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Characteristics:1, with signal output instructions;2, dual signal output (analog output and TTL level output);3, TTL output signal is low, can be directly connected to the microcontroller;4. Analog output 0~5V voltage, the higher the concentration, the higher the voltage;5. High sensitivity and good selectivity to ethanol vapor;6, has a long service life and reliable stability;7, rapid response recovery characteristics;Module Features:size: 32mm X22mm X22mm length * width * heightMain chip: LM393, MQ-3 gas sensorWorking voltage: DC3-5VApplication:It is used for on-the-spot testing of motor vehicle drivers and other non-drinking workers. It is also used for the detection of ethanol vapor in other locations. The scope of detection is alcohol: the detection range is 10 to 1000 ppm.Electrical Parameters:Input Voltage: DC5V Power Consumption (Current): 150mADO output: TTL digital quantities 0 and 1 (0.1 and 5V)AO output: 0.1-0.3V (relatively no pollution), the highest concentration voltage is about 4VPackage Include:1X MQ-3 Sensor Module