What is an MQ135 Air Quality Sensor? An MQ135 air quality sensor is one type of MQ gas sensor used to detect, measure, and monitor a wide range of gases present in air like ammonia, …

Feb 27, 2018 · MQ135 is available as a module or as just the sensor alone. If you are trying to only detect (not measuring PPM) the presence of a gas, then you can buy it as a module since …

Structure and configuration of MQ-135 gas sensor is shown as Fig. 1 (Configuration A or B), sensor composed by micro AL2O3 ceramic tube, Tin Dioxide (SnO2) sensitive layer, …

MQ-135 gas sensor module features both analog output fetched from its AO pin and digital output fetched from its DO pin. The analog output voltage lies between 0-5V where the output voltage …

It is widely used in air quality monitoring systems, industrial applications, and safety systems to ensure a healthy and safe environment. The sensor provides an analog output that can be …

The MQ135 sensor's versatility allows it to be used for applications such as indoor air quality monitoring, gas leakage detection, and environmental sensing.

There are many reasons that may cause air pollution and affect the quality of the air. In many places, it is necessary to monitor air quality, such as in hospitals, and the rate of harmful gas …

Mar 13, 2024 · The MQ135 can detect and measure a wide range of gases around it and present the output in the form of digital or analogue values. In this article, we will commence by …

Learn how to interface the MQ-135 Gas Sensor with Arduino. This guide includes wiring diagrams, code examples, and practical tips for measuring air quality and gas levels.

Dec 10, 2025 · Learn how to connect MQ135 air quality sensor with Arduino. Step-by-step wiring, working principle, and Arduino code for beginners.