MQ-135 is a sensor that measures air quality by detecting gases such as smoke, CO2, NH3, alcohol vapor and benzene in the environment. It may be insufficient in industrial applications, but it is suitable for use in places such as home and office.
The sensor is mounted on a card and turned into a module in order to facilitate use. It is powered by 5V. Both digital and analog outputs can be received from the sensor. Thus, both the presence or absence of gas and the density of the gas can be determined. Sensitivity can be adjusted with the pot located behind the module.
Arduino,
Raspberry Pi or other microcontrollers. When you want to use it with Raspberry Pi, if you want to use the analog pin, you need to use a converter such as Mcp3008.
Card dimensions: 32 x 20 x 22mm
Arduino and Raspberry Pi Sample Connection Diagrams of MQ Sensors:
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