MQ-135 Air Quality Sensor Module (Air Pollution Gas Sensor)

The MQ-135 Air Quality Sensor Module is a semiconductor gas sensor designed to monitor indoor air quality by detecting a variety of harmful gases. It is sensitive to ammonia (NH3), nitrogen oxides (NOx), benzene, smoke, carbon dioxide (CO2), and other volatile gases. The module provides both analog and digital outputs, making it easy to interface with Arduino, ESP32, STM32, Raspberry Pi, and other embedded platforms. It features an onboard LM393 comparator with adjustable sensitivity for environmental monitoring and air quality applications.

Key Features -

• Air quality monitoring sensor

• Sensitive to ammonia, nitrogen oxides, benzene, smoke and carbon dioxide

• Dual analog and digital outputs

• Adjustable sensitivity via onboard potentiometer

• Onboard LM393 comparator

• Fast response and recovery time

• Power and status LED indicators

• Easy microcontroller interfacing

• Stable and reliable performance

• Suitable for indoor air quality monitoring

Specifications -

• Product type - Air Quality Sensor Module

• Sensor type - Semiconductor Gas Sensor

• Target gases - NH3, NOx, Benzene, Smoke and CO2

• Operating voltage - 5V DC

• Output type - Analog and Digital

• Comparator IC - LM393

• Sensitivity adjustment - Onboard Potentiometer

• Preheat time - Required for Accurate Readings

• Working current - Moderate Due to Internal Heater

• Board type - Air Quality Sensor Module

Applications -

• Indoor air quality monitoring

• Environmental monitoring

• Air pollution detection

• Smart home automation

• Industrial safety systems

• Arduino and IoT projects

• Laboratory experiments

• Embedded electronics