MQ-135 Air Quality Gas Detector Sensor Module
The MQ-135 Air Quality and Hazardous Gas Detection Sensor Module is a highly versatile environmental monitoring solution engineered for tracking atmospheric pollutants. Driven by a rugged Tin Dioxide (SnO2) semiconductor surface layer, this module boasts exceptional sensitivity to Ammonia (NH3), Nitrogen Oxides (NOx), Alcohol, Benzene, Smoke, and Carbon Dioxide (CO2). The onboard breakout carrier electronics feature a versatile dual-signal layout: a 0-5V Analog Output (AO) for continuous real-time air quality indexing and a TTL Digital Output (DO) managed by an LM393 voltage comparator with an adjustable threshold potentiometer for immediate binary ventilation or alarm triggers. Operating on a standard 5V power supply, it is the definitive hardware pick for smart home air purifiers, industrial pollution tracking nodes, smart city environmental grids, and DIY weather stations using Arduino, ESP32, or Raspberry Pi
₹ 112
₹ 149
| : | |
| Made In : | India |
The MQ135 Air Quality Sensor Module is a versatile gas detection sensor designed to monitor indoor air quality. It can detect a wide range of harmful gases such as CO₂, ammonia, benzene, alcohol, and smoke. With both analog and digital outputs, this module is ideal for environmental monitoring systems, smart home applications, and IoT-based air quality projects.
Key Features
- Detects CO₂, ammonia (NH₃), benzene, smoke, and other harmful gases
- Dual output: Analog (A0) and Digital (D0)
- Adjustable sensitivity via onboard potentiometer
- Fast response and high sensitivity
- Onboard comparator (LM393) for digital output
- LED indicators for power and gas detection
- Easy integration with Arduino, ESP32, Raspberry Pi
Technical Specifications
| Parameter | Specification |
|---|---|
| Sensor Type | MQ135 Gas Sensor |
| Detectable Gases | CO₂, NH₃, Benzene, Smoke, Alcohol |
| Operating Voltage | 5V DC |
| Output Type | Analog + Digital |
| Preheat Time | ~20 seconds (recommended longer for stability) |
| Sensitivity | Adjustable |
| Interface | 4-pin (VCC, GND, A0, D0) |
| Comparator IC | LM393 |
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