Gas Sensors

Want to build your own breathalyzer? This variety of semiconductor gas sensors makes it possible to measure concentrations of gasses such as alcohol, methane, propane, butane, and carbon monoxide.

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Pololu Carbon Monoxide & Flammable Gas Sensor MQ-9 This semiconductor gas sensor detects the presence of Carbon Monoxide at concentrations from 10 to 1,000 ppm and combustible gas from 100 to 10,000 ppm. TS-056-MQ9 $5.95 12 Ready to Ship!	Pololu Carbon Monoxide Gas Sensor MQ-7 This semiconductor gas sensor detects the presence of Carbon Monoxide at concentrations from 10 to 10,000 ppm. The sensor’s simple analog voltage interface requires only one analog input pin from your microcontroller. TS-056-MQ7 $4.95 13 Ready to Ship!
Pololu LPG / Isobutane / Propane Gas Sensor MQ-6 This semiconductor gas sensor detects the presence of LPG, isobutane, and propane at concentrations from 300 to 10,000 ppm. The sensor’s simple analog voltage interface requires only one analog input pin from your microcontroller. TS-056-MQ6 $4.95 13 Ready to Ship!	Pololu Methane Gas Sensor MQ-4 This semiconductor gas sensor detects the presence of methane (CNG) gas at concentrations from 300 ppm to 10,000 ppm, a range suitable for detecting gas leaks. TS-056-MQ4 $4.95 8 Ready to Ship!
Pololu Alcohol Gas Sensor MQ-3 This semiconductor gas sensor detects the presence of alcohol gas at concentrations from 0.04 mg/L to 4 mg/L, a range suitable for making a breathalyzer. TS-056-MQ3 $4.49 10 Ready to Ship!	Pololu Flammable Gas & Smoke Sensor MQ-2 This semiconductor gas sensor detects the presence of combustible gas and smoke at concentrations from 300 to 10,000 ppm. The sensor's simple analog voltage interface requires only one analog input pin from your microcontroller. TS-056-MQ2 $3.95 8 Ready to Ship!
Pololu MQ Gas Sensor Carrier This carrier board is designed to work with any of the MQ-series "gas sensors". TS-056-MQ0 $0.95 39 Ready to Ship!	Humidity Sensor Carrier HIH-4030 This is a carrier board for the HIH-4030 relative humidity (%RH) sensor from Honeywell outputs an analog voltage that varies nearly linearly with humidity. TS-051-000 $16.95 8 Ready to Ship!

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