The project shows you how to build simple breathalyzer, an alcohol meter device for estimating blood alcohol content (BAC) from a breath sample. With this information, the application is able to determine if you may drive or not.
The project use MQ-3 as Alcohol Gas Sensor. The sensor composed by micro AL2O3 ceramic tube, Tin Dioxide (SnO2) sensitive layer, measuring electrode and heater are fixed into a crust made by plastic and stainless steel net. It has high sensitivity to alcohol and small sensitivity to Benzine and also Fast response and High sensitivity.
This simple breathalyzer project is built around Arduino board. To acquire data, the system use ADC input which is connected to sensor. When Alcohol Gas amount in breath is detected, the sensor output voltage will be changed. The Arduino will process this information and control 10 LEDs as indicator. This simple Arduino Breathalyzer is designed by Daniel Andrade.