Air Purifier using Arduino

An Arduino-based air purifier is a smart and cost-effective way to monitor and improve indoor air quality. This project involves using sensors to detect dust and gas levels in the air and automatically activating a filtration system when pollutants exceed safe limits. It is ideal for home or office use, especially in areas with high pollution or allergens.

Components Required:

• Arduino Uno

• Dust Sensor (e.g., GP2Y1010AU0F)

• Gas Sensor (e.g., MQ-135 or MQ-2)

• 12V DC fan

• HEPA or carbon air filter

• Relay module

• LCD display (I2C or 16×2)

• LED indicators (optional)

• Power supply

Working Principle:

The system continuously monitors air quality using the dust and gas sensors. The dust sensor detects airborne particles like PM2.5 and PM10, while the gas sensor identifies harmful gases like ammonia, carbon monoxide, and smoke. When the Arduino detects poor air quality—based on predefined thresholds—it activates the fan using a relay module. The fan pulls air through a HEPA or carbon filter, removing harmful particles before circulating clean air back into the room.

An LCD screen displays real-time readings from the sensors, while LED indicators can provide a quick visual cue about air quality levels (green for good, yellow for moderate, red for poor).

Applications:

• Home air purification

• Smart home integration

• Educational and DIY projects

• Pollution monitoring systems

Benefits:

This project helps raise awareness of indoor air quality and provides a functional way to reduce exposure to pollutants. It’s affordable, customizable, and a great learning experience for those interested in Arduino, sensors, and environmental health.

By combining simple electronics and coding, you can build a practical device that contributes to a healthier living environment.