MQ-135 is a type of gas sensor commonly used for detecting a range of air quality parameters. Specifically, it can sense gases like ammonia (NH₃), nitrogen oxides (NOx), alcohol, benzene, smoke, and carbon dioxide (CO₂), among others. It’s often used in air quality monitoring devices, home air purifiers, and environmental monitoring systems.
Wide detecting scope
Fast response and High sensitivity
Stable and long life
Operating Voltage is +5V
Detect/Measure NH3, NOx, alcohol, Benzene, smoke, CO2, etc.
Analog output voltage: 0V to 5V
Digital output voltage: 0V or 5V (TTL Logic)
Preheat duration 20 seconds
Can be used as a Digital or analog sensor
The Sensitivity of Digital pin can be varied using the potentiometer