The MQ-3 Alcohol Gas Sensor Module is designed to detect the presence of alcohol vapors in the air. It is widely used in breathalyzer devices, alcohol detection systems, and safety monitoring applications.
The module provides both analog and digital outputs, making it easy to interface with microcontrollers such as Arduino, ESP8266, and ESP32. It features an onboard comparator and adjustable sensitivity to control detection levels.
This sensor is commonly used in DIY electronics, IoT systems, and educational projects where alcohol detection is required.
Key Features
Detects alcohol gas in the air
High sensitivity to ethanol vapor
Adjustable detection sensitivity
Analog and digital output signals
Onboard LED indicator
Easy interface with microcontrollers
Technical Specifications
Parameter
Value
Sensor Type
MQ-3 Alcohol Sensor
Operating Voltage
5V
Detection Gas
Alcohol (Ethanol)
Output Type
Analog and Digital
Comparator IC
LM393
Preheat Time
~20 seconds
Interface Pins
VCC, GND, DO, AO
Pin Configuration
Pin
Description
VCC
Power Supply (5V)
GND
Ground
DO
Digital Output
AO
Analog Output
What’s in the Box
1 × MQ-3 Alcohol Gas Sensor Module
Weight
0.006 kg
Dimensions
3.2 × 2.0 × 2.2 cm
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