MQ-3 Alcohol Sensor Module

Description

MQ-3 Alcohol Sensor Module is one of the most commonly used sensors in the MQ sensor series. It is a Metal Oxide Semiconductor (MOS) type of sensor. Metal oxide sensors are also known as Chemiresistors, because sensing is based on the change of resistance of the sensing material when exposed to alcohol. So by placing it in a simple voltage divider network, alcohol concentrations can be detected.

MQ-3 Alcohol Sensor Modules 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. MQ3 alcohol sensor module can be easily interfaced with Microcontrollers, Arduino Boards, Raspberry Pi etc.

Features

• 5V operation
• Simple to use
• LEDs for output and power
• Output sensitivity adjustable
• Analog output 0V to 5V
• Digital output 0V or 5V
• 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

For more information on how to interface the module with Arduino, you can read this post.

You can download MQ-3 Alcohol Sensor Module datasheet here.