What you need to know before starting your first project
Your 10 First Projects (Hero / UNO R3)
The 37 in 1 Sensor Kit
Learning Components
Your First 10 Projects With The Arduino/HERO Simulator
Code Like A Wizard
Wizard Coding

Analog Alcohol Sensor

Learn how to make a breathalyzer with this tutorial. The alcohol sensor used has both analog and digital outputs and it has a high sensitivity to alcohol and low sensitivity to benzine. The supply voltage is +5V.

By turning LEDs on and off, Arduino is indicating the level of alcohol detected.