Abstract
In a series of breathalyzer measures the amount of alcohol per liter of alveolar air, which is air from the lungs. The project aims to develop a breathalyzer, using the gas sensor MQ-3, an Arduino Uno microcontroller, one liquid crystal display and a Bluetooth module. For each concentration of alcohol sensor determines a value displayed on the Arduino Uno Serial Port 'COM3' with a range from 0 to 1023, this corresponds to variation of the output voltage ranging from 0 to 5 volt circuit for each concentration. The concentration is measured and displayed on the LCD in a mobile phone through an application, the determination of the concentration present in the air. Resumo — Present a clear and objective manner, the steps for making the breathalyzer (breath), capable of issuing measured values for cell via Bluetooth. At first we will see the introduction basics of the instrument, its usefulness and electronic components that comprise it. Then there will be an account of the methodology and finally present the results obtained.Index Terms — Breathalyzer, Bluetooth technology.
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