MQ6 - LPG Domestic Gas Sensor Module

The MQ6 Gas Sensor Module is specifically designed to detect LPG (Liquefied Petroleum Gas), butane, propane, and to some extent, methane and hydrogen. It's commonly used in gas leak detection systems and safety alarms.

This sensor contains a sensing element, mainly aluminum-oxide based ceramic, coated with Tin dioxide, enclosed in a stainless-steel mesh.

Technical Specifications:

• Operating Voltage: 5V DC
  
• Analog Output (A0): Varies based on gas concentration
  
• Digital Output (D0): HIGH or LOW depending on threshold (adjustable)
  
• Gas Detected: LPG, butane, propane, methane, hydrogen
  
• Detection Range: 300 – 10,000 ppm (gas concentration)
  
• Preheat Time: 20 seconds to a few minutes for stable readings

Pinouts:

Connection with Arduino:

Sample code:

Analog reading:

int mq6Pin = A0;  // MQ6 analog output connected to Arduino A0

void setup() {
  Serial.begin(9600);  // Start Serial Monitor
}

void loop() {
  int sensorValue = analogRead(mq6Pin);  // Read gas sensor value
  Serial.print("LPG Gas Level: ");
  Serial.println(sensorValue);           // Display in Serial Monitor
  delay(1000);  // Wait 1 second
}

Buzzer Alert (Gas Detected)

int mq6Pin = A0;
int buzzerPin = 8;
int gasThreshold = 400;  // Adjust based on your environment/testing

void setup() {
  Serial.begin(9600);
  pinMode(buzzerPin, OUTPUT);
}

void loop() {
  int gasLevel = analogRead(mq6Pin);
  Serial.print("Gas Level: ");
  Serial.println(gasLevel);

  if (gasLevel > gasThreshold) {
    digitalWrite(buzzerPin, HIGH);  // Sound buzzer
  } else {
    digitalWrite(buzzerPin, LOW);   // Buzzer off
  }
  delay(500);
}