Overview

This MQ-3 sensor is suitable for detecting alcohol concentration on your breath, just like your common breathalyzer. It has a high sensitivity and fast response time. Sensor provides an analog resistive output based on alcohol concentration.

Features

• Sensitive for : Alcohol

• Main Chip : LM393, MQ-3 Sensor

• Operating Voltage : DC3.3V ~ 5V

• Analog output : 0 ~ 5V when input voltage is 5V

Pin Definition

• VCC : connect to DC3.3 or 5V.

• GND : connect to GND.

• DO : Digital output, 'H' or 'L'.

• AO : Analog output, the higher the concentration, the higher the voltage.