### Project 16 Analog Alcohol Sensor

![](media/image-20251125112626638.png)

**1.Introduction**
This analog gas sensor - MQ3 is suitable for detecting alcohol. It can be used in a Breath analyzer. Also it has high sensitivity to alcohol and low sensitivity to Benzine. The sensitivity can be adjusted by the 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**

![](media/image-20251125174820283.png)

**4.Sample Code**

```c
//Arduino 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);
}
```