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.
DIY Breathalyzer Using Arduino UNO and 128X64 LCD - elab | Rik
Breathalyzer With Arduino : 7 Steps (with Pictures) - Instructables
Alcoholimeter with MQ3 sensor and arduino nano (Includes printed circuit) - Share Project - PCBWay