MQ-2 gas sensor module has high sensitive 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. Working voltage: DC 5V, DOUT: TTL output, AOUT: Analog output, Preheat time: Over 20s.
MQ-3 Gas Sensor module, sensitive to Alcohol, Ethanol concentrations. Output is proportional to concetration of Alcohol / Ethanol. Working voltage: DC 5V, DOUT: TTL output, AOUT: Analog output, Preheat time: Over 20s.
MQ-7 - MQ7 Gas Sensor module, sensitive to Carbon Monoxide. Output is proportional to concetration of Carbon Monoxide. Working voltage: DC 5V, DOUT: TTL output, AOUT: Analog output, Preheat time: Over 20s.
