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Common Gas Sensor Module Kit w/ MQ-2 / MQ-3 / MQ-7 for Arduino
This is a commonly used gas sensor module kit that contains the most popular smoke sensor MQ-2£¬ an alcohol sensor MQ3 and a carbon monoxide sensor. MQ-2: - Type: Smoke Sensor - Detection Target: Liquefied petroleum gas£¬ natural gas£¬ coal gas£¬ smoke - Effect: it can be used to detect smoke or combustible gas concentration£¬ applied alarms - Operating voltage: 5V - Analog output AO: the higher the concentration of combustible gas£¬ the higher the output voltage - Digital output DO: Adjustable concentration alarms by potentiometer£¬ when the concentration exceeds the threshold you set£¬ it outputs low level£¬ otherwise high level output£¬ and it can be connected to microcontroller or relay modules. MQ-3: - Type: Alcohol Sensor - Detection Target: alcohol - Effect: it can be used to detect the concentration of ethanol vapor£¬ used in police alcohol measuring device - Operating voltage: 5V - Analog output AO: Adjustable concentration alarms by potentiometer£¬ when the concentration exceeds the threshold you set£¬ it outputs low level£¬ otherwise high level output£¬ and it can be connected to microcontroller or relay modules. MQ-7: - Type: Carbon Monoxide Sensor - Detection Target: carbon monoxide or other gases containing carbon monoxide - Function: used to detect the concentration of carbon monoxide£¬ it can be applied to coal gas poisoning alarm device - Operating voltage: 5V - Analog output AO: the higher the concentration of carbon monoxide£¬ the higher the output voltage - Digital output DO: Adjustable concentration alarms by potentiometer£¬ when the concentration exceeds the threshold you set£¬ it outputs low level£¬ otherwise high level output£¬ and it can be connected to microcontroller or relay modules.