This module is made using Alcohol Gas Sensor MQ3. It is a low cost semiconductor sensor which can detect the presence of alcohol gases at concentrations from 0.05 mg/L to 10 mg/L. The sensitive material used for this sensor is SnO2, whose conductivity is lower in clean air. It’s conductivity increases as the concentration of alcohol gases increases. It has high sensitivity to alcohol and has a good resistance to disturbances due to smoke, vapor and gasoline. This module provides both digital and analog outputs. Threshold level for digital output can be easily adjusted using the preset on the board. MQ3 alcohol sensor module can be easily interfaced with Microcontrollers, ArduinoBoards, Raspberry Pi etc.

Features

• Low Cost
• Fast Response
• Stable and Long Life
• Good Sensitivity to Alcohol Gas
• Both Digital and Analog Outputs
• On-board LED Indicator

Technical Data

• Concentration : 0.05 mg/L ~ 10 mg/L Alcohol
• Operating Voltage : 5V ±0.1
• Current Consumption : 150mA
• Operation Temperature : -10°C ~ 70°C

Pin Out

• VCC – Input Power Supply
• GND – Supply Ground
• DO – Digital Output
• AO – Analog Output

Applications

• Vehicle Alcohol Detector
• Portable Alcohol Detector