Project 18 Analog Alcohol Sensor

1.Introduction

This analog gas sensor - MQ3 is suitable for detecting alcohol. It can be used in a Breath analyzer. It has good selectivity because it has higher sensitivity to alcohol and lower sensitivity to Benzine. The sensitivity can be adjusted by A potentiometer.

2.Specification

• Power supply: 5V

• Interface type: Analog

• Quick response and High sensitivity

• Simple drive circuit

• Stable and long service life

• Size: 49.7*20mm

• Weight: 6g

3.Connection Diagram

4.Sample Code

void setup()
{
   Serial.begin(9600); //Set serial baud rate to 9600 bps
}

void loop()
{
    int val;
    val=analogRead(0);//Read Gas value from analog 0
    Serial.println(val,DEC);//Print the value to serial port
    delay(100);
}