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
