MQ2 is a low cost 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. 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 Smoke and Gas sensor can easily be interfaced with Microcontrollers, Arduino Boards, Raspberry Pi etc.

Features

• Working Voltage : 5V
• Has wide range sensitivity to combustible gas with high sensitivity to LPG, Propane and Hydrogen
• Has a potentiometer to adjust the sensitivity of the module
• High reliability and long life
• Has fast response and recovery
• Has dual signal output ie. Analogue and TTL level output
• Detecting range of 300 to 10000ppm
• Screw holes provided for easy mounting

Pin Connection

• Pin 1: “VCC” positive power supply (5V)
• Pin 2: “GND” ground
• Pin 3: “DO” TTL output
• Pin 4: “AO” Analogue output

 Datasheets

• MQ2 Hanwei Datasheet