Smart LPG Gas Leakage Detection Project using Arduino [2025]: LPG Leakage Detector

IoT-based LPG Gas Leakage Detection Project using Arduino [Step-by-Step Guide]

LPG (Liquified Petroleum Gas) is a commonly used fuel source for households, restaurants, hotels, and industries due to its affordability, clean-burning nature, and ease of use. However, it’s also highly flammable, making gas leak detection a critical safety necessity.

Gas leaks can result from faulty valves, poor pipe connections, or human negligence. If undetected, such leaks can cause massive fires, explosions, or poisoning—especially when confined to closed spaces.

To address this, we present an IoT-based LPG gas leakage detection system using Arduino, integrated with an MQ5 gas sensor, Wi-Fi connectivity, and alerting systems such as buzzer, LED, and real-time notifications

Project Overview: What This System Does

• Uses MQ5 Gas Sensor to continuously detect LPG in the surrounding air.

• Sends real-time data to an Arduino microcontroller.

• If dangerous gas levels are detected:

  • RGB LED glows red.

  • A buzzer is activated.

  • A message is displayed on the LCD screen.

  • A notification is sent via the Wi-Fi module to the user’s IoT dashboard.

  • A solenoid valve is triggered to shut off the gas supply automatically.

Block Diagram: IoT Gas leakage detector using Arduino

Image Credit: nevonprojects

Required Components

Working Principle of the Project

Step-by-Step Process

1. Startup: The Arduino initializes all components including the Wi-Fi module, MQ5 sensor, LCD, buzzer, and RGB LED.

2. Monitoring: The MQ5 sensor continuously measures the concentration of LPG in the air.

3. Detection: If gas levels cross a threshold:

   • The buzzer activates.

   • The LCD shows “Leakage Detected!“

   • The RGB LED glows red.

   • The solenoid valve shuts the gas supply.

   • The Wi-Fi module sends a real-time alert.

4. Safe Condition: If levels are normal, the RGB LED glows green and no alerts are triggered.

Arduino Code Snippet (MQ5 Sensor + LCD + Wi-Fi)

#include <LiquidCrystal.h>
int gasSensor = A0;
int buzzer = 8;
int redLED = 7;
int greenLED = 6;
int gasValue = 0;

LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

void setup() {
pinMode(gasSensor, INPUT);
pinMode(buzzer, OUTPUT);
pinMode(redLED, OUTPUT);
pinMode(greenLED, OUTPUT);
lcd.begin(16, 2);
Serial.begin(9600); // for WiFi module
}

void loop() {
gasValue = analogRead(gasSensor);
Serial.println(gasValue);

if (gasValue > 300) {
digitalWrite(buzzer, HIGH);
digitalWrite(redLED, HIGH);
digitalWrite(greenLED, LOW);
lcd.setCursor(0, 0);
lcd.print(“Gas Leakage!”);
Serial.println(“Alert: Gas Detected”);
} else {
digitalWrite(buzzer, LOW);
digitalWrite(redLED, LOW);
digitalWrite(greenLED, HIGH);
lcd.setCursor(0, 0);
lcd.print(“Gas Level: Safe “);
}

delay(500);
}

Image credit: arduino.cc

Advantages of This IoT Gas Leakage Detection Project

• Real-time gas monitoring

• Automated alert and safety response

• Remote monitoring via Internet (IoT-enabled)

• Increases safety for homes and industries

• Low power and easy to maintain

Limitations

• Requires reliable internet for alerts

• Needs electricity or battery power

• Might need calibration for different environments

• Requires regular maintenance

Applications of LPG leakage detector Project

• Households – Kitchen safety

• Industries – Manufacturing units with gas usage

• Restaurants & Hotels

• LPG Storage Warehouses

• Laboratories

• Safety Training Facilities

Related Projects to Explore

1. Smart Doorbell Security System using IoT
2. Automatic Traffic Light Controller using Arduino: Traffic light Control System project
3. Smart Table Lamp Project using Arduino: DIY IoT Project

Let us know what you know more about IoT based Gas Leakage Detection system using Arduino in the comment section below.