohamed Lanjri