Name: MQ135 Air Quality Sensor Module
Brand: Oxymora
SKU: OM0045
Availability: InStock

MQ135 Air Quality Sensor Module

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The MQ135 Air Quality Sensor Module detects a wide range of harmful gases in the air, including ammonia (NH₃), sulfur oxides, benzene, CO₂, smoke, and other volatile organic compounds (VOCs). It provides both analog and digital outputs for real-time air quality monitoring in environmental and indoor safety applications.

SKU: OM0045

Brand: Oxymora

Product details

The MQ135 Air Quality Sensor Module uses a semiconductor gas-sensitive material (SnO₂) that changes conductivity based on the concentration of harmful gases in the air. As pollutant levels increase, the resistance of the sensor decreases, resulting in a varying analog voltage output proportional to air contamination.

The module also integrates a comparator circuit with an adjustable potentiometer, enabling threshold-based triggers through a digital output signal. It includes LED indicators for power and gas alert notifications.

The MQ135 is suitable for indoor air quality systems, smart ventilation devices, gas leak alerts, and environmental monitoring projects. It is compatible with microcontrollers such as Arduino, ESP32, ESP8266, STM, and Raspberry Pi.

Specifications

Sensor TypeMQ135 Air Quality / Gas Sensor
Gases DetectedNH₃, Benzene, CO₂, CO, Alcohol, Smoke, VOCs & other pollutants
Operating Voltage 5V DC
Output TypeAnalog AO & Digital DO
Detection RangeWide detection range for various gases (ppm level)
Preheat Time≈ 20 seconds initial heating, optimal performance after warm-up
SensitivityHigh sensitivity to a wide variety of pollutants
Sensitivity AdjustmentOnboard potentiometer
Indicator LEDsPower LED & Digital Alarm LED
ApplicationsAir quality monitoring, pollution meters, gas leakage alarms, smart ventilation, HVAC control, indoor environmental safety