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The MQ-135 Air Quality Sensor Module is a reliable gas detection sensor designed to monitor indoor air quality by detecting a wide range of harmful gases and pollutants. It is sensitive to gases such as ammonia (NH?), nitrogen oxides (NO?), benzene, smoke, alcohol vapors, carbon dioxide (CO?) (indirectly), and other volatile organic compounds (VOCs), making it suitable for environmental monitoring and air quality assessment.
The module provides both analog and digital outputs, allowing easy integration with Arduino, ESP32, ESP8266, Raspberry Pi, and other microcontroller platforms. It includes an onboard potentiometer for adjusting the digital output threshold and LED indicators for power and signal status, making it simple to configure for different applications.
The MQ-135 is widely used in smart home systems, IoT projects, industrial monitoring, and educational electronics where continuous air quality monitoring is required.
Key Features:
Detects a wide range of harmful gases and air pollutants
Analog and digital output signals
Adjustable sensitivity using the onboard potentiometer
Fast response and high sensitivity
Compatible with Arduino, ESP32, ESP8266, Raspberry Pi, and other microcontrollers
Built-in power and signal indicator LEDs
Easy to install and integrate into electronic projects
Durable and reliable for continuous monitoring
Applications:
Indoor air quality monitoring
Smart home and building automation
Environmental monitoring systems
IoT and embedded systems
Air pollution detection
Industrial safety and ventilation monitoring
Educational electronics and robotics
Research and prototype development