MQ2 Gas Sensor Detector Module


MQ-2 Smoke LPG Butane Hydrogen Gas Sensor Detector Module Smoke LPG Butane Hydrogen Gas Sensor Detector Module is useful for gas leakage detection (home and industry). It is suitable for detecting H2, LPG, CH4, CO, Alcohol, Smoke, or Propane. Due to its high sensitivity and fast response time, measurements can be taken as soon as possible. The sensitivity of the sensor can be adjusted by a potentiometer.

MQ-2 gas sensor using gas-sensitive material is to be clean air in the lower conductivity of Tin oxide (SnO2). When the sensor when flammable gases are present in the environment in which the sensor’s conductivity with increasing concentration of combustible gas in the air increases. Use a simple circuit to convert the changes in conductivity and output signal that corresponds to the concentration of the gas.

MQ-2 gas sensors’ have a higher sensitivity to liquefied petroleum gas, propane, hydrogen, and the detection of gas and other combustible vapors is ideal. This sensor can detect a variety of flammable gas, and is a low-cost sensor for many applications.


  • Preheat Duration 20 seconds
  • Can be Used to Measure or Detect LPG, Alcohol, Propane, Hydrogen, CO, and even methane
  • Can be used as a Digital or analog sensor
  • The Sensitivity of a Digital pin can be varied using the potentiometer


Pin NamePin Description
VccThis pin powers the module, typically the operating voltage is +5V
GroundUsed to connect the module to the system ground
Digital OutYou can also use this sensor to get digital output from this pin, by setting a threshold value using the potentiometer
Analog OutThis pin outputs 0-5V analog voltage based on the intensity of the gas 


Dimensions36 x 20 x 21 mm(LxWxH)
Weight8 gm
The operating Voltage+5V
Analog output voltage0V to 5V
Digital Output Voltage0V or 5V (TTL Logic)


  • Domestic gas leakage detector
  • Industrial Combustible gas detector
  • Portable gas detector


Download the Datasheet of the MQ2 Gas Sensor Detector Module from the link given below.