Gas Sensor MQ2 Sensitive Smoke & Flammable Gases


MQ2 is a semiconductor sensor which can detect smoke and flammable gases at concentrations from 300 to 10,000 ppm. The sensitive material used for this sensor is SnO2, whose conductivity is lower in clean air.

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It’s conductivity increases as the concentration of combustible gases increases. This sensor has high sensitivity to Hydrogen, Propane, LPG, Methane and other combustible steams. This can be used to detect gas leakage in industries and houses. MQ2 gas sensor can be easily interfaced with Microcontrollers, Arduino Boards, Raspberry Pi. You may also use a comparator to convert analog output to digital and a preset can be used along with it to adjust sensitivity.


Domestic gas leakage detector
Industrial combustible gas detector
Portable gas detector


Wide detecting scope
Stable and long life
High sensitivity
Fast response
Low cost
Long Life
Simple drive circuit
Fast response and High sensitivity
Analog and Digital Outputs
Trigger Level configuration Potentiometer


Sensor Type : Semiconductor
Standard Encapsulation : Black Bakelite
Detection Gas : Combustible Gas and Smoke
Concentration : 300 – 10000ppm
Circuit Voltage : 5V ±0.1 AC or DC
Heating Voltage : 5V ±0.1 AC or DC
Load Resistance : Adjustable depending on sensitivity
Heater Resistance : 33Ω ±5% at room temperature
Heating Consumption : < 800mW

Operating Voltage: DC 5V
Analog Output (AO): 0~5V analog output voltage
Digital Outout (DO): 0V or 5V output
Configuration: Through Potentiometer (adjusts the output level transition)
Preheat Duration: 20s
Weight: 5g
Dimensions: 23 x 19 x 19 mm


VCC (+5V)
GND (0V)
DO (Digital Out)
AO (Analog Out)