MQ-135 Sensor Air Quality Gas Detection Module for Arduino with Analog and Digital Output

This MQ-135 sensor checks the quality of the air around it and sends the reading to your Arduino or other microcontroller. It responds to gases like ammonia, benzene, alcohol, smoke, and CO2, so you can see when the air gets polluted or stuffy.

Where You Can Use an MQ-135 Sensor

It is a popular module for air quality monitors, indoor pollution alarms, smart ventilation projects, and science exhibits. The board gives both analog and digital output, so you can read the air quality level or simply get a yes or no signal. A small knob lets you set the sensitivity. The sensor needs a warm-up time after power-on to give stable readings. It is meant for hobby and learning projects, not for certified safety use.

Product Highlights

• Air quality gas detection module for ammonia, benzene, alcohol, smoke, and CO2
• Analog and digital output
• Adjustable sensitivity with an onboard knob
• Works with Arduino and other microcontrollers
• Good for air quality monitoring and ventilation projects