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MQ-135 Gas Sensor
SKU: ARD-0131-L01
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Short Description
The MQ-135 Gas Sensor Module is a semiconductor gas sensing module that can detect a variety of gases and air quality issues.
It is often used in projects involving air quality monitoring and gas detection with Arduino and other microcontroller platforms.
The sensor's resistance varies with the concentration of gases present, providing an analogue signal that can be detected by a microcontroller.
Many module variants contain an LM393 comparator with a programmable threshold and digital output.
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Specifications:
Product Type: Gas Sensor Module.
Sensor Type: Semiconductor / Metal Oxide Gas Sensor.
Primary Use: Air Quality and Gas Detection.
Detectable Gases: Ammonia (NH₃), nitrogen oxides (NOx), smoke, benzene, alcohol vapours, carbon dioxide (CO₂) and other combustible/toxic gases.
Operating Voltage: 5 V DC.
Sensor Heater Voltage: 5 V DC.
Output Type: Analog and Digital*.
Analog Output: AO.
Digital Output: DO*.
Sensitivity Adjustment: Onboard potentiometer*.
Comparator: LM393*.
Interface: VCC / GND / AO / DO*.
Number of Pins: 4*.
Sensor Resistance: Changes according to gas concentration.
Preheating Time: Recommended extended preheating for stable measurements; 24 hours for best sensor stability.
Compatible Platforms: Arduino, ESP32, ESP8266, Raspberry Pi, STM32 and other microcontroller platforms.
Applications: Air-quality monitoring, pollution detection, gas leakage indication, environmental monitoring, Arduino projects, IoT and DIY electronics.