Thirai - IoT Gas Leakage Detection System using ESP32 + MQ-2 Sensor

🔥 IoT Gas Leakage Detection System using ESP32

Overview

Gas leakage is one of the major safety concerns in homes and industries. This project uses an ESP32 microcontroller and MQ-2 gas sensor to detect harmful gas leaks such as LPG, methane, and smoke. The system can alert users instantly and can be extended with IoT features for remote monitoring.

Project Details

Controller
ESP32

Sensor
MQ-2 Gas Sensor

Output
Buzzer / LED

Level
Beginner to Intermediate

Components Required

• ESP32 Development Board
• MQ-2 Gas Sensor
• Buzzer
• LED Indicator
• Jumper Wires

Working Principle

The MQ-2 sensor detects gas concentration in the air. When the gas level exceeds a threshold, the ESP32 reads the signal and activates a buzzer or LED alert. This system can be enhanced with IoT notifications using Wi-Fi.

Connections

MQ-2 Sensor
VCC → 5V
GND → GND
OUT → GPIO 34

Buzzer
Positive → GPIO 25
Negative → GND

ESP32 Code

Arduino Code

#define GAS_SENSOR 34
#define BUZZER 25

void setup(){
  pinMode(GAS_SENSOR, INPUT);
  pinMode(BUZZER, OUTPUT);
  Serial.begin(9600);
}

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

  if(gasValue > 300){
    digitalWrite(BUZZER, HIGH);
  } else {
    digitalWrite(BUZZER, LOW);
  }

  delay(500);
}

Applications

• Home gas leakage safety system
• Industrial gas monitoring
• Smart IoT safety solutions
• Fire hazard detection

Conclusion

This project demonstrates a simple yet powerful safety system using ESP32. It can be extended to send alerts via mobile apps or integrated into smart home ecosystems.