Arduino program to interface gas sensor to detect the gas

Interfacing a gas sensor with an Arduino is straightforward. In this example, we'll use the MQ-2 gas sensor, which can detect various gases like LPG, methane, and smoke. The sensor outputs an analog signal corresponding to the gas concentration.

Components Needed:

Arduino board (e.g., Uno)
MQ-2 gas sensor module
Breadboard and jumper wires

Circuit Connection:

Connect the VCC pin of the gas sensor to the 5V pin of the Arduino.
Connect the GND pin of the gas sensor to the GND pin of the Arduino.
Connect the A0 pin of the gas sensor to the A0 analog input pin of the Arduino.

Solution

void setup() 
{
  pinMode(10,  OUTPUT);
  pinMode(A5, INPUT);
  Serial.begin(9600);
}

void  loop() 
{
  int sensor_read = analogRead(A5);   
  if (sensor_read > 60)
  {
    
	Serial.print("Gas Sensor Value:");
    Serial.println(sensor_read);
    tone(10,500, 100); //piezo rings 
  }
  else
  {
    noTone(10); //peizo wont ring
  }
  delay(50);
}

Output

analogRead(gasSensorPin);: Reads the analog value from the gas sensor. The value ranges from 0 to 1023, corresponding to the gas concentration.

Serial.print("Gas Sensor Value: ");: Prints a label to the Serial Monitor.

Serial.println(sensorValue);: Prints the sensor value to the Serial Monitor on a new line

Programming Examples

Arduino program to interface gas sensor to detect the gas