The Automatic LPG Gas Detection and Alerting System is designed to detect Liquefied Petroleum Gas (LPG) leakage and provide timely alerts to prevent accidents and ensure safety. The system uses an LPG gas sensor connected to an Arduino Uno microcontroller to continuously monitor the concentration of LPG in the surrounding environment. Based on the detected gas level, the system provides three levels of indication using LEDs. During normal conditions, the green LED glows, indicating a safe environment. When a small amount of LPG leakage is detected, the yellow LED turns ON to provide a warning indication along with Buzzer. If the LPG concentration exceeds the predefined safety limit, the red LED glows and a buzzer is activated simultaneously to provide a high-alert warning. The proposed system offers a simple, reliable, and cost-effective solution for LPG leak detection in homes, restaurants, laboratories, and industrial environments. By providing real-time monitoring and immediate visual and audible alerts, the system helps prevent fire hazards, explosions, and health risks caused by LPG leakage, thereby enhancing overall safety and protection.      

Objectives:

  To detect LPG gas leakage in real time using a gas sensor.

  To provide a green LED indication during normal and safe conditions.

  To give a warning through a yellow LED and buzzer when a minor gas leak is detected.

  To activate a red LED and buzzer during high LPG concentration for immediate alert.

  To improve safety by preventing accidents caused by LPG gas leakage.

  To develop a low-cost and reliable gas monitoring and alerting system for domestic and industrial applications.          

The major building blocks of this project are:  

• Regulated Power Supply.
• MQ-2 Gas Sensor.
• Arduino UNO Micro controller.
• Buzzer.
• R Y B LED indicators.

        Software’s used:

1. Arduino IDE for compiling and dumping code into Microcontroller
2. Express SCH for Circuit design.

        Regulated Power Supply:

             

Block diagram:          

video: