Alcohol Sensor MQ-3 Interfacing with Arduino

INTRODUCTION

The MQ-3 is an alcohol gas sensor that is available for about $5 from Sparkfun, Seeed Studio, and others. It’s easy to use and has sparked the imagination of anyone who has dreamed of building their own breathalyzer device for measuring the amount of alcohol in the human body.

HARDWARE REQUIRED

  1. ARDUINO UNO
  2. MQ-3 Alcohol Detector Sensor

ABOUT THE SENSOR

Description: This alcohol sensor is suitable for detecting alcohol concentration on your breath, just like your common breathalyzer. It has a high sensitivity and fast response time. Sensor provides an analog resistive output based on alcohol concentration. The drive circuit is very simple, all it needs is one resistor. A simple interface could be a 0-3.3V ADC.

Features:

  • 5V DC or AC circuit
  • Requires heater voltage
  • Operation Temperature: -10 to 70 degrees C
  • Heater consumption: less than 750mW

Dimensions:

  • 16.8mm diameter
  • 9.3 mm height without the pins

Documents:

PIN CONFIGURATION

MQ-3

SOFTWARE REQUIRED

  1. ARDUINO IDE

SCHEMATICS

 

WIRING

breathalyzerschematic

interface.png

NOTE: I prefer to use a breakout board or module instead direct attaching the sensor with Arduino.

 

HERE IS THE LINK : BUY ONE FOR YOUR PROJECT 

MQ3-alcohol-sensor-circuit-with-arduino.png

DOWNLOAD FULL SOURCE CODE AND OTHER FILES FROM HERE

 

HAPPY INTERFACING:)

TECEX

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