Introduction

This experiment uses the MQ-4 gas sensor to detect gasoline fumes in the air.

Components Needed

• MQ-4 Gas Sensor
• Arduino
• Jumper Wires

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Circuit Setup

1. Connect the VCC pin of the MQ-4 sensor to 5V on the Arduino.
2. Connect the sensor’s output to an analog input pin (e.g., A0) on the Arduino.

The sensor will output a signal proportional to the concentration of gasoline fumes detected.

Code for Gasoline Fume Detection

Upload the following code to your Arduino to detect gasoline fumes:

const int mq4Pin = A0;

void setup() {
  Serial.begin(9600);
}

void loop() {
  int gasValue = analogRead(mq4Pin);
  Serial.print("Gasoline Fumes Level: ");
  Serial.println(gasValue);
  delay(1000);
}
            

Explanation

The MQ-4 sensor detects the concentration of gases such as methane and gasoline in the air and converts it into an analog voltage signal.

Troubleshooting

• If the sensor is not responding, check the sensor’s connections and power supply.
• Ensure the sensor is exposed to fumes or gases in a controlled environment.