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MQ-8 Hydrogen Gas Sensor Module H2 Alarm DetectionFeatures-Using the high-quality dual-panel design, with power indicator and TTL signal output instructions.The switching signal having a DO (TTL) output and analog output AO.TTL output valid signal is low. ( Low-level signal when the output light can..

MQ-5 Methane LPG Liquid Propane Gas Sensor ModuleFeatures-High sensitivity to LPG, natural gas, town gas.Small sensitivity to alcohol, smoke.Stable and long life.Simple drive circuit.Fast response. ..

MQ-4 High Sensitivity Gas Methane (CNG) Detector Sensor ModuleFeatures-Signal output indicatorDual Signals output (analog output and TTL output)The TTL output signal is low level, allows to connect with SCM directlyAnalog output 0~5V voltageHigh sensitivity..

MQ-9 Carbon Monoxide, Methane, and LPG Gas Sensor ModuleFeatures-Good sensitivity to CO/Combustible GasHigh sensitivity to Methane, Propane, and COLong life and low costSimple drive circuit..