Gas Leak Detector with ESP32 & SIM800L | SMS Alert + LCD Display + Buzzer Warning
Build a real-time IoT Gas Leak Detection System using ESP32, MQ2 Gas Sensor, SIM800L GSM module, and I2C LCD display with buzzer warning. This project automatically detects gas leaks, displays live data on an LCD, sounds a buzzer like a real warning alarm, and sends an SMS alert to your phone.
In this Bangla tutorial, you'll learn:
✅ How to read MQ2 gas values on ESP32
✅ Show gas level with live bar graph on LCD
✅ Trigger buzzer alert in warning pattern
✅ Send SMS using SIM800L GSM module
✅ Prevent repeated SMS spam with a smart flag
✅ Display network signal, operator, and alert messages on LCD
📦 Components Used:
ESP32 Dev Board
MQ2 Gas Sensor
SIM800L GSM Module
I2C LCD 16x2
Buzzer
Jumper Wires, Breadboard
🔧 Bonus Features:
Smart SMS logic to avoid spamming
LCD shows “Sending SMS…” during alert
Signal strength & operator name display
Real-time gas level bar animation
💡 Use this system in kitchens, factories, or safety automation.
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