MQ3 Gas Sensor

The MQ3 Alcohol Gas Sensor Module is a versatile gas sensing device based on the MQ3 sensor, which uses a tin dioxide (SnO2) semiconductor layer. It is highly sensitive to alcohol gases (ethanol) and has a smaller sensitivity to benzine and other gases. This module is widely used in portable alcohol detectors, breathalyzers, and industrial safety monitoring systems. It features a simple analog output that varies with gas concentration and a digital output with a comparator for threshold-based alerts. The sensor operates at 5V and offers a fast response time and long-term stability. Its compact design and easy interface make it a top choice for hobbyists, students, and professionals working on safety and IoT projects. Choose this module for reliable alcohol detection in your electronic applications.