• Alcohol Detector
• Size: approx. 32 x 22 x 27mm
• Main chip: LM393, ZYMQ-3 gas detector
• Working Voltage: DC 5V
• Analog output 0 ~ 5v voltage, the higher the concentration, the higher the voltage

• VCC: positive power supply (5V)
• GND: power supply is negative
• DO: TTL switching signal output
• AO: analog signal output

More detailed information & instructions on MQ Gas Sensors is available at the Arduino Playground: https://playground.arduino.cc/Main/MQGasSensors

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• MQ-3 Alcohol Sensor Tutorial: Ethanol Detection, Breath Alcohol Principles, and Arduino Usage
  This tutorial is a comprehensive, practical guide to the MQ-3 Alcohol Gas Sensor Module (Leobot Product #515). It explains in detail what the MQ-3 sensor detects, how the sensing element works, its limitations, and how to use both the analog and digital outputs with Arduino for alcohol detection, demonstrations, and experimental breath-alcohol projects.