Alcohol Gas Sensor MQ-3


This alcohol sensor is suitable for detecting alcohol concentration on your breathjust 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 simpleall it needs is one resistor. A simple interface could be a 0-3.3V ADC.
Please review the datasheet for conversions to ppm then for BAC.


  • 16.8mm diameter
  • 9.3 mm height without the pins


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


Mikroelectron Code:

int sensorValue;

void setup()


  Serial.begin(9600); // sets the serial port to 9600


void loop()


  sensorValue = analogRead(0); // read analog input pin 0

  Serial.println(sensorValue, DEC); // prints the value read

  delay(100); // wait 100ms for next reading


2 JD
3 JD
In stock

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