Electronic Brick - Gas Sensor MQ135 CO2, à l'alcool, au Benzène, à l'oxyde d'azote NOx et à l'ammoniac NH3
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  • Electronic Brick - Gas Sensor MQ135 CO2, à l'alcool, au Benzène, à l'oxyde d'azote NOx et à l'ammoniac NH3
  • Electronic Brick - Gas Sensor MQ135 CO2, à l'alcool, au Benzène, à l'oxyde d'azote NOx et à l'ammoniac NH3

Electronic Brick - Gas Sensor MQ135 CO2, à l'alcool, au Benzène, à l'oxyde d'azote NOx et à l'ammoniac NH3

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MQ-135 Gas Sensor

CO2, à l'alcool, au Benzène, à l'oxyde d'azote NOx et à l'ammoniac NH3

The gas sensitive material used by the MQ135 gas sensor is tin oxide (SnO2), which has low conductivity in clean air. When the sensor is kept in the polluting gases, the conductivity of the sensor increases with the increase in the concentration of the polluted air. Using a simple circuit can convert the change in conductivity into an output signal corresponding to the gas concentration.
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  • What is MQ-135 and how does it work?
  • Pin Configuration.
  • Required Components.
  • Wiring Connections.
  • Testing the Circuit.
  • Code for Arduino.

Page Contents

  • 1 What is MQ-135 gas sensor and how does it work?
  • 2 Pin Configuration MQ-135 gas sensor
  • 3 Specifications of MQ-135 gas sensor
  • 4 Code for interfacing of MQ-135 gas sensor with Arduino

What is MQ-135 gas sensor and how does it work?

The gas sensor module consists of a steel exoskeleton under which a sensing element is housed. This sensing element is subjected to current through connecting leads. This current is known as heating current through it, the gases coming close to the sensing element get ionized and are absorbed by the sensing element. This changes the resistance of the sensing element which alters the value of the current going out of it.

Configuration MQ-135 gas sensor

From left to right first pins are as follows:

A0        Analog output

D0        Digital output

GND     Ground

Vcc      Supply (5V)

Specifications of MQ-135 gas sensor

  • Wide detecting scope
  • Fast response and High sensitivity
  • Stable and long life Simple drive circuit
  • Used in air quality control equipment for buildings/offices, is suitable for detecting
    of NH3, NOx, alcohol, Benzene, smoke, CO2, etc.
  • Size: 35mm x 22mm x 23mm (length x width x height)
  • Working voltage: DC 5 V
  • Signal output instruction.
  • Dual signal output (analog output, and high/low digital output)
  • 0 ~ 4.2V analog output voltage, the higher the concentration the higher the voltage.

ELECMQ135
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