MQ 2 font b Arduino b font gas sensor smoke methane detection analog sensor
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MQ 2 Arduino gas sensor smoke methane detection analog sensor

MQ-2 Arduino gas sensor smoke methane detection analog sensor

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Today, the awareness of social environmental awareness of the masses, the majority of people who do environmental protection for the majority of the pursuit of life today, the demand is growing, so the development of green products have become the pursuit of the major companies. Aosong robot launched MQ-X series of gas sensor is adapted to the market demand and design, the smoke sensor uses mq-2 type gas sensor, detection can be very sensitive to air.Smoke and methane gas. adoptCan be directly inserted into theOn throughProgramming convenient to use, combined withand, can be produced smoke alarm, methane leakage alarm, automatic smoke exhaust fan and other products, is to make the indoor air to achieve environmental standards of the ideal sensor.

This module is still used in comparison with the old versionShen Jin process and 4 positioning hole design style, so that the module to ensure the function under the premise, making enough exquisite beauty and data interface module by the original ordinary gill changed toAnti plug and anti 3P interface, to avoid the misuse of non professionals. This module is also the sameUseThe new version of the new version will be the name of the sensor as well as the English label on the PCB.MQ-2Gas sensors are more humane than the old version, in the interface on both sides of the two logo, logo “ A” representative moduleAnalog sensorInterface S” “ on behalf of the input or output asdigital signalOn the other, a logo with graphic convey module function, convenient for non professionals to quickly understand the function module.

The household can be used as a gas leak alarm, and the industry can be used as a combustible gas alarm, which is a portable gas detector.

This sensor is equipped with adjustable sensitivity potentiometer, easy to use

The interface adopts anti anti plug pin, to prevent misuse of non professional personnel

MQ-2 gasThe size of the sensor is small in size and easy to use.

1 Product Name: MQ-2 gas smoke sensor 2 product number: RB-02S015A 3 input voltage: 5V 4 working voltage: 5V 5 heating voltage: 5V+/-0.2V (AC or DC) 6 load resistance: 5K (adjustable) 7 circuit voltage: less than or equal to 24V 8 response time: greater than or equal to 10s 9 recovery time: less than or equal to 30s 10 component power consumption: less than or equal to 7W 11 data type: analog output 12 dimensions: x 25mm 40mm 13 weight: 7g 14 definition: S: signal interface +: power cathode – power supply

This sensor is equipped with sensitivity adjustment potentiometer: clockwise counterclockwise regulation, regulation. Such as adjusting the sensitivity of the smoke sensor, can be satisfied with the smoke concentration fan start point.

Parameters of MQ 2 gas sensor:

A. standard working conditions


Parameter name

technical conditions



Loop voltage


AC or DC


Heating voltage

5.0V±0.2 V

AC or DC


Load resistance



Heating resistance


room temperature


Heating power consumption


B. environmental conditions


Parameter name

technical conditions



Use temperature

-10 C -50 C


Storage temperature

-20 C -70 C


relative humidity

Less than 95%RH


Oxygen concentration

21% (standard conditions)

Oxygen concentration affects sensitivity characteristics

The minimum value is greater than 2%

C. sensitivity characteristic


Parameter name

Technical parameter



Sensitive surface resistance


(1000ppm iso butyl)

Detecting concentration range


Liquefied petroleum gas and propane


5000ppm-20000ppm methane

300ppm-5000ppm hydrogen

100ppm-2000ppm alcohol


Iso butyl

Concentration slope


Standard working conditions

Temperature: 20 C ± 2; 0.1V; Vc:5.0V±

Relative humidity: 65%± 5% 5.0V± 0.1V; Vh:

Preheating time

No more than 1 hours

In a wide range of concentration of combustible gas has a good sensitivity, the sensitivity of liquefied petroleum gas, propane, hydrogen is higher, with long life, low cost, simple circuit and so on.

S port connected to the controller’s A0 port, 5V and GND respectively received the power of +5V and GND

Gas detection of common lighter

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Price:  US $4.85 / piece
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