Sensitive material of MQ-2 gas sensor is SnO2, which with lower conductivity in clean air. When the target combustible gas exist, the sensor’s conductivity is higher along with the gas concentration rising. Please use simple electro circuit, Convert change of conductivity to correspond output signal of gas concentration. MQ-2 gas sensor has high sensitivity to LPG, Propane and Hydrogen, also could be used to Methane and other combustible steam, it is with low cost and suitable for different application.

Features:
•    Operating Voltage is +5V
•    Can be used to Measure or detect LPG, Alcohol, Propane, Hydrogen, CO and even methane
•    Analog output voltage: 0V to 5V
•    Digital Output Voltage: 0V or 5V (TTL Logic)
•    Preheat duration 20 seconds
•    Can be used as a Digital or analog sensor
•    The Sensitivity of Digital pin can be varied using the potentiometer