GAS SENSOR MODULE KIT 9 IN 1 This gas sensor module kit 9-in-1 is perfect to test for the presence of a large variety of gasses. All the modules are compatible with Arduino. MQ-2 smoke gas sensors MQ-3 alcohol sensor MQ-4 methane sensor MQ-5 liquefied gas natural gas city gas sensor MQ-6 isobutane propane sensor MQ-7 carbon monoxide sensor module MQ-8 hydrogen sensor MQ-9 carbon monoxide combustible gas sensor MQ-135 air quality detection sensor PRODUCT DETAILS VCC: positive power supply (5V) GND: power supply is negative DO: TTL switching signal output AO: analog signal output
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