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Detects a wide range of harmful gases including ammonia, benzene, sulphide, smoke, and other air pollutants
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Provides both analog (0–5V) and TTL digital output
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Comes with adjustable sensitivity via onboard potentiometer
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Ideal for air quality monitoring in homes, offices, and industrial environments
MQ-135 GAS Sensor
Original price was: ₹239.00.₹140.00Current price is: ₹140.00.
The MQ-135 Air Quality/Gas Detector Sensor Module is a reliable and affordable solution designed to monitor air quality and detect harmful gases in the environment. It is highly sensitive to ammonia (NH₃), sulphide (H₂S), benzene (C₆H₆) vapors, as well as smoke, alcohol, and other volatile organic compounds (VOCs).
The sensor operates on the principle of changing conductivity based on gas concentration. In clean air, the module shows low conductivity. As the concentration of target gases increases, the conductivity rises—this change is converted into both analog (0–5V) and digital (TTL) output signals, allowing easy integration with microcontrollers like Arduino, Raspberry Pi, and other embedded platforms.
Thanks to its fast response and recovery time, along with adjustable sensitivity, the MQ-135 is well-suited for real-time air quality monitoring in smart home systems, pollution detectors, and indoor ventilation control. Whether you’re building a custom air purifier or an automated gas detection alarm, this sensor provides the essential data needed for safe and smart decisions.
✅ Key Features:
- High sensitivity to Ammonia, Sulphide, and Benzene vapors
- Also detects smoke, alcohol, and other harmful gases
- Analog voltage output (0 – 5V): Higher gas concentration = higher output voltage
- TTL digital output: Low level signal when gas is detected
- Signal output indicator (LED)
- Fast response and recovery
- Adjustable sensitivity via onboard potentiometer
- Long lifespan and stable performance
- Operates on 5V DC, easy to interface with Arduino
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