Shawn hymel
Published © MIT

DIY Breathalyzer

Use an MQ-3 alcohol sensor as a breathalyzer and display the user's BAC.

IntermediateFull instructions provided12,202
DIY Breathalyzer

Things used in this project

Hardware components

SparkFun RedBoard
SparkFun RedBoard
×1
SparkFun OpenSegment Shield
×1
7-Segment Display - 20mm (Blue)
×1
Wall Charger - 5V USB (1A)
×1
USB Mini-B Cable - 6 Foot
×1
Alcohol Gas Sensor - MQ-3
×1
SparkFun Gas Sensor Breakout Board
×1
Break Away Headers - Straight
×1
Hook-up Wire - White (22 AWG)
×1
ProtoBoard - Square 1" Single Sided
×1
Arduino Stackable Header Kit
×1
Resistor 4.7k Ω
×1

Hand tools and fabrication machines

Soldering Station
Solder

Story

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Schematics

DIY Breathalyzer

Diy breathalyzer

Code

DIY_Breathalyzer

Download ZIP and upload BAC_Display.ino to the Arduino!

Credits

Shawn hymel

Shawn hymel

10 projects • 64 followers
Engineering Superhero at SparkFun Electronics.
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