MQ-135 Air Quality Gas Sensor Module – CO₂, NH₃, Benzene, Smoke & Harmful Gas Detection

🌍 MQ-135 Air Quality Gas Sensor Module – CO₂, NH₃, Benzene, Smoke & Harmful Gas Detection

The MQ-135 Gas Sensor Module is a reliable and affordable solution for monitoring air quality and detecting toxic gases in the environment. It can detect a wide range of volatile organic compounds (VOCs) including ammonia (NH₃), carbon dioxide (CO₂), benzene, alcohol, smoke, and other harmful substances.

With both analog and digital output, this module is easy to integrate into Arduino, ESP32, Raspberry Pi, and other microcontroller-based systems. It is ideal for indoor air quality monitoring, smart ventilation systems, DIY environmental sensing, and early gas leak detection.

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✅ Key Features:

• 🧪 Sensing Gases: CO₂, NH₃, benzene, smoke, alcohol, VOCs, and more

• 🔌 Output:

  • Analog Output: Proportional to gas concentration

  • Digital Output: Adjustable threshold using onboard potentiometer

• ⚡ Operating Voltage: 5V DC

• 📏 Preheat Time: 20 seconds (stabilization may take a few minutes)

• 🔧 Adjustable Sensitivity: Potentiometer to set digital threshold level

• 📎 Interface: Standard 4-pin header (VCC, GND, DO, AO)

• 📦 Compact PCB: Easy to embed into smart systems and IoT projects

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🧰 Applications:

• Indoor air quality monitors

• Gas leak detectors

• Smart homes and air purifiers

• HVAC control systems

• Environmental data logging

• Industrial safety and monitoring

• DIY science and IoT projects

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🔗 Why Choose the MQ-135 Sensor?

The MQ-135 is a versatile and widely used sensor for monitoring air pollution and gas leaks. Its dual output makes it suitable for both threshold-based alarms and precise data analysis, depending on your project needs. Whether you’re building a home air quality monitor or a school science project, this sensor is a reliable choice.

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📦 Package Includes:

• 1 x MQ-135 Air Quality Gas Sensor Module

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🔍 Keywords:

MQ-135 gas sensor, air quality sensor Arduino, harmful gas detector, CO2 NH3 sensor, MQ135 module Pakistan, smoke detection sensor, Arduino air pollution sensor, indoor air quality module, MQ series gas sensor.