Description
The MQ-135 Air Quality Sensor is a versatile gas detection module capable of sensing a wide range of harmful gases and pollutants in the air. It is commonly used in air purifiers, environmental monitoring systems, and smart home air-quality projects.
The module provides both analog and digital outputs and includes an onboard potentiometer for adjusting sensitivity. It can easily interface with Arduino, ESP32, and Raspberry Pi (with ADC). Its fast response time and high sensitivity make it highly effective for real-time air-quality applications.
Key Features
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Detects multiple harmful gases (NH₃, NOₓ, alcohol, benzene, smoke, CO₂)
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High sensitivity and fast response
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Analog and digital output modes
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Adjustable sensitivity via potentiometer
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Built-in LED indicator for digital threshold alerts
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Long life and stable operation
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Compatible with Arduino, ESP32, Raspberry Pi
Specifications
| Feature | Details |
|---|---|
| Operating Voltage | 5V DC |
| Detection Range | 10–1000 ppm (various gases) |
| Output | Analog voltage, Digital HIGH/LOW |
| Preheat Time | 24–48 hours (initial use) |
| Current Consumption | ≤150 mA |
| Sensitivity Gases | NH₃, NOₓ, CO₂, Benzene, Alcohol, Smoke |
| Operating Temperature | -10°C to 50°C |
| Dimensions | 32 × 20 × 22 mm |
Applications
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Indoor air-quality monitoring
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Air purifiers and ventilation systems
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Smart home environment sensing
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Industrial pollution monitoring
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IoT-based air quality projects
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Smoke and harmful gas detection
Compatible Boards / Circuits
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Arduino (Uno, Nano, Mega)
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ESP32 / ESP8266
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Raspberry Pi (via ADC such as ADS1115)
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Air quality displays, alarms, and IoT dashboards
Reviews
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