DIY Breathalyzer

DIY BAC sensor and display

October 1, 2015

After making a fun video for SparkFun to showcase the MQ-3 alcohol sensor, I created a simpler version of the breathalyzer used in the video. Using an Arduino, the MQ-3, and a 7-segment LED display, I made a BAC display. We put the project up at a friend’s Oktoberfest party as a fun toy (and as a way for people to read their BAC before driving home).

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