Gas Sensor MQ3 Sensitive Alcohol Gas for Breathalyzer – Perintang.com
Alcohol Level Meter Breathalyzer using Arduino & MQ-2/MQ-5/MQ-135 Sensor - YouTube
Arduino-Based Alcohol Detector
GitHub - oneguyoneblog/Arduino-breathalyzer-DIY-alcohol-tester-with-MQ-3-gas-sensor-and-OLED-display: This is the code I use for a simple olcohol detector or "breathalYzer", using an Arduino Uno, MQ-3 gas sensor, OLED display and a couple of LEDs.