SIM800L-Based LPG Leak Detection and Emergency Alert System

Description:

The SIM800L-Based LPG Leak Detection and Emergency Alert System is a student safety innovation project built on a 40 × 50 cm foam board or sun board platform. This working model is designed to detect hazardous LPG gas leaks in real-time and instantly alert users via SMS using the SIM800L GSM module.

An LPG gas sensor continuously monitors the air for gas leaks. When a leak is detected, the system powered by Arduino UNO triggers a buzzer alert, activates an exhaust fan, displays a warning on a 16×2 LCD screen, and simultaneously sends a text message to a pre-set emergency contact through the GSM module. A servo motor can also simulate an automatic gas valve shut-off action for added safety.

🧰 Materials Used:

• Foam board / Sun board – for structural base (40 × 50 cm)
• Arduino UNO Microcontroller – central processor
• 16×2 LCD Module – to display gas status
• LPG Gas Sensor – detects gas leakage
• SIM800L GSM Module – sends SMS alerts
• Servo Motor – to simulate valve shut-off
• 2-Pin Push Button – for reset or manual override
• Buzzer – audio alert on detection
• LEDs (optional) – for visual alerts
• Gas Regulator – gas source simulation
• Exhaust Fan – to expel leaked gas
• Jumper Wires – internal connections
• Power Distribution Board – regulated power supply to components

⚙️ How It Works (Working Principle):

1. LPG sensor continuously checks gas concentration in the air.
2. Upon detection of a gas leak:
   • Buzzer sounds to alert occupants
   • LCD displays “Gas Leakage Detected!”
   • Servo motor simulates automatic valve closure
   • Exhaust fan turns on to disperse the gas
   • GSM module sends an SMS alert with a warning message

✅ Features:

• Real-time gas leak detection and response
• Instant SMS alert using SIM800L GSM module
• LCD-based display for monitoring
• Optional valve shut-off via servo
• Safety model ideal for homes, kitchens, and labs

🎯 Educational Value:

This model teaches students:

• Real-world use of sensors and GSM communication
• Basics of Arduino programming and automation
• How alert systems prevent industrial or domestic accidents
• Working of servo, LCD, and sensor integration